User Manual
OA 5000 Series
Optical Attenuators
070-7612-06
www.tektronix.com
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WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and
workmanship for a period of one (1) year from the date of shipment. If a product proves defective during this
warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor,
or will provide a replacement in exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration
of the warranty period and make suitable arrangements for the performance of service. Customer shall be
responsible for packaging and shipping the defective product to the service center designated by Tektronix, with
shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a
location within the country in which the Tektronix service center is located. Customer shall be responsible for
paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage
resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product;
b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any
damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been
modified or integrated with other products when the effect of such modification or integration increases the time
or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS
OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’
RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR
THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
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EC Declaration of Conformity
We
Tektronix UK Ltd.
The Arena
Downshire Way
Bracknell, RG12 1PU
declare under sole responsibility that the
OA5000 Series Optical Attenuators
OA5002, OA5012, OA5022, and OA5032
Including the OCP5502 Power Module
meet the intent of Directive 89/336/EEC for Electromagnetic Compatibility and
Low Voltage Directive 73/23/EEC for Product Safety.
Compliance was demonstrated to the following specifications as listed in the Official
Journal of the European Communities:
EMC Directive 89/336/EEC:
EN 61326
EMC requirements for Class A electrical equipment for
measurement, control, and laboratory use
IEC 61000--4--2 Electrostatic Discharge Immunity
(Performance Criterion B)
IEC 61000--4--2 RF Electromagnetic Field Immunity
(Performance Criterion A)
IEC 61000--4--2 Electrical Fast Transient / Burst Immunity
(Performance Criterion B)
IEC 61000--4--2 Power Line Surge Immunity
(Performance Criterion B)
IEC 61000--4--2 RF Conducted Immunity
(Performance Criterion A)
IEC 61000--4--2 Power Line Voltage Fluctuation Immunity
(Performance Criterion B)
EN 61000--3--2
AC Power Line Harmonic Emissions
This product meets the essential requirements in Annes 1 of the
Low Voltage Directive 73/23/EEC, amended by 93/68/EEC:
EN 61010--1/A1
Safety requirements for electrical equipment for
measurement, control, and laboratory use
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Welcome
Congratulations on your purchase of an OA 5000 Series Optical Attenuator.
The OA 5000 Series Optical Attenuators are high-performance instruments
used to attenuate optical signals. The OA 5000 Series consists of four instru-
ments, the OA 5002, OA 5012, OA 5022, and OA 5032. The major difference
between the models is the optical fiber connection. The OA 5002 is used
with single-mode fiber; the OA 5012, with 50 ꢀm multimode fiber; the
OA 5022, with 62.5 ꢀm multimode fiber; and the OA 5032, with 100 ꢀm fiber.
Some of the outstanding characteristics of the OA 5000 Series are:
H
Attenuation to 60 dB — the OA 5000 can attenuate signals up to 60 dB
in steps of 0.01 dB. A shutter provides greater than 100 dB attenuation
for the OA 5002, OA 5012, and OA 5022. The shutter provides greater
than 90 dB attenuation for the OA 5032.
H
H
H
600 nm to 1700 nm calibrated spectral response in one unit.
Linear response within 0.05 dB.
Ability to store attenuation levels, which is useful for repeat measure-
ments.
H
H
GPIB Programmable — the OA 5000 Series conforms to IEEE Std 488.2.
Models for both Single and Multimode Fiber.
OA 5000 Series User Manual
i
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ii
Welcome
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Contents
Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
i
iii
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vii
viii
ix
A Quick Tour
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the OA 5000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
1-2
A Quick Tour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preset the OA 5000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storing and Recalling Settings . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting a Reference Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3
1-3
1-4
1-5
User Reference
Operator Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The User Reference Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1
2-1
Enabling/Disabling Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3
Setting Attenuation Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifying the Wavelength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Attenuation Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Attenuation Level to Minimum . . . . . . . . . . . . . . . . .
2-5
2-5
2-6
2-7
Setting the GPIB Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-9
Setting the Reference Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measuring Insertion Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Approximating Signal Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-11
2-12
2-13
Storing and Recalling
Attenuation Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-15
OA 5000 Series User Manual
iii
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Programming
Setting Up the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1
Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the GPIB Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1
3-1
Command Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clearing the OA 5000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command and Query Structure . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Argument Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Syntax Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5
3-5
3-6
3-8
3-10
3-11
Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-13
Common Commands and Queries . . . . . . . . . . . . . . . . . . . . . . . .
Device Commands and Queries . . . . . . . . . . . . . . . . . . . . . . . . . .
ADJusting? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ALLev? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ATTenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BLRN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*CAL? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*CLS (No Query Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DESE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DISable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DISPlay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*ESE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*ESR? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVEnt? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVMSG? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVQty? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FACTORY (No Query Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HEADer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*IDN? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*LRN? or SET? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*OPC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*PSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RECall (No Query Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REFerence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*RST (No Query Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*SRE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*STB? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STORe (Store Attenuation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*TST? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VERBOSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*WAI (No Query Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WAVelength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-13
3-14
3-15
3-15
3-16
3-17
3-18
3-18
3-19
3-20
3-20
3-21
3-22
3-22
3-23
3-23
3-24
3-25
3-26
3-26
3-27
3-27
3-28
3-29
3-29
3-30
3-31
3-31
3-32
3-33
3-34
3-34
iv
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Status and Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-35
Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Queues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Event Handling Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conflicts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-35
3-39
3-39
3-40
3-41
Appendices
Appendix A: Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-1
A-1
A-1
Appendix B: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-3
Appendix C: Interface Specifications . . . . . . . . . . . . . . . . . . . . . . . . .
Interface Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Character Set (ASCII Chart) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIB Function Subsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-7
A-7
A-8
A-9
Appendix D: Using the *OPC Query/Command . . . . . . . . . . . . . . . .
Appendix E: Packing for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-11
A-13
Appendix F: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning the Optical Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing the Optical Port Connectors . . . . . . . . . . . . . . . . . . . .
A-15
A-15
A-17
Appendix G: Product Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-21
Equipment List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIB Address Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attenuation Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shutter Attenuation and the DISABLE button . . . . . . . . . . . . . .
A-21
A-22
A-23
A-24
A-24
A-25
1310 nm: Insertion Loss, Attenuation Accuracy, and
Repeatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-26
A-28
A-29
1550 nm: Insertion Loss, Attenuation Accuracy, and
Repeatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
850 nm (except A5002): Insertion Loss, Attenuation
Accuracy, and Repeatability . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix H: Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List . . . . . . . . . . . . . . . . . . . . . . . . .
A-31
A-31
A-31
OA 5000 Series User Manual
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Index
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I-1
vi
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List of Figures
Figure 1-1: Installing the OA 5000 into the Power Module . . . . . . . . .
1-2
1-4
Figure 1-2: OA 5002 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-1: OA 5002 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-2: The Location of the DISABLE Button . . . . . . . . . . . . . . . .
Figure 2-3: Setting Attenuation Levels . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-4: The Location of the ADDR (SET) Button . . . . . . . . . . . . . .
Figure 2-5: The Location of the SET REF Button . . . . . . . . . . . . . . . . .
Figure 2-6: The Location of the STORE and RECALL Buttons . . . . .
Figure 3-1: GPIB Connector Location . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-2: Typical GPIB Network Configurations . . . . . . . . . . . . . . . .
Figure 3-3: Command Message Elements . . . . . . . . . . . . . . . . . . . . . .
Figure 3-4: Block Argument Example . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-5: Typical Syntax Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-6: The Standard Event Status Register (SESR) . . . . . . . . . .
Figure 3-7: The Status Byte Register (SBR) . . . . . . . . . . . . . . . . . . . . .
Figure 3-8: The Device Event Status Enable Register (DESER) . . . .
Figure 3-9: The Event Status Enable Register (ESER) . . . . . . . . . . . .
Figure 3-10: The Service Request Enable Register (SRER) . . . . . . .
Figure 3-11: Status and Event Handling Process . . . . . . . . . . . . . . . .
Figure A-1: Removing the Optical Bulkhead Connector . . . . . . . . . .
Figure A-2: FC Optical Bulkhead Assembly . . . . . . . . . . . . . . . . . . . . .
Figure A-3: ST Optical Bulkhead Assembly . . . . . . . . . . . . . . . . . . . . .
Figure A-4: DIN 47256 Optical Bulkhead Assembly . . . . . . . . . . . . . .
Figure A-5: SC Optical Bulkhead Assembly . . . . . . . . . . . . . . . . . . . . .
Figure A-6: OA 5000 Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . .
2-2
2-3
2-5
2-9
2-11
2-15
3-2
3-2
3-6
3-10
3-11
3-35
3-36
3-37
3-38
3-38
3-40
A-16
A-17
A-18
A-18
A-19
A-33
OA 5000 Series User Manual
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List of Tables
Table 3-1: BNF Symbols and Meanings . . . . . . . . . . . . . . . . . . . . . . . .
3-5
3-6
3-7
Table 3-2: Command Message Elements . . . . . . . . . . . . . . . . . . . . . .
Table 3-3: Comparison of Header On and Off Responses . . . . . . . . .
Table 3-4: Commands Common to All GPIB Devices and
Supported by the OA 5000 Series . . . . . . . . . . . . . . . . . . . . . . . . .
3-13
3-14
3-24
3-32
3-36
3-37
3-41
3-41
3-42
3-43
3-43
3-43
A-3
Table 3-5: OA 5000 Device Commands and Parameters . . . . . . . . .
Table 3-6: FACTORY Front Panel Settings . . . . . . . . . . . . . . . . . . . . . .
Table 3-7: Results from *TST? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3-8: SESR Bit Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3-9: SBR Bit Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3-10: No Event Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3-11: Command Error Messages — CME Bit 5 . . . . . . . . . . . .
Table 3-12: Execution Error Messages — EXE Bit 4 . . . . . . . . . . . . .
Table 3-13: Device Error Messages — DDE Bit 3 . . . . . . . . . . . . . . . .
Table 3-14: System Event Messages — QYE Bit 2 . . . . . . . . . . . . . . .
Table 3-15: Execution Warning Messages — EXE Bit 4 . . . . . . . . . .
Table A-1: Optical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A-2: Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A-3: Environmental Performance . . . . . . . . . . . . . . . . . . . . . . . .
Table A-4: OA 5000 Standard Interface Messages . . . . . . . . . . . . . .
Table A-5: The ASCII Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4-1: Equipment Required for Performance Verification . . . . . .
Table 4-2: Attenuation Accuracy at 1310 nm . . . . . . . . . . . . . . . . . . . .
Table 4-3: Attenuation Accuracy at 1550 nm . . . . . . . . . . . . . . . . . . . .
Table 4-4: Attenuation Accuracy at 850 nm . . . . . . . . . . . . . . . . . . . . .
A-4
A-4
A-7
A-8
A-21
A-27
A-29
A-30
viii
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Safety
You might be eager to begin using your OA 5000, but please take a moment
to review these safety precautions. They are provided for your protection
and to prevent damage to the Optical Attenuator. This safety information
applies to all operators and service personnel.
These two terms appear in manuals:
Symbols and Terms
H
H
statements identify conditions or practices that could result in
damage to the equipment or other property.
statements identify conditions or practices that could result in
personal injury or loss of life.
These two terms appear on equipment:
H
CAUTION indicates a personal injury hazard not immediately accessible
as one reads the marking, or a hazard to property including the equip-
ment itself.
H
DANGER indicates a personal injury hazard immediately accessible as
one reads the marking.
This symbol appears in manuals:
Static-Sensitive Devices
These symbols appear on equipment:
DANGER
Protective
ATTENTION
Refer to
High Voltage
ground (earth)
terminal
manual
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Observe all of these precautions to ensure your personal safety and to
prevent damage to either the OA 5000 or equipment connected to it.
Specific Precautions
Optical Output
WARNING
To prevent damage to your eyes, avoid looking into the optical
output port while there is an optical signal connected to the input
port. Even if the OA 5000 is switched off, light can pass through the
attenuator. Always attach the output port to a receiver before attach-
ing the source signal to the input port.
Power Source
The OA 5000 is designed for operation in a Tektronix TM 5000 Series Power
Module or the right-hand slot of an Tektronix OCP 5502. To ensure safe
operation, follow all precautions listed in the instrument’s Operators Manual.
Do not attempt to operate the OA 5000 with any other power source.
Grounding the Optical Attenuator
The OA 5000 is grounded through the power module. To avoid electric
shock, plug the power module power cord into a properly wired receptacle
where earth ground has been verified by a qualified service person.
Without the protective ground connection, all parts of the OA 5000 are
potential shock hazards. This includes knobs and controls that may appear
to be insulators.
Use the Proper Power Cord
Use only the power cord and connector specified for your TM 5000 Series
Power Module. Use only a power cord that is in good condition.
Use the Proper Fuse
To avoid fire hazard, use only the fuse specified in the parts list for your
TM 5000 Series Power Module, and which is identical in type, voltage rating,
and current rating.
Do Not Remove Covers or Panels
To avoid personal injury, do not operate the OA 5000 or TM 5000 Series
Power Module without the panels or covers.
x
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Do Not Operate in Explosive Atmospheres
The OA 5000 provides no explosion protection from static discharges or
arcing components. Do not operate the OA 5000 in an atmosphere of explo-
sive gasses.
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xii
Safety
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A Quick Tour
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Installation
The OA 5000 Optical Attenuator is designed to operate in a Tektronix
TM 5000 Series Power Module or the right-hand slot of a Tektronix
OCP 5502. To ensure safe operation, follow all precautions listed in the
Power Module’s Operator Manual. Do not attempt to operate the OA 5000
with any other power source.
Install the OA 5000 as follows:
Step 1: Plug the TM 5000 Power Module or OCP 5502 into an appropri-
ate AC power source.
CAUTION
To prevent possible instrument damage, make sure the power
module is turned off before inserting the OA 5000.
Step 2: After ensuring the power module is turned off, align the top and
bottom grooves of the OA 5000 with the rails of the power module (in
the right-hand slot of the OCP 5502) and slide the OA 5000 in until the
edge connector snaps into place. See Figure 1-1. The OA 5000 front
panel should be flush with the power module cabinet.
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Installation
OA 5000
TM 5000 Series
Power Module
Release Lever
Figure 1-1: Installing the OA 5000 into the Power Module
If you will be programming the OA 5000 over the GPIB, perform the following
additional step:
Step 3: Attach the GPIB cable from your instrument controller to the
GPIB connector located on the back of the TM 5000 Power Module.
Before removing the OA 5000 from the power module, turn the power mod-
ule off.
Removing the
OA 5000
To remove the OA 5000 plug-in, grab the release lever and pull the instru-
ment out.
1 --- 2
A Quick Tour
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A Quick Tour
This section provides a brief overview of the OA 5000 Optical Attenuator. The
overview illustrates how easy it is to learn about and use the OA 5000.
You can read this section or you can choose to investigate the OA 5000 on
your own. If you decide not to read the overview, refer to the User Reference
section to answer any questions you may have. User Reference also de-
scribes details and features not covered in this section.
In this section you will set up the OA 5000 and change various settings to
show get a feel for how the OA 5000 works. You will not be using any optical
signals.
Figure 1-2, on page 1---4, presents a front panel view of the OA 5000.
If you have not already done so, install the OA 5000 as described on
page 1---1 and turn on the instrument.
Preset the OA 5000
Step 1: Press MODE so that the ATT indicator is lit and -- REF is not lit.
This sets the OA 5000 to display attenuation in absolute units rather than
displaying attenuation relative to a reference value.
Step 2: Press WAVELENGTH. The word SET will appear in the attenua-
tion display.
Step 3: Using the COARSE and FINE knobs, set the WAVELENGTH to
1300 nm.
The actual attenuation of an optical input signal varies depending on the
wavelength of the signal. To ensure accurate attenuation readings, set
WAVELENGTH to the wavelength of the signal you are attenuating.
Step 4: Press WAVELENGTH again to accept the new wavelength
value.
Step 5: Press DISABLE, so that it is not lit.
If the DISABLE button is lit, the shutter inside the OA 5000 blocks the
signal path, providing ≥100 dB attenuation for the OA 5002, OA 5012,
and OA 5022, and ≥90 dB attenuation for the OA 5032. When the
DISABLE button is not lit, the shutter is withdrawn from the optical
signal path, enabling you to set the attenuation value from 0 to 60 dB in
0.01 dB increments.
Step 6: Press MIN ATT.
This sets the OA 5000 to 0 dB attenuation.
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A Quick Tour
DISABLE
MIN ATT
STORE 1
STORE 2
RECALL 1
RECALL 2
REMOTE
MODE
SET REF
COARSE
ADDR
(SET)
WAVE-
LENGTH
FINE
Figure 1-2: OA 5002 Front Panel
Use the store and recall buttons to save one or two attenuator settings for
use at a later time.
Storing and
Recalling Settings
Step 7: Using the COARSE knob, set the attenuation to 10.00 dB.
Step 8: Store the attenuation setting by pressing STORE 1.
Step 9: Change the attenuation setting, using both the COARSE and
FINE knobs, to 21.50 dB.
Step 10: Store the attenuation setting by pressing STORE 2.
Step 11: Press MIN ATT and then press RECALL 1.
1 --- 4
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A Quick Tour
Check the ATTENUATION readout and verify that it is set to 10.00 dB.
Step 12: Press RECALL 2.
Check the ATTENUATION readout and verify that it is set to 21.50 dB.
The SET REF button allows you to set a reference value for the attenuation.
You can then measure attenuation relative to this set value.
Setting a Reference
Value
Step 13: Press MIN ATT.
This sets the OA 5000 to 0 dB attenuation.
Step 14: Press the SET REF button.
The word SET will appear in the wavelength display. The reference value
can now be adjusted with the COARSE and FINE knobs.
Step 15: Adjust the reference value for ---8.00 dB using the COARSE
and FINE knobs.
Step 16: Press the SET REF button to accept the displayed value. The
display will return to normal.
Step 17: Press the MODE button.
Notice that the -- REF indicator is lit, indicating that the attenuation
display is now displaying attenuation relative to a reference value. The
attenuation display shows 8.00 dB and the MIN ATT button is lit.
Step 18: Using the COARSE knob, adjust the attenuation to 10.00 dB.
Step 19: Press the MIN ATT button. Check that the attenuation readout
has changed to 8.00 dB and the MIN ATT button is lit.
The attenuation display reads 8.00 dB, instead of 0.00 dB, because the
display is still in reference mode and the reference value is (---8.00).
Pressing MIN ATT will set the OA 5000 to 0.00 dB only if the display is
not in reference mode or the reference value is 0.00 dB.
Step 20: Recall the first stored setting by pressing RECALL 1.
Remember that you set STORE 1 to 10.00 dB. Note that the attenuation
readout is 18.00 dB. The display shows the value: 10.00 --- (---8.00)=
18.00 dB.
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A Quick Tour
Step 21: Recall the second stored setting by pressing RECALL 2.
Note that the attenuation readout is now 29.50 dB. Remember that you
set STORE 2 to 21.50 dB. The display shows the value: 21.50 ---
(---8.00)= 29.50 dB.
Step 22: Push the MODE button so that just the ATT indicator is lit, and
then push MIN ATT.
Notice that the ATTENUATION display is now 0.00, because you
pressed the MIN ATT button and the display is no longer in reference
mode.
Settings at Power Up
One last thing to note are the settings used at power up. When you power
down the OA 5000, it saves the attenuation setting, the mode, the wave-
length, and reference levels. The next time you power up the OA 5000, it will
return to the settings stored when it was last powered down.
This completes the tour of the OA 5000.
1 --- 6
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User Reference
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Operator Overview
The User Reference section is arranged as an alphabetic list of topics. Each
topic covers one aspect of the operation of the OA 5000. Five topics follow
this operator overview:
The User Reference
Section
H
H
H
H
H
Enabling/Disabling Attenuation
Setting Attenuation Levels
Setting the GPIB Address
Setting the Reference Level
Storing and Recalling Attenuation Levels
Figure 2-1, on page 2---2, details the controls located on the OA 5000 front
panel.
NOTE
If, after power-up, the decimal points in the WAVELENGTH display
are flashing, the unit has lost its calibrator values and needs to be
recalibrated. Contact your local service center.
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Operator Overview
When this indicator is lit, the
attenuation is being changed. When
it is dark, the set attenuation level
has been achieved.
These lights indicate
whether the attenuation
display is in absolute
units or relative to a
reference value.
DISABLE
MIN ATT
The DISABLE button places
the shutter across the signal
path.
Pressing this button
generates a User
Request Event (URQ).
For more information,
see page 3---36. The
LED shows the
Remote/Local status. If
the LED is lit, the
OA 5000 is in remote
mode. If the LED is
flashing, the front
This button sets the
attenuation level to
minimum.
STORE 1
STORE 2
RECALL 1
RECALL 2
These buttons store
and recall attenuation
settings.
REMOTE
MODE
panel is locked out.
SET REF
COARSE
This button activates the
attenuation display
mode.
Use these knobs to
adjust the attenuation
level, the reference
level, the wavelength
setting, and the GPIB
address.
ADDR
(SET)
W A VE ---
LENGTH
This light indicates that
the OA 5000 has
requested service from
the instrument
FINE
controller.
When this button is lit,
the knobs are
assigned to adjust the
Reference value.
Use this button to assign the knobs
to set the GPIB address. The LED
is lit when the instrument is
When this button is lit, the
knobs are used to adjust the
wavelength setting.
addressed over the GPIB.
Figure 2-1: OA 5002 Front Panel
2 --- 2
User Reference
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Enabling/Disabling Attenuation
On the OA 5000, the DISABLE button (Figure 2-2) allows you to enable or
disable the optical path through the attenuator with a shutter. You can still
set the attenuation level, however, since it is not dependent on the optical
signal passing through the attenuator. For example, you can block the
passage of the optical signal through the attenuator by disabling attenua-
tion, setting the attenuation level, then enabling attenuation and your signal
will be attenuated to the desired level immediately.
DISABLE
This button enables or
disables attenuation.
MIN ATT
STORE 1
STORE 2
RECALL 1
RECALL 2
Figure 2-2: The Location of the DISABLE Button
To enable attenuation, press the DISABLE button on the front panel so that
the button is not lit. When the DISABLE button is not lit, the optical signal
passes through the attenuator.
To disable attenuation, press the DISABLE button so that it is lighted. When
the DISABLE button is lighted, the internal shutter is placed across the
optical path, providing ≥100 dB attenuation for the OA 5002, OA 5012, and
OA 5022, and ≥90 dB attenuation for the OA 5032.
WARNING
To prevent damage to your eyes, avoid looking into the optical
output port while there is an optical signal connected to the input
port. The disable function is only valid while the instrument is
switched on. When the OA 5000 is switched off, the shutter with-
draws from the optical path and the light is attenuated only by the
previous attenuator setting.
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Enabling/Disabling Attenuation
2 --- 4
User Reference
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Setting Attenuation Levels
Because the OA 5000 automatically adjusts the attenuator to correct for
different wavelengths, it is important, for attenuator accuracy, to correctly
match the displayed wavelength with the wavelength of the signal going into
the unit.
Setting attenuation levels on the OA 5000 requires you to perform two
procedures in the following order:
1. Specify the wavelength of the signal to be attenuated.
2. Set the level of attenuation.
Refer to Figure 2-3.
DISABLE
MIN ATT
This button sets
attenuation to the
STORE 1
STORE 2
RECALL 1
RECALL 2
minimum
value.
This button assigns the
ATTENUATION display to
either absolute units or
units relative to the
REMOTE
MODE
reference level.
SET REF
COARSE
These knobs set the
attenuation level,
reference level,
wavelength and GPIB
address.
ADDR
(SET)
WAVE-
LENGTH
FINE
Use this button to assign the
knobs to adjust the
wavelength.
Figure 2-3: Setting Attenuation Levels
To specify the wavelength to be attenuated:
Specifying the
Wavelength
Step 1: Press the WAVELENGTH button.
The word SEt will appear in the attenuation display and the WAVE-
LENGTH button will illuminate.
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Setting Attenuation Levels
Step 2: Use the two knobs to adjust the displayed wavelength value.
The COARSE knob changes the displayed value by 10 nm per click and
the FINE knob changes the displayed value by 1 nm per click. The
wavelength can be adjusted from 600 to 1700 nm.
Step 3: When the desired wavelength is displayed, press WAVE-
LENGTH again to accept the new displayed value. The OA 5000 will
return to the previous attenuation display mode.
To set the attenuation level once you have set the wavelength:
Setting the
Attenuation Level
Step 1: Set the attenuation display mode by pressing the MODE but-
ton.
The attenuation display shows the current attenuation value in one of two
modes, absolute or relative to a reference value. Pressing the MODE button,
while it is illuminated, toggles between these modes.
When the ATT light is on and the -- REF light is off, the displayed attenuation
is in absolute mode. In this mode, the displayed attenuation is the value
relative to its absolute minimum setting. The minimum value in this mode is
always 0 dB.
When both the ATT and -- REF lights are on, the displayed attenuation value
is the absolute attenuation value minus the value of the reference (refer to
the section Setting the Reference Value to set the reference). The COARSE
and FINE knobs still adjust the attenuation value as with absolute mode.
The only difference is the value displayed in the attenuation display.
Step 2: Set the desired attenuation value by adjusting the COARSE
and FINE knobs. The COARSE knob changes the attenuation by 1 dB
per click and the FINE knob changes the attenuation by 0.01 dB per
click.
NOTE
Switching between the absolute and relative display modes does
not change the actual attenuation value but only the value dis-
played.
2 --- 6
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Setting Attenuation Levels
To set the attenuation level to minimum, press the MIN ATT button.
Setting the
Attenuation Level to
Minimum
Setting the attenuation to minimum sets the absolute attenuation to 0 dB.
This means that the OA 5000 is not attenuating the optical input. However,
the attenuation display may not read 0 dB. As noted above, if the attenua-
tion display mode is set to relative, the attenuation display will show the
absolute attenuation value (0 dB after pressing MIN ATT) minus the value of
the reference. If the reference value is non-zero, then the attenuation display
will not be 0 dB after pressing MIN ATT.
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Setting Attenuation Levels
2 --- 8
User Reference
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Setting the GPIB Address
Setting the GPIB address is accomplished using the ADDR (SET) button
and the LEVEL ADJUST knobs (Figure 2-4).
DISABLE
MIN ATT
STORE 1
STORE 2
RECALL 1
RECALL 2
REMOTE
MODE
SET REF
COARSE
Turning either knob
changes the GPIB
address (when the
ADDR button is lit).
ADDR
(SET)
W A VE ---
LENGTH
This button assigns
the knobs to set the
GPIB address.
FINE
Figure 2-4: The Location of the ADDR (SET) Button
To set the GPIB address:
Step 1: Press the ADDR (SET) button so that it is lighted. The ATTEN-
UATION display will change to read Addr and the GPIB address will be
displayed in the WAVELENGTH display.
Step 2: Use either the COARSE or FINE knobs to change the address.
Step 3: When the address is set, press the ADDR (SET) button again
to enter the change of address.
The ADDR (SET) button also indicates the addressed status of the OA 5000
from the GPIB (when the GPIB address is not being set). When the button is
lit, the OA 5000 has been addressed to talk or listen by a controller on the
GPIB.
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Setting the GPIB Address
NOTE
Valid GPIB addresses are 0 through 30. If the GPIB address is
increased past 30, the display will show the word “OFF.” If OFF is
entered as the address, the OA 5000 will not be addressable over
the GPIB and it will not participate in any GPIB transactions.
2 --- 1 0
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Setting the Reference Level
You can set the display of the OA 5000 to reflect the attenuation of the
system rather than just the attenuation provided by the OA 5000. For exam-
ple, if your system insertion loss is 1.55 dB, you could set the reference
value to ---1.55 dB and the attenuation displayed would range from 1.55 dB
to 61.55 dB, instead of 0 dB to 60 dB.
Use the following procedure to set the reference level:
Step 1: Press SET REF so that it is lit (Figure 2-5).
Step 2: Adjust the reference level using the knobs.
Step 3: After setting the reference level, press the SET REF button
again.
DISABLE
MIN ATT
STORE 1
STORE 2
RECALL 1
RECALL 2
REMOTE
MODE
SET REF
COARSE
This button assigns
the knobs to set the
Reference Level.
ADDR
(SET)
WAVE-
LENGTH
FINE
Figure 2-5: The Location of the SET REF Button
Once you have set the reference level, you may wish to change the attenua-
tion display mode. To set the display mode so that the reference level is
subtracted from the attenuation provided by the OA 5000, press the MODE
button so that the -- REF indicator is lighted.
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Setting the Reference Level
The reference mode has two primary applications:
1. Reading total attenuation (insertion loss)
2. Approximating signal power
The total attenuation of any attenuator is the sum of the attenuation caused
by the connections (the insertion loss) and the attenuation caused by the
active element. Since the insertion loss is dependent on many factors, it is
hard to determine this value precisely. Some of the factors that affect inser-
tion loss are the condition of the connectors, the cleanliness of the connec-
tors, and the mode pattern of the fiber. Nonetheless, you can measure
insertion loss.
Measuring Insertion
Loss
Step 1: Connect a stable source to an optical power meter using two
optical cables that have been joined with an in-line adapter.
Step 2: Measure the power on a suitable optical power meter and
measure the optical power in dBm.
Step 3: Disconnect the cables at the in-line adapter and connect them
to the optical attenuator (which should be set at minimum attenuation).
Step 4: Measure the resultant power in dBm.
The insertion loss (within the connector uncertainty) is the difference be-
tween the power reading with only the optical cables and the reading with
the cables plus the attenuator. The insertion loss specification for the
OA 5000 attenuators is ≤2.0 dB. The total attenuation is the insertion loss
plus the attenuation level shown on the OA 5000. Thus, by setting the refer-
ence level to the value of the insertion loss and enabling the reference
display mode, the OA 5000 can display the total attenuation of the attenua-
tion system.
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Setting the Reference Level
The second application for reference mode is approximating signal power
after the source has been attenuated.
Approximating Signal
Power
Step 1: Set the attenuator to its minimum reference level.
Step 2: Measure the power (in dBm) from the fiber connected to the
output optical connector.
Step 3: Set the reference value to this number.
Once this level has been set and the OA 5000 is in reference mode, the
displayed attenuation is the negative of the power level in dBm. For exam-
ple, if the power level is ---2.5 dBm when the attenuator is at its minimum
attenuation level and this is entered as the reference level, then the display
will read 2.5 dB when set to REF mode. Then, if you increase the attenuation
by 10 dB, the display will read 12.5, which is the negative of the power level
in dBm.
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Setting the Reference Level
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Storing and Recalling
Attenuation Levels
The OA 5000 can store two attenuation levels for later recall. This can help
save you time and minimize mistakes. Refer to Figure 2-6.
DISABLE
MIN ATT
STORE 1
STORE 2
RECALL 1
RECALL 2
These buttons store
and recall attenuation
settings.
Figure 2-6: The Location of the STORE and RECALL Buttons
To store an attenuation setting
H
press either STORE1 or STORE2.
The current attenuation setting will be stored. The ATTENUATION display
will blink once to indicate acceptance of the value.
NOTE
When you press STORE1 or STORE2, the only setting saved is the
attenuation setting. The wavelength setting is not stored. If the
wavelength of your signal has changed since the attenuation setting
was stored, you will have to adjust the wavelength setting to ensure
accurate attenuation.
To recall an attenuation setting
H
press either RECALL1 or RECALL2.
The selected setting will be recalled.
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Storing and Recalling Attenuation Levels
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User Reference
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Programming
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Setting Up the Instrument
This section tells you how to prepare the OA 5000 Optical Attenuator for use
with a remote controller or computer. The first part of this section explains
how to connect the OA 5000 to a controller or computer through the GPIB
interface. The rest of the section describes how to use the OA 5000 front
panel settings to enable the OA 5000 to send and receive messages to and
from a remote controller.
NOTE
In addition to the information in this manual, you will need to con-
sult the documentation for your controller to determine how to send
commands, send interface messages such as local lockout and
serial poll, and receive query responses from within the program-
ming language running on your controller or computer. Also, you
will need to determine how to assert various GPIB lines, including
remote enable and attention from within the programming lan-
guage running your controller or computer.
You can control the OA 5000 with a remote controller or computer that uses
the IEEE Std 488.1-1987 (GPIB) interface.
Controllers
The OA 5000 is connected to the GPIB through the TM5000 Series power
module in which it is installed. Connect the TM5000 power module to the
GPIB using an IEEE Std 488 GPIB cable (available as Tektronix part number
012-0991-00). The TM5000 power module has a 24-pin GPIB connector on
its rear panel (Figure 3-1). This connector has a D-type shell and conforms
to IEEE Std 488.
Using the GPIB
Interface
You can also stack GPIB connectors.
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Setting Up the Instrument
GPIB Connector
Figure 3-1: GPIB Connector Location
GPIB Requirements
Observe these rules when using your OA 5000 with a GPIB network:
H
Each device on the bus must be assigned a unique device address; no
two devices can share the same device address.
H
H
H
Do not connect more than 15 devices to any one bus.
Connect one device for every 6 feet (2 meters) of cable used.
Do not use more than 65 feet (20 meters) of cable to connect devices to
a bus.
H
H
At least two-thirds of the devices on the network must be turned on
while the network is operating.
Connect the devices on the network in a star or linear configuration as
shown in Figure 3-2. Do not use loop or parallel configurations.
GPIB Device
GPIB Device
GPIB Device
GPIB Device
GPIB Device
GPIB Device
GPIB Device
Figure 3-2: Typical GPIB Network Configurations
Appendix C, Interface Specifications, gives additional information on the
OA 5000 GPIB configuration.
3 --- 2
Programming
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Setting Up the Instrument
Setting the GPIB Address
Once you have connected the OA 5000 through the GPIB interface, you
need to set its GPIB address to allow it to communicate through the inter-
face.
To set the GPIB address:
Step 1: Press the ADDR (SET) button so that it is lighted. The ATTEN-
UATION display will change to read Addr and the GPIB address will be
displayed in the WAVELENGTH display.
Step 2: Use either the COARSE or FINE knobs to change the address.
Step 3: When the address is set, press the ADDR (SET) button again
to enter the change of address.
Once you have set the address, you can control the OA 5000 through the
GPIB interface.
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Command Syntax
You can control the OA 5000 through the GPIB using a large group of com-
mands and queries. This section describes the syntax these commands and
queries use and the conventions the OA 5000 uses to process them. The
commands and queries themselves are listed in the section entitled Com-
mands.
You transmit commands to the OA 5000 using the enhanced American
Standard Code for Information Interchange (ASCII) character encoding.
Appendix C includes a chart of the ASCII character set.
This manual uses Backus-Naur Form (BNF) notation and syntax diagrams to
describe commands and queries. The syntax diagrams follow the notations
and conventions of the ANSI/IEEE Std 488.2-1987, section 7.2.
This manual uses the following BNF symbols listed in Table 3-1.
Table 3-1: BNF Symbols and Meanings
Symbol
Meaning
<
>
Defined element
::=
|
Is Defined As
Exclusive OR
{
[
}
Group; one element is required
Optional; can be omitted
Previous element(s) may be repeated
Comment
]
. . .
(
)
You can stop any query or process by using the Device Clear (DCL) GPIB
interface message.
Clearing the
OA 5000
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Command Syntax
Commands consist of set commands and query commands (usually simply
called commands and queries). Commands modify instrument settings or
tell the OA 5000 to take a specific action. Queries cause the OA 5000 to
return information about its status.
Command and
Query Structure
Most commands have both a set form and a query form. The query form of
the command is the same as the set form but with a question mark on the
end. For example, the set command ATT:DB has a query form ATT:DB?.
Not all commands have both a set and query form; some commands are set
only and some are query only.
A command message is a command or query name, followed by any infor-
mation the OA 5000 needs to execute the command or query. Command
messages consist of three different element types, defined in Table 3-2 and
shown in the example in Figure 3-3.
Table 3-2: Command Message Elements
Symbol
Meaning
<Header>
The basic command name. If the header ends with a
question mark, the command is a query. The header
may begin with a colon (:) character; if the command is
concatenated with other commands the beginning colon
is required. The beginning colon can never be used with
command headers beginning with star (*).
<Mnemonic>
<Argument>
A header sub-function. Some command headers have
only one mnemonic. If a command header has multiple
mnemonics, they are always separated from each other
by a colon (:) character.
A quantity, quality, restriction, or limit associated with the
header. Not all commands have an argument, while
other commands have multiple arguments. Arguments
are separated from the header by one or more space
characters. Arguments are separated from each other
by a <Separator>, defined below.
<Separator>
A separator between arguments of multiple-argument
commands. The separator can be a single comma, or it
may optionally have white space characters before and
after the comma.
Header
ATT:DB 10
Mnemonics
Argument
Figure 3-3: Command Message Elements
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Command Syntax
Commands
Commands cause the OA 5000 to perform a specific function or change one
of its settings. Commands have the structure:
H
[:]<Header>[<Space><Argument>[<Separator><Argu-
ment>]...]
Queries
Queries cause the OA 5000 to return information about its status or settings.
Queries have the structure:
H
H
[:]<Header>?
[:]<Header>?[<Space><Argument>[<Separator><Argu-
ment>]...]
You may use only a part of the header in a query command. When you do
this, the instrument returns information about all the possible mnemonics
that you have left unspecified. For example, ATT:DB? returns the current
setting in absolute dB units, while ATT? returns the setting in absolute units
and units relative to the reference.
Headers in Query Responses
You can control whether or not headers are returned by the OA 5000 as part
of the query response. Use the HEADER command to control this feature. If
header is on, command headers are returned as part of the query, and the
query response is formatted as a valid set command. When header is off,
only the values are sent back in the response, which may be easier to parse
and to extract the information. Table 3-3 shows the difference in responses.
Table 3-3: Comparison of Header On and Off Responses
Query
Header Off Response
Header On Response
:DISP DB
DISP?
DB
ATT:DB?
32.53
:ATT:DB 32.53
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Command Syntax
H
H
Enter commands in upper or lower case.
Command Entry
Precede any command with blank characters. Blank characters include
any combination of the ASCII control characters 00 through 09 and 0B
through 20 hexadecimal (0 through 9 and 11 through 32 decimal).
H
The OA 5000 ignores commands consisting of any combination of blank
characters, carriage returns, and line feeds.
Abbreviating Commands
Many OA 5000 commands can be abbreviated. These abbreviations are
shown in capitals in the command’s listing in the Commands section. For
example, the command DISPlay can be entered simply as DISP or dis-
play.
If you use the HEADER command to have command headers included as
part of query responses, you can further control whether the returned head-
ers are abbreviated or are full-length. The VERBOSE command lets you
control this.
Concatenating Commands
You can concatenate any combination of set commands and queries using
a semicolon (;). The OA 5000 executes concatenated commands in the
order received. Concatenating commands is useful when you want to avoid
events generated by conflicting settings — see Conflicts on page 3---40.
When concatenating commands and queries you must follow these rules:
3. Completely different headers must be separated by both a semicolon
and by the beginning colon on all commands but the first. For example,
the commands ATT:DB 15 and DISABLE OFF would be concatenated
into a single command:
ATT:DB 15;:DIS OFF
4. Never precede a star (*) command with a colon:
ATT:DB 10;*OPC
5. When you concatenate queries, the responses to all the queries are
concatenated into a single response message. For example, if the
display mode is dB and the attenuator is 20 dB, the concatenated query
DISP?;:ATT:DB?
will return either DISP DB;:ATT:DB 20 if Header is set to on, or DB;20
if Header is set to off.
6. Set commands and queries may be concatenated in the same mes-
sage. For example:
ATT:DB 15;DISP DB;DIS?;:ADJ?
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Command Syntax
is a valid message that sets the attenuation to 15 dB, the display mode
to dB, and responds with the disable status and the adjusting status.
Concatenated commands and queries are executed in the order re-
ceived.
Here are some invalid concatenations:
H
DISPLAY DBR;ATT:DBR 5
no colon before ATT
H
ATT:MIN;:*OPC
extra colon before a star (*) command
Message Terminators
This manual uses <EOI> (End or Identify) to represent a message termina-
tor.
Symbol
Meaning
<EOI>
Message terminator
If you use a GPIB network, <EOI> can be the IEEE Std 488 EOI interface
symbol or LF (line feed). When using GPIB, the OA 5000 always accepts the
EOI interface symbol as an input message terminator.
The end-of-message terminator may be either the END message (EOI
asserted concurrently with the last data byte), the ASCII code for line feed
(LF) sent as the last data byte, or both.
The end-of message terminator should not immediately follow a semicolon
(;).
The OA 5000 always terminates responses to queries with linefeed and EOI
asserted.
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Command Syntax
The argument of a command may be in one of several forms. The individual
descriptions of each command tell which argument types to use with that
command.
Argument Types
Block Arguments
One OA 5000 command utilizes a block argument form:
Symbol
<Block>
<NZDig>
<Dig>
Meaning
A block of data bytes, defined below
A non-zero digit character, in the range 1 --- 9
A digit character, in the range 0 --- 9
<DChar>
A character with the binary equivalent of 0 through
FF hexadecimal (0 through 255 decimal)
The block argument is in the following format:
<Block> ::= #<NZDig><Dig>[<Dig>. . .][<DChar>. . .]
H
<NZDig> specifies the number of <Dig> elements that follow. Taken togeth-
er, the <Dig> elements form a decimal integer that specifies how many
<DChar> elements follow.
Block Argument
BLRN #222(binary data - 22 bytes)
Specifies Data Length
Specifies Number of
Length Digits that Follow
Block Header
Figure 3-4: Block Argument Example
The block argument can also take the following format:
H
<Block> ::= #0[<DChar>. . .]<EOI>
Under IEEE Std 488.2 this is also a valid form for block arguments. If this
form is used, the last byte of the block must have EOI asserted. Conse-
quently, this must be the last or only command. Although the OA 5000
accepts this format, it will never respond to a query with this format.
Numeric Arguments
Many OA 5000 commands require numeric arguments. This manual repre-
sents these arguments as follows:
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Command Syntax
Symbol
<NR1>
<NR2>
<NR3>
<NRf>
Meaning
Signed integer value
Floating point value without an exponent
Floating point value with an exponent
Flexible numeric argument {NR1|NR2|NR3}. A suffix com-
posed of a multiplier (letter exponent) and units may be used
as an alternate to NR3. For example, this numeric type would
let you use “10nm” as an alternate to “10E---9m”
The syntax diagrams in this manual use the following symbols and notation:
Syntax Diagrams
H
Circles and ovals contain literal elements that must be sent exactly as
shown. Command and query names are abbreviated to the minimum
required spelling.
H
H
Boxes contain the defined elements described earlier in this section,
such as <NRf> or <QString>.
Arrows connect the elements and show the allowed paths through the
diagram. This also shows the different orders in which the elements can
be sent. Parallel paths show that one and only one of the paths must be
taken. A path around a group of elements shows that those elements
are optional. Loops show elements that can be repeated.
Figure 3-5 shows the structure of a few typical syntax diagrams.
Figure 3-5: Typical Syntax Diagrams
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Command Syntax
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Commands
OA 5000 commands fall into two main groups: Common Commands and
Device Commands. The commands follow Tektronix Standard Codes and
Formats 1991.
Most of these commands can be used either as set commands or queries.
However, some commands can only be used to set: these have the words
“No Query Form” included with the command name. Other commands can
only be used to query: these have a question mark appended to the header,
and include the words “Query Only” in the command name.
Headers, mnemonics, and arguments are usually spelled out fully in text,
with the minimum required spelling shown in upper case. For example, to
use the command RECall you must enter at least REC. The examples in this
manual use the abbreviated forms.
Several commands and queries used with the OA 5000 are common to all
devices on the GPIB. These commands and queries are defined by IEEE
Std 488.2-1987 and Tektronix Standard Codes and Formats 1991 as useful
across all instruments in a GPIB system.
Common
Commands
and Queries
Table 3-4 lists the Common Commands supported by the OA 5000. Com-
plete descriptions of these commands appear in an alphabetical listing of
commands later in this section.
Table 3-4: Commands Common to All GPIB Devices and
Supported by the OA 5000 Series
Header
ALLev?
BLRN
Full Command Name
All Events
Binary Device Setup
Instrument Self Calibration
Clear Status
*CAL?1
*CLS
DESE
Device Event Status Enable
Standard Event Status Enable
Standard Event Status Register
Event
*ESE
*ESR?
EVENT?
EVMSG?
EVQTy?
Event Message
Number of Events in Queue
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Commands
Table 3-4: Commands Common to All GPIB Devices and
Supported by the OA 5000 Series (Cont.)
Header
Full Command Name
Set to Factory Defaults
Header
FACTory
HEADer
*IDN?
*LRN?
*OPC
Identification
Learn Device Setup
Operation Complete
Power-On Status Clear
Reset
*PSC
*RST
*SRE
Service Request Enable
Read Status Byte
Self-Test
*STB?
*TST?
VERBOSE
*WAI
Verbose
Wait To Continue
1
*CAL? always returns 0.
Table 3-5 lists the device commands, queries, and command parameters
that are specific to the OA 5000. Complete descriptions of these commands
appear in the alphabetical listing of commands that immediately follows this
table.
Device Commands
and Queries
Table 3-5: OA 5000 Device Commands and Parameters
Header
Full Command Name
Attenuator Adjusting
ADJusting?
ATTen
Attenuation
ATTen:DB
ATTen:DBR
ATTen:MIN
DISable
DISPlay
RECall
Attenuation in Absolute Terms
Attenuation with Reference Value
Minimum Attenuation
Light Shutter Status
Front Panel Display Mode
Recall Attenuation Setting
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Commands
Table 3-5: OA 5000 Device Commands and Parameters (Cont.)
Header
Full Command Name
Reference
REFerence
STORe1|2
WAVelength
Store Attenuation
Wavelength
ADJusting? (Query Only)
The ADJusting? query returns the status of the attenuator. A 1 is returned if
the attenuator is moving to some attenuation value. A 0 is returned if the
attenuator is stationary.
*OPC, *WAI.
Related Commands:
Syntax:
ADJusting?
ADJusting
?
ADJ?
Examples:
would return the string ”:ADJUSTING 0” or ”:ADJUSTING 1”.
ALLev? (Query Only)
The ALLev? query causes the OA 5000 to return all events and their mes-
sages. This query also removes the returned events from the Event Queue.
The messages are separated by commas. Use the *ESR? query to enable
the events to be returned. For a complete discussion of the use of these
registers, see page 3---35. This command is similar to repeatedly sending
EVMsg? queries to the OA 5000.
*CLS, DESE, *ESE, *ESR?, EVENT?, EVMsg?, EVQTY, *SRE, *STB?
Related Commands:
Syntax:
ALLev?
ALLev
?
The event code and message in the following format:
Returns:
<Event Code><Comma><QString>[<Event Code><Com-
ma><QString>...]
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Commands
<QString>::= <Message>;[<Command>]
<Command> is the command that caused the error and may be returned
when a command error is detected by the OA 5000. As much of the com-
mand will be returned as possible without exceeding the 60 character limit of
the <Message> and <Command> strings combined. The command string is
right-justified.
ALLev?
Examples:
might return the string 401,”Power on” or 113,”Undefined head-
er; unrecognized command-abc”.
ATTenuation
ATTenuation can be used as both a query and as a command to set device
parameters. ATTenuation has three parameters: DB, DBR, and MIN. Use the
DB term to query or set attenuation in absolute terms relative to minimum
attenuation. To query or set attenuation values relative to the REFerence
value, use the DBR term. To set the attenuation to the minimum (0 dB), use
the MIN term.
NOTE
Attenuation can be changed even if the light shutter is closed.
STORe, RECall.
Related Commands:
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Commands
ATTen:DB?
Syntax:
ATTen:DBR?
ATTen:DB <NRf>
ATTen:DBR <NRf>
ATTen:MIN
ATTen:MIN?
ATTen?
DB
?
DBR
DB
<space>
<NRf>
DBR
:
MIN
MIN
?
ATTen
?
If you make a query without an argument (for example, ATTen?), the re-
sponse is the same as that for an ATTen:DB?; DBR? query.
Arguments:
Examples:
ATT:DB?
returns the string
:ATTEN:DB <present setting, absolute>
ATT:DBR?
returns the string
:ATTEN:DBR <present setting, minus REF>
ATT:MIN?
returns the string
:ATTEN:MIN <1 if at min, 0 otherwise>
BLRN
The query version of this command reads the instrument configuration in
binary form. The command version configures the instrument binary data
format. The configuration is 22 bytes long.
*LRN.
Related Commands:
Syntax:
BLRN <Block>
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Commands
BLRN?
<Space>
?
<Block>
BLRN
BLRN?
might return the response:
Examples:
BLRN #222 <22 bytes of binary data>
*CAL? (Query Only)
This command performs no function in the OA 5000. It is included for com-
pliance with IEEE Std 488.2.
N/A
Related Commands:
Syntax:
*CAL?
*CAL
?
*CAL?
would return ”0”.
Examples:
*CLS (No Query Form)
The *CLS (Clear Status) command clears the OA 5000 status data struc-
tures. This command also puts the OA 5000 in the Operation Complete
Command Idle State and in the Operation Complete Query Idle State. While
in these states the OA 5000 has nothing in its buffers and does not execute
commands or queries.
DESE, *ESE, *ESR, EVENT?, EVMSG?,*SRE, *STB.
Related Commands:
Syntax:
*CLS
*CLS
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Commands
The *CLS command clears
H
H
H
the Event Queue,
the Standard Event Status Register (SESR), and
the Status Byte Register (except the MAV bit; see below).
If the *CLS command immediately follows an <EOI>, the Output Queue and
MAV bit (Status Byte Register bit 4) are also cleared. MAV indicates informa-
tion is in the output queue. DCL will clear the output queue and thus MAV.
*CLS does not clear the output queue or MAV. (A complete discussion of
these registers and bits and of event handling in general is on page 3---35.)
DESE
The DESE (Device Event Status Enable) command sets and queries the bits
in the Device Event Status Enable Register (DESER). The DESER prevents
events from being reported to the Standard Event Status Register (SESR)
and from being entered into the Event Queue. For a complete discussion of
the use of these registers, see page 3---35.
*CLS, *ESE, *ESR, EVENT?, EVMSG?, *SRE, *STB.
Related Commands:
Syntax:
DESE <NRf>
DESE?
<Space>
?
<NRf>
DESE
<NRf> is a value in the range from 0 to 255. The binary bits of the DESER
are set according to this value. For example, DESE 209 sets the DESER to
the binary value 11010001 (that is, the first bit in the register is set to 1, the
second bit to 1, the third bit to 0, etc.).
Arguments:
The power-on default for DESER is all bits set if *PSC is 1. If *PSC is 0, the
DESER maintains its value through a power cycle.
NOTE
Setting the DESER and the ESER to the same value allows only
those codes to be entered into the Event Queue and summarized
on the ESB bit (bit 5) of the Status Byte Register. Use the *ESE
command to set the ESER. A complete discussion of event handl-
i ng i s on pag e 3 --- 35.
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Commands
DESE 209
sets the DESER to binary 11010001, which enables the PON, URQ, EXE,
and OPC bits.
Examples:
DESE?
might return the string :DESE 186, showing that the DESER contains
the binary value 10111010.
DISable
To query or set the status of the light shutter, use the DISable term. A DIS-
able argument of 1, or ON, closes the light shutter and blocks all light
through the fiber ports. A DISable argument of 0, or OFF, opens the shutter
and allows light to pass through the fiber ports (light will be attenuated at the
level specified by the ATTEN:DB or ATTEN:DBR terms).
Related Commands:
Syntax:
DISable {ON|1}
DISable {OFF|0}
Disable?
ON
1
<Space>
OFF
DISable
0
?
DIS?
Examples:
returns the string
DIS 0
if the light shutter is not closed.
DISPlay
Use the DISPlay command to set the front panel display mode. The DB and
DBRef parameters specify display of attenuation relative to minimum attenu-
ation and relative to the reference values respectively. The SETRef and
SETWavelength parameters put the front panel in a state which that the user
to set the reference value and the wavelength via the front panel controls.
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Commands
Related Commands:
Syntax:
DISPlay {DB|DBR|SETRef|SETWavelength}
DISPlay?
DB
DBR
SETRef
<space>
SETWavelength
DISPlay
?
DISP?
Examples:
returns the string
:DISP DB
DISP:SETRef
Sets the front panel to the Set Reference mode (has the same effect as
pressing the SET REF button on the front panel).
*ESE
The *ESE (Event Status Enable) command sets and queries the bits in the
Event Status Enable Register (ESER). The ESER prevents events from being
reported to the Status Byte Register (STB). For a complete discussion of the
use of these registers, see page 3---35.
*CLS, DESE, *ESR, EVENT?, EVMSG? *SRE, *STB.
Related Commands:
Syntax:
*ESE <NRf>
*ESE?
<Space>
?
<NRf>
*ESE
<NRf> is a value in the range from 0 through 255. The binary bits of the
ESER are set according to this value.
Arguments:
The power-on default for ESER is 0 if *PSC is 1. If *PSC is 0, the ESER
maintains its value through a power cycle.
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Commands
NOTE
Setting the DESER and the ESER to the same value allows only
those codes to be entered into the Event Queue and summarized
on the ESB bit (bit 5) of the Status Byte Register. Use the DESE
command to set the DESER. A complete discussion of event handl-
i ng i s on pag e 3 --- 35.
*ESE 209
Examples:
sets the ESER to binary 11010001, which enables the PON, URQ, EXE,
and OPC bits.
*ESE?
might return the string *ESE 186, showing that the ESER contains the
binary value 10111010.
*ESR? (Query Only)
The *ESR? (Event Status Register) query returns the contents of the Stan-
dard Event Status Register (SESR). *ESR? also clears the SESR (since
reading the SESR clears it). For a complete discussion of the use of these
registers, see page 3---35.
ALLev?, *CLS, DESE, *ESE, EVENT?, EVMSG?, EVQTy?, *SRE, *STB.
Related Commands:
Syntax:
*ESR?
*ESR
?
*ESR?
Examples:
might return the value 213, showing that the SESR contains binary
11010101.
EVEnt? (Query Only)
The EVEnt? query returns from the Event Queue an event code that pro-
vides information about the results of the last *ESR? read. EVENT? also
removes the returned value from the Event Queue. Note the the ALLev?
command removes all pending events from the event queue and places
them in the output queue. A complete discussion of event handling is on
page 3---35.
ALLev?, *CLS, DESE, *ESE, *ESR?, EVMSG?, EVQty?, *SRE, *STB.
Related Commands:
Syntax:
EVEnt?
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Commands
EVEnt
?
EVEnt?
Examples:
might return the response :EVENT 110, showing that there was an
error in a command header.
EVMSG? (Query Only)
The EVMSG? query removes from the Event Queue a single event code
associated with the results of the last *ESR? read and returns the event
code along with an explanatory message. A complete discussion of event
handling is on page 3---35.
*CLS, DESE, *ESE, *ESR?, EVENT?, *SRE, *STB.
Related Commands:
Syntax:
EVMSG?
EVMSG
?
EVMSG?
Examples:
might return the message :EVMSG 110,”Command header error”.
EVQty? (Query Only)
The EVQty? query returns returns the number of events associated with the
last Standard Event Status Register read and thus the length of a subse-
quent response to an ALLev? query. The maximum number of event queue
items is 32.
*CLS, DESE, *ESE, *ESR?, EVMSG?, *SRE, *STB.
Related Commands:
Syntax:
EVQty?
EVQty
?
EVQty?
Examples:
might return the response :EVQTY 4, showing that there are four events
in the event queue.
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Commands
FACTORY (No Query Form)
The FACTORY command resets the OA 5000 to its factory default settings
and purges stored settings.
NOTE
The FACTORY command can take 5 to 10 seconds to complete
depending on attenuation settings.
DESE, *ESE, HEADER, *PSC, *RST, *SRE, VERBOSE.
Related Commands:
Syntax:
FACTORY
FACTORY
The FACTORY command does the following:
H
H
H
Puts the OA 5000 in the Operation Complete Command Idle State.
Puts the OA 5000 in the Operation Complete Query Idle State.
Clears the Event Status Enable Register (equivalent to the command
*ESE 0).
H
H
H
H
H
H
Clears the Service Request Enable Register (equivalent to the command
*SRE 0).
Sets the Device Event Status Enable Register to all-enabled (equivalent
to the command DESE 255).
Sets the Power-on status clear flag to TRUE (equivalent to the command
*PSC 1).
Sets the Response Header Enable State to TRUE (equivalent to the
command HEADER 1).
Sets the Verbose Header State to TRUE (equivalent to the command
VERBOSE 1).
Sets the front panel as shown in Table 3-6.
Table 3-6: FACTORY Front Panel Settings
Front Panel Parameter
DISP:DB
ATT:DB
Setting
0
0
0
0
REF
STORE1
STORE2
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Commands
Table 3-6: FACTORY Front Panel Settings (Cont.)
Front Panel Parameter
Setting
OFF
DISABLE
WAVELENGTH
1300
The FACTORY command does not alter the following items:
H
H
H
The state of the GPIB (IEEE Std 488.2) interfaces.
The selected GPIB address.
Calibration data that affects device specifications.
HEADer
The HEADer command sets and queries the Response Header Enable State
that causes the OA 5000 to either include or omit headers on query re-
sponses. This command does not affect IEEE Std 488.2 Common Com-
mands (those starting with an asterisk) or the *LRN? response.
VERBOSE.
Related Commands:
HEADer { ON | OFF | <NRf> }
HEADer?
Syntax:
ON
<Space>
OFF
<NRf>
HEADer
?
ON or <NRf> ¸ 0 sets the Response Header Enable State to TRUE. This
causes the OA 5000 to include headers on applicable query responses. You
can then use the query response as a command.
Arguments:
OFF or <NRf> = 0 sets the Response Header Enable State to FALSE. This
causes the OA 5000 to omit headers on query responses, so that only the
argument is returned.
HEADER OFF
Examples:
causes the OA 5000 to omit headers from query responses.
HEADER 1
causes the OA 5000 to include headers on applicable query responses.
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Commands
HEADER?
might return the value 1, showing that the Response Header Enable
State is TRUE.
*IDN? (Query Only)
The *IDN? (Identification) query returns the OA 5000’s unique identification
code.
N/A
Related Commands:
Syntax:
*IDN?
*IDN
?
The query response is an ASCII string separated into four fields by commas:
TEKTRONIX,OA5002,<serial number>,CF:91.1CN RM:<firm-
ware version number>
*IDN?
Examples:
might return the response
TEKTRONIX,OA5002,B010101,CF:91.1CN RM:1.5
*LRN? or SET?
The *LRN? (Learn Device Setup) or SET? query returns a string listing the
OA 5000’s settings, except for calibration values. You can use this string to
return the OA 5000 to the state it was in when you made the *LRN? query.
HEADER, VERBOSE.
Related Commands:
Syntax:
*LRN?
SET?
*LRN
?
SET
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Commands
NOTE
The *LRN? query always returns a string with command headers,
regardless of the setting of the HEADER command. This is because
the returned string is intended to be able to be sent back to the
OA 5000 as a command string. The VERBOSE command can still
be used normally to specify whether the returned headers should
be abbreviated or full length.
*LRN?
Examples:
might return the string:
:REFERENCE 0.00;:WAVELENGTH 1300;:ATTENUATION:DB
0.00;:DISPLAY DB;:DISABLE 0;:STORE1 0.00;:STORE2 0.00
*OPC
The *OPC (Operation Complete) command generates the operation com-
plete message in the Standard Event Status Register (SESR) when all
pending operations finish. The *OPC? query places the ASCII character “1”
into the Output Queue when all pending operations are finished. The *OPC?
response is not available to read until all pending operations finish. For a
complete discussion of the use of these registers and the output queue, see
page 3---35.
*WAI, ADJusting?
Related Commands:
Syntax:
*OPC
*OPC?
*OPC
?
*PSC
The *PSC (Power-On Status Clear) command sets and queries the power-on
status flag that controls the automatic power-on handling of the DESER,
SRER, and ESER registers. When PSC is TRUE, the DESER register is set to
255 and the SRER and ESER registers are set to 0 at power-on. When PSC
is FALSE, the current values in the DESER, SRER, and ESER registers are
preserved in non-volatile memory when power is shut off and restored at
power-on. For a complete discussion of the use of these registers, see
page 3---35.
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Commands
DESE, *ESE, *RST, *SRE.
Related Commands:
Syntax:
*PSC <NRf>
*PSC?
<Space>
?
<NRf>
*PSC
<NRf> is a value in the range from ---32767 to 32767.
Arguments:
<NRf> = 0 sets the power-on status clear flag to FALSE, and disables the
power-on clear and allows the OA 5000 to assert SRQ after power-on.
<NRf> ¸ 0 sets the power-on status clear flag TRUE. Sending *PSC 1
therefore enables the power-on clear and prevents any SRQ assertion after
power-on. Using an out-of-range value causes an execution error.
*PSC 0
Examples:
sets the power-on status clear flag to FALSE.
*PSC?
might return the value 1, showing that the power-on status clear flag is
set to TRUE.
RECall (No Query Form)
The RECall command sets the attenuation of the instrument to either stored
value 1 or 2.
STORe
Related Commands:
Syntax:
RECall {1 | 2}
1
RECall
<Space>
2
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Commands
REFerence
This command reads and sets the reference used when displaying the
attenuation in the ATT---REF mode. The units for command mode and
responses is dB. Values smaller than 0.01 dB are rounded to the nearest
one-hundredth dB. The REF value may not exceed 99.99. The combina-
tion of the REF value and the ATTen value may not exceed 99.99. For
example, if the ATTen value is set to 30 dB and the REF value is set to
---70 dB, the resultant ATT---REF value would be 100 dB, and an execution
error event would result. The factory default for REF is 0.00 (dB).
N/A
Related Commands:
REFerence <NRf>
REFerence?
Syntax:
<Space>
?
<NRf>
REFerence
<NRf> is a number that cannot exceed 99.99.
Arguments:
Examples:
REF 45.00
sets the REFerence value to 45.00 dB.
REF?
would return the string ”:REF 45.00”.
*RST (No Query Form)
The *RST (Reset) command returns the OA 5000 to a known set of instru-
ment settings.
NOTE
The *RST command can take 5 to 10 seconds to complete depend-
ing on attenuation settings.
*PSC, FACTory.
Related Commands:
Syntax:
*RST
*RST
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Commands
*RST does the following:
H
H
H
Puts the OA 5000 into the Operation Complete Command Idle State.
Puts the OA 5000 into the Operation Complete Query Idle State.
Returns the instrument settings to those listed on page 3---24.
The *RST command does not alter the following:
H
H
H
H
H
H
H
H
The state of the IEEE Std 488.1 interface.
The selected IEEE Std 488.1 address of the OA 5000.
Calibration data that affects device specifications.
The Output Queue.
The Standard Status Register Enable setting.
The Standard Event Status Enable setting.
The Power-on status clear flag setting.
HEADer and VERBose settings.
*SRE
The *SRE (Service Request Enable) command sets and queries the bits in
the Service Request Enable Register (SRER). For a complete discussion of
the use of these registers, see page 3---35.
ALLev?, *CLS, DESE, *ESE, *ESR, EVENT?, EVMSG?, EVQty?, *PSC,
*STB.
Related Commands:
Syntax:
*SRE <NRf>
*SRE?
<Space>
?
<NRf>
*SRE
<NRf> is a value in the range from 0 to 255. The binary bits of the SRER are
set according to this value. Using an out-of-range value causes an execution
error.
Arguments:
The power-on default for SRER is 0 if *PSC is 1. If *PSC is 0, the SRER
maintains its value through a power cycle.
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Commands
*SRE 48
sets the bits in the SRER to 00110000 binary.
Examples:
*SRE?
might return a value of 32, showing that the bits in the SRER have the
binary value 00100000.
*STB? (Query Only)
The *STB? (Read Status Byte) query returns the Status Byte Register (SBR)
using the Master Summary Status (MSS) bit. For a complete discussion of
the use of these registers, see page 3---35.
ALLev?, *CLS, DESE, *ESE, *ESR, EVENT?, EVMSG?, EVQty?, *SRE.
Related Commands:
Syntax:
*STB?
*STB
?
*STB?
Examples:
might return the value 96, showing that the STB contains the binary
value 01100000.
STORe (Store Attenuation)
The STORe command sets or reads the value of stored positions 1 or 2.
Using the command form (for example, STOR1) without a value specified
stores the current attenuation in the specified location.
RECall
Related Commands:
Syntax:
STORe{1|2}?
STORe{1|2}
STORe{1|2} <NRf>
?
1
2
STORe
<Space>
<NRf>
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Commands
<NRf> specifies the attenuation value to be stored. The range for the attenu-
ation value is 0 ≤ <NRf> ≤ 60.00. All attenuation values associated with the
STORe command and query forms are in absolute dB and never include the
REFERENCE value, even if the front panel display shows that the OA 5000 is
set to ATT-REF mode.
Arguments:
Examples:
STORE1?
returns the attenuation value stored in register 1, in the form:.
:STORE1 <NRf>
STORE1 20.00
sets the attenuation value in stored register 1 to 20.00 dB.
STORE2
stores the current attenuation value in stored register 2.
*TST? (Query Only)
The *TST? (Self-Test) query runs the OA 5000 internal self-test and reports
the results. The self-test does not require operator interaction and does not
create bus conditions that violate IEEE Std 488.1/488.2 standards. When
complete, the OA 5000 returns to the state it was in just prior to the self-test.
The test response is a value <NR1> as described in Table 3-7.
*TST?
Syntax:
*TST
?
NOTE
The *TST? query can take 5 seconds or more to respond.
Table 3-7: Results from *TST?
<NR1>
Meaning
0
Test completed with no errors detected
ROM checksum error
Non-volatile RAM is bad
System timer is bad
101, 102
104
115
401
Calibration EEPROM is bad
Calibration needed
410, 411
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Commands
NOTE
If an error is detected, *TST? stops and returns an error code and
does not complete any remaining tests. It also places a device
dependent event in the event queue.
*TST?
Examples:
might return the value 115, indicating that the system timer is not work-
ing correctly.
VERBOSE
The VERBOSE command sets and queries the Verbose Header State that
controls the length of headers on query responses. This command does not
affect IEEE Std 488.2 Common Commands (those starting with an asterisk).
HEADER, *LRN?.
Related Commands:
Syntax:
VERBOSE { ON | OFF | <NRf> }
VERBOSE?
ON
<Space>
OFF
<NRf>
VERBOSE
?
ON or <NRf> ¸ 0 sets the Verbose Header State TRUE, which returns
full-length headers for applicable setting queries.
Arguments:
Examples:
OFF or <NRf> = 0 sets the Verbose Header State FALSE, which returns
minimum-length headers for applicable setting queries.
VERBOSE ON
sets the Verbose Header State TRUE.
VERBOSE?
might return the value 1, showing that the Verbose Header State is
TRUE.
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Commands
*WAI (No Query Form)
The *WAI (Wait) command prevents the OA 5000 from executing further
commands or queries until all pending operations finish.
*OPC, ADJusting?.
Related Commands:
Syntax:
*WAI
*WAI
WAVelength
This commands set or queries the wavelength used by the instrument when
determining the equivalent attenuator positioning for a given attenuation.
N/A
Related Commands:
Syntax:
WAVelength <NRf>
WAVelength?
<Space>
<NRf>
WAVelength
?
The valid range for the wavelength argument is 600 nm to 1700 nm. Default
units are always in nanometers with N (for nano or 1E---09) and U (for micro
or 1E---06) accepted as multipliers; M (for meters) is also an acceptable term
(see examples below).
Arguments:
Examples:
WAV?
returns the value of wavelength to which the OA 5000 is set. An example
response is:
:WAVELENGTH 1300
WAV 1300
sets the wavelength to 1300 nm.
WAV 1300NM
sets the wavelength to 1300 nm.
WAV 1.3UM
sets the wavelength to 1300 nm.
WAV 1.3E-09M
sets the wavelength to 1300 nm.
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Status and Events
The OA 5000 provides a status and event reporting system for the GPIB
interfaces. This system informs you of certain significant events that occur
within the OA 5000.
The OA 5000 status handling system consists of five 8-bit registers and two
queues. This section describes these registers and components and ex-
plains how the event handling system operates.
The registers in the event handling system fall into two functional groups:
Registers
H
The Standard Event Status Register (SESR) and the Status Byte Regis-
ter (SBR) contain information about the status of the OA 5000. These
registers are therefore called the Status Registers.
H
The Device Event Status Enable Register (DESER), the Event Status
Enable Register (ESER), and the Service Request Enable Register
(SRER) determine whether selected types of events are reported to the
Status Registers and the Event Queue. These three registers are called
the Enable Registers.
Status Registers
The Standard Event Status Register (SESR) and the Status Byte Register
(SBR) record certain types of events that may occur while the OA 5000 is in
use. These registers are defined by IEEE Std 488.2-1987. Refer also to
Figure 3-6 and Table 3-8.
Each bit in a Status Register records a particular type of event, such as an
execution error or service request. When an event of a given type occurs,
the bit that represents that type of event is set to a value of one. (You can
disable bits so that they ignore events and remain at zero; see the Enable
Registers section on page 3---37.) Reading the status registers tells you
what types of events have occurred.
The Standard Event Status Register (SESR) — The SESR, shown in
Figure 3-6, records eight types of events that can occur within the OA 5000.
Use the *ESR? query to read the SESR register. Reading the register clears
the bits of the register so that the register can accumulate information about
new events.
7
6
5
4
3
2
1
0
PON URQ CME EXE DDE QYE RQC OPC
Figure 3-6: The Standard Event Status Register (SESR)
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Status and Events
Table 3-8: SESR Bit Functions
Function
Bit
7 (MSB)
6
PON (Power On). Shows that the OA 5000 was powered on.
URQ (User Request). Shows that the Remote button was
pressed.
5
4
CME (Command Error). Shows that an error occurred while
the OA 5000 was parsing a command or query. Command
error messages are listed in Table 3-11 on page 3---41.
EXE (Execution Error). Shows that an error occurred while
the OA 5000 was executing a command or query. Execution
error messages are listed in Table 3-12 on page 3---42.
3
2
DDE (Device Error). Shows that a device error occurred. De-
vice error messages are listed in Table 3-13 on page 3---43.
QYE (Query Error). Shows that either an attempt was made
to read the Output Queue when no data was present or
pending, or that data in the Output Queue was lost.
1
RQC (Request Control). Not used.
0 (LSB)
OPC (Operation Complete). Shows that the operation is com-
plete. This bit is set by the *OPC command.
The Status Byte Register (SBR) — shown in Figure 3-7, records wheth-
er output is available in the Output Queue, whether the OA 5000 requests
service, and whether the SESR has recorded any events.
Use a Serial Poll or the *STB? query to read the contents of the SBR. Refer
to Table 3-9. The bits in the SBR are set and cleared depending on the
contents of the SESR, the Event Status Enable Register (ESER), and the
Output Queue. (When you use a Serial Poll to obtain the SBR, bit 6 is the
RQS bit. When you use the *STB? query to obtain the SBR, bit 6 is the MSS
bit.)
6
RQS
7
5
4
3
2
1
0
—
ESB MAV
—
—
—
—
6
MSS
Figure 3-7: The Status Byte Register (SBR)
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Status and Events
Table 3-9: SBR Bit Functions
Bit
Function
Not used (always 0).
7 (MSB)
6
RQS (Request Service ), obtained from a serial poll. Shows
that the OA 5000 requests service from the GPIB controller.
6
MSS (Master Status Summary), obtained from *STB? query.
Summarizes the ESB and MAV bits in the SBR.
5
ESB (Event Status Bit). Shows that status is enabled and
present in the SESR.
4
MAV (Message Available). Shows that output is available in
the Output Queue.
3 --- 0
Not used (always 0).
Enable Registers
The DESER, ESER, and SRER allow you to select which events are reported
to the Status Registers and the Event Queue. Each Enable Register acts as
a filter to a Status Register (the DESER also acts as a filter to the Event
Queue), and can prevent information from being recorded in the register or
queue.
Each bit in an Enable Register corresponds to a bit in the Status Register it
controls. In order for an event to be reported to its bit in the Status Register,
the corresponding bit in the Enable Register must be set to one. If the bit in
the Enable Register is set to zero, the event is not recorded.
The bits in the Enable Registers are set using various commands. The
Enable Registers and the commands used to set them are described below.
The Device Event Status Enable Register (DESER) — is shown in
Figure 3-8. This register controls which types of events are reported to the
SESR and the Event Queue. The bits in the DESER correspond to those in
the SESR, as described earlier.
Use the DESE command to enable and disable the bits in the DESER. Use
the DESE? query to read the DESER.
7
6
5
4
3
2
1
0
PON URQ CME EXE DDE QYE RQC OPC
Figure 3-8: The Device Event Status Enable Register (DESER)
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Status and Events
The Event Status Enable Register (ESER) — is shown in Figure 3-9. It
controls which types of events are summarized by the Event Status Bit
(ESB) in the SBR.
Use the *ESE command to set the bits in the ESER, and use the *ESE?
query to read it.
7
6
5
4
3
2
1
0
PON URQ CME EXE DDE QYE RQC OPC
Figure 3-9: The Event Status Enable Register (ESER)
The Service Request Enable Register (SRER) — is shown in Figure
3-10. It controls which bits in the SBR generate a Service Request and are
summarized by the Master Status Summary (MSS) bit.
Use the *SRE command to set the SRER. Use the SRE? query to read it.
The RQS bit remains set to one until either the Status Byte Register is read
with a Serial Poll or the MSS bit changes back to a zero.
7
6
5
4
3
2
1
0
—
—
ESB MAV
—
—
—
—
Figure 3-10: The Service Request Enable Register (SRER)
The Enable Registers and the *PSC Command
The *PSC command controls the contents of the Enable Registers at power-
on. Sending *PSC 1 sets the Enable Registers at power on as follows:
H
H
H
DESER 255 (equivalent to a DESe 255 command)
ESER 0 (equivalent to an *ESE 0 command)
SRER 0 (equivalent to an *SRE command)
Sending *PSC 0 lets the Enable Registers maintain their values in nonvola-
tile memory through a power cycle.
NOTE
To enable the PON (Power On) event to generate a Service Re-
quest, send *PSC 0, use the DESe and *ESE commands to enable
PON in the DESER and ESER, and use the *SRE command to
enable bit 5 in the SRER. Subsequent power-on cycles will gener-
ate a Service Request.
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Status and Events
The OA 5000 status and event reporting system contains two queues: the
Output Queue and the Event Queue.
Queues
The Output Queue
The Output Queue stores up to 8000 bytes of a query response while it is
waiting to be output. The Output Queue is emptied each time a new com-
mand or query message is received, so that any query response must be
read before the next command or query is sent, or responses to earlier
queries will be lost, and an error may result.
The Event Queue
The Event Queue stores detailed information on up to 32 events. If more
than 32 events stack up in the Event Queue, the 32nd event is replaced by
event code 350, “Too many events.”
Read the Event Queue with either the EVENT? query (which returns only the
event number) or with the EVMSG? query (which returns the event number
and a text description of the event). Reading an event removes it from the
queue.
Before reading an event from the Event Queue, you must use the *ESR?
query to read the summary of that event from the SESR. This makes the
events summarized by the *ESR? read available to the EVENT? and
EVMSG? queries, and empties the SESR.
Reading the SESR erases any events that were summarized by a previous
*ESR? read but not read from the Event Queue. Events that follow an *ESR?
read are put in the Event Queue but are not available until *ESR? is used
again.
Figure 3-11, on page 3---40, shows how to use the status and event handl-
ing system. In the explanation that follows, numbers in parentheses refer to
numbers in Figure 3-11.
Event Handling
Sequence
When an event occurs, a signal is sent to the DESER (1). If that type of
event is enabled in the DESER (that is, if the bit for that event type is set to
1), the appropriate bit in the SESR is set to one and the event is recorded in
the Event Queue (2). If the corresponding bit in the ESER is also enabled
(3), then the ESB bit in the SBR is set to one (4).
When output is sent to the Output Queue, the MAV bit in the SBR is set to
one (5).
When a bit in the SBR is set to one and the corresponding bit in the SRER is
enabled (6), the MSS bit in the SBR is set to one and a service request is
generated (7).
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Status and Events
1
7
6
5
4
3
2
1
0
Device Event Status Enable Register
(DESER)
PON URQ CME EXE DDE QYE RQC OPC
2
7
6
5
4
3
2
1
0
Standard Event Status Register
(SESR)
Event
Queue
PON URQ CME EXE DDE QYE RQC OPC
Event
Event
Event
3
7
6
5
4
3
2
1
0
Event Status Enable Register
(ESER)
Output
Queue
PON URQ CME EXE DDE QYE RQC OPC
Byte
Byte
Byte
4
5
6
RQS
7
5
4
3
2
1
0
Status Byte Register
(SBR)
—
ESB MAV
—
—
—
—
6
MSS
6
7
7
6
5
4
3
2
1
0
Service Request Enable Register
(SRER)
—
—
ESB MAV
—
—
—
—
Figure 3-11: Status and Event Handling Process
Whenever a command is issued that results in a conflict, an event is gener-
ated on the EXE bit (bit 4).
Conflicts
You can avoid generating this event if you concatenate commands so that
the conflict is resolved when the command is completed. For example, when
setting the attenuator in DBR mode, always make sure that the REF com-
mand precedes the ATT:DBR command or an execution warning may result.
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Status and Events
Tables 3-10 through 3-15 list all the programming interface messages the
OA 5000 generates in response to commands and queries.
Messages
For most messages, a secondary message from the OA 5000 gives more
detail about the cause of the error or the meaning of the message. This
message is part of the message string, and is separated from the main
message by a semicolon.
Each message is the result of an event. Each type of event sets a specific bit
in the SESR, and is controlled by the equivalent bit in the DESER. Thus,
each message is associated with a specific SESR bit. In the message tables
that follow, the associated SESR bit is specified in the table title, with excep-
tions noted with the error message text.
Table 3-10 shows the messages when the system has no events or status to
report. These have no associated SESR bit.
Table 3-10: No Event Messages
Code
Message
0
1
No events to report --- queue empty
No events to report --- new events pending *ESR?
Table 3-11 shows the error messages generated by improper command
syntax. Check that the command is properly formed and that it follows the
rules in the Command Syntax chapter starting on page 3---5.
Table 3-11: Command Error Messages — CME Bit 5
Code
100
101
102
103
104
105
106
108
109
110
111
112
Message
Command error
Invalid character
Syntax error
Invalid message or unit separator
Data type error
GET not allowed
Invalid program data separator
Parameter not allowed
Missing parameter
Command header error
Header separator error
Program mnemonic too long
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Status and Events
Table 3-11: Command Error Messages — CME Bit 5 (Cont.)
Code
Message
113
118
120
121
123
124
128
130
131
134
138
140
141
144
148
150
151
158
160
161
168
Undefined header
Query not allowed
Numeric data error
Invalid character in number
Numeric overflow
Too many digits
Numeric data not allowed
Suffix error
Invalid suffix
Suffix too long
Suffix not allowed
Character data error
Invalid character data
Character data too long
Character data not allowed
String data error
Invalid string data
String data not allowed
Block data error
Invalid block data
Block data not allowed
Table 3-12 lists the execution errors that are detected during execution of a
command. In these error messages, you should read “macro” as “alias.”
Table 3-12: Execution Error Messages — EXE Bit 4
Code
200
Message
Execution error
Parameter error
Settings in conflict
220
221
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Table 3-12: Execution Error Messages — EXE Bit 4 (Cont.)
Code
222
Message
Data out of range
Too much data
223
Table 3-13 lists the device errors that can occur during operation of the
OA 5000. These errors may indicate that the OA 5000 needs repair.
Table 3-13: Device Error Messages — DDE Bit 3
Code
300
310
313
315
350
Message
Internal error
System error
Calibration memory lost
Configuration memory lost
Too many events (Does not set DDE bit)
Table 3-14 lists the system event messages. These messages are generated
whenever certain system conditions occur.
Table 3-14: System Event Messages — QYE Bit 2
Code
401
402
403
410
420
430
440
Message
Power on --- PON Bit 7
Operation complete --- OPC Bit 0
User request --- URQ Bit 6
Query INTERRUPTED
Query UNTERMINATED
Query DEADLOCKED
Query UNTERMINATED after indefinite response
Table 3-15 lists warning messages that do not interrupt the flow of command
execution. These notify you that you might get unexpected results.
Table 3-15: Execution Warning Messages — EXE Bit 4
Code
Message
500
Execution warning
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Status and Events
3 --- 4 4
Programming
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Appendix A: Accessories
Some accessories are included with the OA 5000. If you wish to purchase
optional accessories, or purchase additional standard accessories, see a
Tektronix products catalog or contact your local Tektronix field representa-
tive.
H
This manual, the OA 5000 Optical Attenuator User Manual (Tektronix part
Standard
Accessories
number 070-7612-03).
H
H
The TM 5003 Power Module, Tektroninx part number 620-0057-00
Two universal optical input and output connector kits, Tektronix part
number 020-1885-00.
H
Two blank plug-in panels, Tektronix part number 016-0195-05
The optional accessories appropriate for your instrument depend on which
OA 5000 Optical Attenuator you purchased.
Optional
Accessories
Optical Cables, Single Mode, 2 meter, 8/125 micron
H
H
H
H
H
FC/PC to Diamond 2.5, Tektronix part number 174-1497-00.
FC/PC to Diamond 3.5, Tektronix part number 174-1385-00.
FC/PC to ST, Tektronix part number 174-1386-00.
FC/PC to FC/PC, Tektronix part number 174-1387-00.
FC/PC to Biconic, Tektronix part number 174-1388-00.
Optical Cables, Multimode, 2 meter, 62.5/140 micron
H
H
H
FC/PC to Biconic, Tektronix part number 174-2323-00.
FC/PC to SMA906, Tektronix part number 174-2324-00.
FC/PC to FC/PC, Tektronix part number 174-2322-00.
Optical Cables, Multimode, 2 meter, 100/140 micron
(Note: at the time of publication, the 100 ꢀm cables listed below did not
utilize physical contact connectors)
H
H
H
FC to SMA, Tektronix part number 174-0878-00.
ST to SMA, Tektronix part number 174-0876-00.
Diamond 2.5 to SMA, Tektronix part number 174-1303-00.
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Appendix A: Accessories
A --- 2
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Appendix B: Specifications
The performance characteristics described in this appendix (Tables A-1
through A-3) are valid under the following conditions:
H
The instrument must have been calibrated at an ambient temperature
between +20_ C and +30_ C.
H
H
The instrument must have had a warm-up period of at least 20 minutes.
All optical connections to the instrument are made using physical con-
tact connectors. Tektronix offers limited selection of fiber optic jumper
cables which utilize physical contact on the connector ends (for exam-
ple: Tektronix part number 174-1387-00, see Appendix A).
H
Both input and output connectors have been cleaned as described on
page A---15.
Table A-1: Optical Characteristics
Characteristic
Specification
Wavelength Range
OA 5002
1100 --- 1600 nm
750 --- 1600 nm
OA 5012/22/32
Input
OA 5002
OA 5012
OA 5022
OA 5032
Single Mode Fiber
50 ꢀm Multimode Fiber
62.5 ꢀm Multimode Fiber
100 ꢀm Multimode Fiber
Insertion Loss
750 --- 1100 nm
1100---1350 nm
1350---1600 nm
≤ 4.0 dB (OA 5012/22/32 only)
≤ 2.0 dB
≤ 2.5 dB
Return Loss
OA 5002
OA 5012/5022/5032
≤ --- 45 dB
≤ --- 25 dB
Attenuation Range
OA 5002
1100 --- 1350 nm
1350---1600 nm
OA 5012/22/32
750---1350 nm
1350---1600 nm
≥ 60 dB (calibrated, 0.01 dB step size)
≥ 50 dB (calibrated, 0.01 dB step size)
≥ 60 dB (calibrated, 0.01 dB step size)
≥ 50 dB (calibrated, 0.01 dB step size)
Maximum Attenuation
OA 5002/5012/5022
OA 5032
≥ 100 dB (shutter activated)
≥ 90 dB (shutter activated)
Repeatability
0.05 dB
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Appendix B: Specifications
Table A-1: Optical Characteristics (Cont.)
Characteristic
Specification
Linearity
0.1 dB max (typically 0.05 dB)
Accuracy
OA 5002
1310 20 nm
1550 20 nm
≤
≤
≤
0.15 dB (typically ≤ 0.05 dB)
0.15 dB (0 to 40 dB) (typically ≤ 0.05 dB)
0.20 dB (≥40 dB)
All other wavelengths
OA 5012/5022/5032
Typically ≤ 0.25 dB
850 20 nm
1310 20 nm
1550 20 nm
All other wavelengths
≤
≤
≤
0.20 dB (typically ≤ 0.05 dB)
0.20 dB (typically ≤ 0.05 dB)
0.20 dB (typically ≤ 0.05 dB)
Typically ≤ 0.25 dB
Table A-2: Mechanical Characteristics
Characteristic
Specification
Net Weight
1.3 kg (2.86 lb.)
External Dimensions
Height
Width
14.0 cm (5.5 in.)
23.4 cm (9.2 in.)
44.4 cm (17.4 in.)
Length
Table A-3: Environmental Performance
Specification
Characteristic
Temperature
Operating
0_ C to +50_ C (32_ F to 122_ F)
Nonoperating
(storage)
--- 40_ C to +70_ C ( --- 40_ F to 160_ F)
(Meets MIL---T---28800D, class 5.)
Altitude
Operating
4.6 km (15,000 ft.)
Nonoperating
15 km (50,000 feet)
(Exceeds MIL---T---28800D, class 5.)
A --- 4
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Appendix B: Specifications
Table A-3: Environmental Performance (cont.)
Characteristic
Specification
Humidity
Operating and
Nonoperating
95% RH: 11_ C to 30_ C (52_ F to 86_ F)
75% RH: 11_ C to 40_ C (52_ F to 104_ F)
45% RH: 11_ C to 50_ C (52_ F to 122_ F)
(Exceeds MIL---T---28800D, Class 5, noncon-
densing)
Vibration1
0.38 mm (0.015 in.) p-p, 5 Hz to 55 Hz, 75 min-
utes. Meets MIL---T---28800D, Class 5, when
installed in qualified power modules2.
1
Requires retainer clip
Refer to TM5000 Power Module specifications
Without power module
2
3
Shock1
30 g’s, (1/2 sine), 11 ms duration, 3 shocks in
each direction along 3 major axes, 18 total
shocks. Meets MIL---T---28800D, Class 5, when
installed in qualified power modules.
Bench Handling3
12 drops from 45_, 4 in. or equilibrium, whichev-
er occurs first. Meets MIL---T---28800D, Class 5,
when installed in qualified power modules2, and
IEC 348 (Electronic measuring apparatus).
Packaged Product Vi-
bration and Shock1
The packaged product qualifies under the Na-
tional Safe Transit Association’s Preshipment
Test Procedures, Project 1A---B---1 and
1A --- B --- 2.
Electrical Discharge
8 kV maximum discharge applied to operating
instrument from an ESD source per IEC 801---2
(150 Ω/150 pF)
1
Requires retainer clip
2
3
Refer to TM5000 Power Module specifications
Without power module
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Appendix B: Specifications
A --- 6
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Appendix C: Interface Specifications
This appendix describes details of the remote interface of the Optical
Attenuator, that is, the GPIB. Normally, you will not need this information to
use the OA 5000, but the information is useful when connecting to control-
lers of unusual configuration.
This appendix also contains general information that pertains to program-
ming with both interfaces. This information includes a chart of the ASCII
character set and a list of reserved words.
Table A-4 shows the standard interface messages that are supported by the
OA 5000.
Interface Messages
Table A-4: OA 5000 Standard Interface Messages
Message
GPIB
Yes
No
DCL
GET
GTL
Yes
Yes
No
LLO
PPC
PPD
No
PPE
No
PPU
No
SDC
Yes
Yes
Yes
Yes
Yes
Yes
Yes
SPD
SPE
UNL
UNT
Listen Addresses
Talk Addresses
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Appendix C: Interface Specifications
Table A-5 shows the character set used for all messages to and from the
OA 5000. This is identical to standard ASCII.
Character Set
(ASCII Chart)
Table A-5: The ASCII Character Set
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
NUL
DLE
space
0
@
P
‘
p
0
1
16
17
32
48
49
64
65
80
81
96
97
112
113
SOH
STX
ETX
EOT
ENQ
ACK
BEL
BS
DC1
DC2
DC3
DC4
NAK
SYN
ETB
CAN
EM
!
”
1
2
3
4
5
6
7
8
9
:
A
B
C
D
E
F
Q
R
S
T
U
V
W
X
Y
Z
[
a
b
c
d
e
f
q
r
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
2
3
18
19
20
21
22
23
24
25
26
27
28
29
30
31
50
51
52
53
54
55
56
57
58
59
60
61
62
63
66
67
68
69
70
71
72
73
74
75
76
77
78
79
82
83
84
85
86
87
88
89
90
91
92
93
94
95
98
99
114
115
116
117
118
119
120
121
122
123
124
125
126
#
$
%
&
’
s
t
4
100
101
102
103
104
105
106
107
108
109
110
111
u
v
w
x
y
z
5
6
G
H
I
g
h
i
7
(
8
HT
)
9
LF
SUB
ESC
FS
*
+
,
J
j
10
11
12
13
14
15
VT
;
K
L
k
l
{
FF
<
=
>
?
\
|
CR
GS
---
.
M
N
O
]
m
n
o
}
SO
RS
^
_
~
SI
US
/
rubout
127
A --- 8
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Appendix C: Interface Specifications
The OA 5000 supports many GPIB function subsets, as listed below. Some
of the listings describe subsets that the OA 5000 does not support.
GPIB Function
Subsets
H
H
H
SH1 (Source Handshake). The OA 5000 can transmit multi-line mes-
sages across the GPIB.
AH1 (Acceptor Handshake). The OA 5000 can receive multi-line mes-
sages across the GPIB.
T6 (Talker). The OA 5000 becomes a talker when its talk address is sent
with the ATN (Attention) line asserted. It ceases to be a talker when
another device’s talk address is sent with ATN asserted. The OA 5000
has no talk-only capability.
H
L4 (Listener). The OA 5000 becomes a listener when its listen address is
sent with the ATN (Attention) line asserted. The OA 5000 does not have
listen-only capability.
H
H
H
SRQ (Service Request). The OA 5000 asserts the SRQ (Service Re-
quest) line to notify the controller when it requires service.
RL1 (Remote/Local). The OA 5000 responds to both the GTL (Go To
Local) and LLO (Local Lock Out) interface messages.
PPO (Parallel Poll). The OA 5000 has no parallel poll capability. It does
not respond to the following interface messages: PPC, PPD, PPE, and
PPU. The OA 5000 does not send out a status message when the ATN
(Attention) and EOI (End of Instruction) lines are asserted simultaneous-
ly.
H
H
DCL (Device Clear). When acting as a listener, the OA 5000 responds to
the DCL (Device Clear) and SDC (Selected Device Clear) interface
messages.
DT (Device Trigger). The OA 5000 does not respond to the GET (Group
Execute Trigger) interface message.
H
H
C0 (Controller). The OA 5000 cannot control other devices.
E2 (Electrical). The OA 5000 uses tri-state buffers to provide optimal
high-speed data transfer.
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Appendix C: Interface Specifications
A --- 1 0
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Appendix D: Using the *OPC
Query/Command
When you are using the OA 5000 in an automated test environment, it is
important that you be aware of the finite times for certain OA 5000 com-
mands to complete. For example: suppose you develop an automated test
in which the attenuator is adjusted over the GPIB bus via the ATT:DB n
command. After each adjustment by the attenuator, you might then make an
automated reading from an optical power meter (such as the Tektronix
OCP 5502). In such a sequence, it is important that you not initiate the
reading from the optical power meter before the attenuator has completed
all adjustments and has come to a stable position (that is, the ATT ADJ
indicator is no longer illuminated).
Below is an example that illustrates the use of GPIB commands and queries
utilizing the *OPC? query/command. In this example, queries to other instru-
ments (such as the power meter in this example) are not made until all of
the OA 5000’s pending operations have completed.
Example: A command is sent to the OA 5000 to change attenuation to
45 dB; the command is immediately followed by an *OPC? query across the
GPIB bus to the same OA 5000.
1. Write to the OA 5000 GPIB address: ATT:DB 45.00; *OPC?
2. Read from OA 5000 GPIB address: 1
Depending on the previous attenuation setting of the OA 5000, several
seconds may be required before the ATT:DB command is completed and
the *OPC? produces a “1” in the OA 5000 GPIB output queue. After the
*OPC? query is sent to the OA 5000, the programmer should immediately
attempt a GPIB read instruction from the controller. The programmer’s
controller should wait until the OA 5000 finishes all adjustments and the
*OPC query provides a “1” to be read.
NOTE
It is important that you remember to set the time-out of the control-
ler’s GPIB READ instruction to be greater than the longest time
possible for the OA 5000 to make any adjustments (up to five
seconds may be required to make large changes to attenuation
settings).
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Appendix D: Using the *OPC Query/Command
You can also have the OA 5000 set the OPC bit of the SESR by using the
command form of *OPC instead of the query form. By setting the OPC bit to
“1” via an *OPC command, an SRQ will be generated assuming the user
has enabled the proper register bits.
H
Advanced programmers can develop other methods to accomplish the
set-and-wait-until-complete routine utilizing the event queues and status
registers provided in the OA 5000.
A --- 1 2
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Appendix E: Packing for Shipment
If you ship the OA 5000, pack it in the original shipping carton and packing
material. If the original packing material is not available, package the instru-
ment as follows:
Step 1: Obtain a corrugated cardboard shipping carton with inside
dimensions at least 15 cm (6 in) taller, wider, and deeper than the
OA 5000. The shipping carton must be constructed of cardboard with
375 pound test strength.
Step 2: If you are shipping the OA 5000 to a Tektronix field office for
repair, attach a tag to the OA 5000 showing the instrument owner and
address, the name of the person to contact about the instrument, the
instrument type, and the serial number.
Step 3: Wrap the OA 5000 with polyethelene sheeting or equivalent
material to protect the finish.
Step 4: Cushion the OA 5000 in the shipping carton by tightly packing
dunnage or urethane foam on all sides between the carton and the
OA 5000. Allow 7.5 cm (3 in) on all sides, top, and bottom.
Step 5: Seal the shipping carton with shipping tape or an industrial
stapler.
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Appendix E: Packing for Shipment
A --- 1 4
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Appendix F: Maintenance
This appendix describes how to perform routine maintenance on the
OA 5000 Series Optical Attenuators. There are no user-serviceable parts in
the OA 5000. Should your instrument need service, contact your nearest
Tektronix service representative.
The following maintenance procedures are discussed in this chapter.
H
H
Cleaning the Optical Port
Changing Optical Port Connectors
If the OA 5000 performance appears degraded, the optical fiber and optical
port may be dirty. Clean the fiber connector with a clean cloth. To clean an
optical port, perform the following steps:
Cleaning the
Optical Ports
1. Turn the power supply off or pull the OA 5000 out of the power module.
2. Use a Phillips screwdriver to remove the four screws that secure the
bulkhead connector to the front panel (see Figure A-1 on page A---16).
3. Gently pull the bulkhead out of the unit and unscrew the fiber connector.
Be careful not to pull beyond the fiber slack. If there is insufficient slack
or if you accidently push the disconnected fiber back into the instru-
ment, then perform the following three steps:
a. Using a flat-blade screwdriver, turn the securing screw on the right-
side cover 90_ counter-clockwise and remove the side cover (See
Figure A-1).
b. You will now have access to the optical fiber. Unscrew it from the
bulkhead if necessary or push it back through the front panel.
c. Reinstall the cover when finished. Turn the securing screw to lock
the side cover.
4. Using a soft, lint-free cloth with a high-quality glass cleaner, clean the tip
of the fiber cable.
5. If available, use low-pressure compressed air or canned air to blow any
dirt out of the bulkhead connector. If compressed air is not available,
then the bulkhead will have to be taken apart and cleaned. Refer to the
Changing the Optical Port Connectors procedure, on page A---17, for
information about bulkhead disassembly.
6. After cleaning the bulkhead, reconnect the fiber and install the bulk-
head. Be sure to reinstall the dust cover chain.
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Appendix F: Maintenance
NOTE
To keep cleaning to a minimum, install the dust cover when no fiber
is connected to the optical port.
Securing Screw
Optical Fiber Connector
Figure A-1: Removing the Optical Bulkhead Connector
A --- 1 6
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Appendix F: Maintenance
The OA 5000 is shipped with the FC connector bulkhead and dust cover
installed. If you wish to change to the ST, DIN 47256, or SC connectors,
perform the following procedure.
Changing the
Optical Port
Connectors
1. Turn the power supply off first and then pull the OA 5000 out of the
power module.
2. Use a Phillips screwdriver to remove the four screws that secure the
bulkhead connector to the front panel (see Figure A-1).
3. Gently pull the bulkhead out of the unit and unscrew the fiber connector.
Be careful not to pull beyond the fiber slack. If there is insufficient slack
or if you accidently push the disconnected fiber back into the instru-
ment, then perform the following three steps:
a. Using a flat-blade screwdriver, turn the securing screw on the right-
side cover 90_ counter-clockwise and remove the side cover (See
Figure A-1).
b. You will now have access to the optical fiber. Unscrew it from the
bulkhead if necessary or push it back through the front panel.
c. Reinstall the side cover when finished. Turn the securing screw to
lock the side cover.
4. Disassemble the bulkhead as shown in Figures A-2 through A-5.
Figure A-2: FC Optical Bulkhead Assembly
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Appendix F: Maintenance
Figure A-3: ST Optical Bulkhead Assembly
Figure A-4: DIN 47256 Optical Bulkhead Assembly
A --- 1 8
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Appendix F: Maintenance
Figure A-5: SC Optical Bulkhead Assembly
5. Replace the current bulkhead with the one you wish to use and re-as-
semble.
6. Installation is the reverse of steps 1 through 3.
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A --- 2 0
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Appendix G: Product Verification
Refer to Table 4-1 for a list of the equipment required to verify the perfor-
mance of your OA 5000 Series instrument.
Equipment List
Table 4-1: Equipment Required for Performance Verification
Description
Minimum Use Specifications
Recommendation
850 nm
Laser source
CW, 850 20 nm, actual wavelength Fotec S785
known within 1 nm; >500 ꢀW into
50/125 ꢀm fiber; <0.02 dB/minute
stability1
1310 nm
Laser source
CW, 1310 20 nm, actual
wavelength known within 1 nm;
>1 mW into SM fiber; <0.02 dB/
minute stability1
Advantest
Q81211/Q8221
1550 nm
Laser source
CW, 1550 20 nm, actual
wavelength known within 1 nm;
>500 ꢀW into SM fiber; <0.02
dB/minute stability1
Advantest
Q81212/Q8221
(1310 and 1550
nm) Optical
power meter
with long
(0.025 dB + 0.3 pW) linearity, ---90 Agilent/HP
to +3 dBm; noise (p---p) < 0.5 pW; 81532A/8153A
accepts 9/125 to 100/140 ꢀm fiber
wavelength
sensor
(850 nm)
Optical power
(0.025 dB + 0.3 pW) linearity,
---90 to +3 dBm; accepts 9/125 to
Agilent/HP
81530A/8153A
meter with short 100/140 ꢀm fiber
wavelength
sensor
OA 5002, 50 m long, if available, or a fiber as
Optical input fi- short as 1 m can be used;
ber, 1 each
9/125 ꢀm, FC/PC to FC/PC2
OA 5002,
1 to 5 m long, 9/125 ꢀm, FC/PC to
Tektronix
174-1387-00
Optical output fi- FC/PC2
ber, 1 each
OA 5012,
Optical input
and output fiber
1 to 5 m long, 50/125 ꢀm, FC/PC to
FC/PC2
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Appendix G: Product Verification
Table 4-1: Equipment Required for Performance Verification
Description
Minimum Use Specifications
Recommendation
OA 5022,
Optical input
and output fiber
1 to 5 m long, 62.5/125 ꢀm, FC/PC
to FC/PC2
Tektronix
174-2322-00
OA 5032,
Optical input
and output fiber
1 to 5 m long, 100/140 ꢀm, FC/PC
to FC/PC2
FC/FC adapter
Female to female
Tektronix
131-6252-00
1
Laser should have short coherence length (<1 m if possible) and multiple longitudinal
modes to minimize effects of polarization and reflection. If a DFB or tunable laser is used, it
should have a coherence control feature and optionally a polarization scrambler.
2
The fiber specifications assume that adapters on the test equipment and the DUT (device
under test) are FC/PC. Alternative adapters can be used with appropriate changes in the
fiber connectors.
Step 1: Insert the OA 5000 into a powered-down Tektronix TM 5000
Power Up
series Mainframe power supply.
H
Make certain that the OA 5000 is securely latched into the main-
frame.
Step 2: Turn the TM 5000 mainframe power on (via mainframe’s power
switch)
Step 3: A few seconds are required after mainframe power-up before
the OA 5000 displays become lit.
H
Once the displays become active, all LEDs and digital segments will
be lit for a couple of seconds; any segment which does not light up
during this time is either defective, burnt out, or is not connected.
H
This test can be invoked anytime after power up by pushing and
holding the ADDR(SET) button.
Step 4: The wavelength, attenuation, and display mode will power-up at
whatever values existed before the previous power-down; if the instru-
ment is being powered on for the first time the settings will be at their
factory default values (see manual for these default values).
A --- 2 2
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Appendix G: Product Verification
Step 1: Push the MODE button until ATT is backlit and -REF is not
Display Modes
backlit (these LEDs are green);
H
The MODE button itself should now be backlit (this LED is red).
Step 2: Push the MIN ATT button; this will cause the instrument to
adjust to zero dB (a few seconds may be needed to complete the ad-
justment if the previous setting was non-zero).
H
H
The MIN ATT button should itself be backlit
0.00 should be displayed in the ATTENUATION(dB) display
Step 3: Push the SET REF button.
H
The SET REF button should now be backlit; the MODE button
should not be backlit.
H
Check that the WAVELENGTH(nm) display is showing “SEt”.
Step 4: Adjust the numerical value displayed in the ATTENUATION(dB)
display by manipulating the COARSE and FINE knobs; the coarse knob
should increment or decrement the value by 1 dB per detent; the fine
knob should increment or decrement the value by 0.01 dB.
H
H
Set the display to read “--10.00”
Push the SET REF button again; the button will then be unlit and the
MODE should now be lit with the ATT only backlit.
Step 5: Push the MODE once again.
H
H
Check to see that “ATT” and “--- REF ” are both backlit
The ATTENUATION(dB) display should now read “10.00” (This is
because ATT=0.00;REF=---10.00; hence, the result
ATT---REF=0---(---10.00)=10.00)
H
H
Pushing the MODE button repeatedly will toggle the “--- REF ” back-
lighting on and off and the displayed attenuation will toggle between
“0.00” and “10.00”
Set the MODE so that the “ATT” only is backlit before going to the
next step.
Step 6: Push the WAVELENGTH button once.
H
The ATTENUATION(dB) display should read “SEt” and the
WAVELENGTH button will be backlit.
H
The COARSE and FINE knobs increment or decrement the value
displayed in the WAVELENGTH(nm) display; the coarse knob should
increment or decrement the wavelength value by 10 nm; the fine
knob should increment or decrement the value by 1 nm.
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Appendix G: Product Verification
H
H
Set the WAVELENGTH(nm) display to read “1300”.
Push the WAVELENGTH button once more; check that the button is
no longer backlit and that the MODE button is backlit. (After exiting
the wavelength mode, the instrument may require a second or two
to recalculate calibration for the new wavelength; the ATT ADJ light
next to the ATTENUATION(dB) display will briefly be backlit to indi-
cate this.)
Step 1: Push the ADDR(SET) button once.
GPIB Address Setting
H
The button should become backlit, the ATTENUATION display
should read “Addr”, and the WAVELENGTH display should show a
number from 0 to 30 or the word “OFF”.
Step 2: While in this mode, the coarse and fine knobs should increment
or decrement the displayed address value by 1; adjust the value, using
the knobs, to the address desired.
H
Check that when the value is adjusted above “30” that the word
“OFF” appears.
Step 3: Push the ADDR(SET) button once again while the desired
address is being displayed; the display mode should return to whatever
state the instrument was in before pushing the ADDR(SET) button.
NOTE
The address of the instrument is not actually updated until the
ADDR (SET) mode is exited.
Step 1: Enter the Wavelength set mode for the OA 5000 by pushing the
Attenuation Range
WAVELENGTH button so that the display reads “SEt”.
Step 2: Using the knobs, adjust the wavelength to read 1350 nm.
Step 3: Exit the Wavelength Set mode by pushing the WAVELENGTH
button again; the instrument will require a second to prepare the new
calibration tables (as indicated by the ATT ADJ briefly lighting up).
Step 4: Adjust the OA 5000 such that the display mode is showing
attenuation in dB with the ATT indicator lit and the ---REF indicator not lit.
Step 5: Using the knobs, increase the level of attenuation (turn the
coarse knob clockwise); keep increasing the level until the value reach-
es a maximum level and no longer increases. This value should exceed
60.00 dB.
A --- 2 4
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Appendix G: Product Verification
Step 6: Enter the Wavelength set mode for the OA 5000 by pushing the
WAVELENGTH button so that the top display reads “SEt”.
Step 7: Using the knobs, adjust the wavelength to read 1600 nm.
Step 8: Exit the Wavelength Set mode by pushing the WAVELENGTH
button again; the instrument will require a second to prepare the new
calibration tables (as indicated by the ATT ADJ briefly lighting up).
Step 9: Adjust the OA 5000 such that the display mode is showing
attenuation in dB with the ATT indicator lit and the ---REF indicator not lit.
Step 10: Using the knobs, increase the level of attenuation (turn the
coarse knob clockwise); keep increasing the level until the value reach-
es a maximum level and no longer increases. This value should exceed
50.00 dB.
Step 1: Set the optical power meter as follows (operating instructions
Shutter Attenuation
and the DISABLE
button
are for HP8153A):
H
H
H
Select the long wavelength power sensor.
Wavelength: actual wavelength ( 1 nm) of 1310 nm laser
Averaging: 1 s
Toggle the Mode key to display PARAM, and then press the Param
key to display T and set T to 1 s.
H
Displayed units: W (watts)
Step 2: Cover the sensor input and zero the power meter.
Step 3: Connect the 1310 nm laser to the OA 5000 input using the input
fiber specified in the equipment table.
Step 4: Connect the OA 5000 output to the sensor using the output
fiber specified in the equipment table.
NOTE
For the OA 5012, OA 5022, and OA 5032 the input fiber may have a
smaller core diameter than the one specified, as long as the laser
can couple into the fiber. For these models, the output fiber may
have a larger core diameter than the one specified, up to 100 ꢀm.
Step 5: Set the OA 5000:
H
H
H
Wavelength: actual wavelength ( 1 nm) of 1310 nm laser
Attenuation: 0 dB
Disable: off (unlit)
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Appendix G: Product Verification
Step 6: Set the laser to CW (unmodulated) mode, and set the laser
power level (if adjustable) to maximum, but not more than 2 mW. Turn
on the laser. The power meter reading should be at least 500 ꢀW.
Step 7: Set the power meter to dB relative (press the dB key), and set
the dB reference (press Disp-->Ref). The power meter should read
0.0 dB 0.1 dB.
Step 8: Set the OA 5000 DISABLE button to on (lit).
NOTE
The measurement in step 9 is near the noise floor of the power
meter, so it may be necessary to repeat the meter zero (with sensor
capped) and the measurement several times to get a valid result. If
an average reading lower than about ---97 dB can’t be obtained
(except for the OA 5032), it might be due to noise in the sensor. A
laser with a higher power output might be needed to improve the
range of the measurement.
Step 9: Verify the OA 5000 shutter attenuation by checking that average
(not peak) value of the power meter reading is ---100 dB or lower (more
negative), except ---90 dB or lower for OA 5032.
1310 nm:
NOTE
Insertion Loss,
Attenuation
Accuracy, and
Repeatability
Stable light levels must be maintained throughout the insertion loss,
attenuation accuracy, and repeatability tests. Use only fiber optic
connectors that are clean and in good condition. It may be neces-
sary to remove the OA 5000 bulkhead connectors and clean the
OA 5000 connectors and fibers (see Appendix F).
Step 1: Leave the fibers connected to the 1310 nm laser and the long
wavelength sensor. Disconnect the fibers from the OA 5000, and con-
nect the fibers together using an FC/FC adapter.
Step 2: Assure that the wavelength displays of the OA 5000 and the
power meter are set to the actual wavelength (not the nominal wave-
length) of the laser, within 1 nm.
Step 3: Set the power meter to W (watts) mode. The reading should be
700 ꢀW or more. Set the power meter to dB relative mode (press the
dB key), and set the dB reference (Disp-->Ref). The power meter
should read 0.0 dB 0.1 dB.
Step 4: Disconnect the fibers from the FC/FC adapter, and connect
them to the OA 5000.
A --- 2 6
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Appendix G: Product Verification
Step 5: Set the OA 5000 attenuation to 0 dB, and the DISABLE button
off (unlit).
Step 6: The power meter reading is the insertion loss of the OA 5000.
Check that the power meter reading is ---2.0 dB or higher (more posi-
tive).
NOTE
During the remaining steps, do not disturb the connections and
fibers.
Step 7: Set the dB reference (Disp-->Ref) at the power meter. The
power meter reading should be 0.00 dB within 0.01 dB.
Step 8: Set the OA 5000 to each of the settings in the table below, and
check that the power meter reads within the listed accuracy limits. At
30 dB, note the reading.
Step 9: Set the OA 5000 to 0 dB. Check that the power meter reads
0.00 dB within the repeatability specification ( 0.05 dB).
Step 10: Set the OA 5000 to 30 dB. Check that the power meter reads
the same as in step 8, within the repeatability specification ( 0.05 dB).
Step 11: If the readings in steps 9 and 10 do not meet the repeatability
specifications, check the connections, and repeat steps 7 to 10.
Table 4-2: Attenuation Accuracy at 1310 nm
OA 5002
OA 5012 / OA 5022 /
OA 5032
Attenuation
setting (dB)
Tolerance Limits (dB)
Tolerance Limits (dB)
10
20
30
40
50
60
---10.15 to ---9.85
---20.15 to ---19.85
---30.15 to ---29.85
---40.15 to ---39.85
---50.15 to ---49.85
---60.15 to ---59.85
---10.20 to ---9.80
---20.20 to ---19.80
---30.20 to ---29.80
---40.20 to ---39.80
---50.20 to ---49.80
---60.20 to ---59.80
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Appendix G: Product Verification
Step 1: Disconnect the fibers from the OA 5000 and 1310 nm laser.
Connect the 1550 nm laser to the input fiber and the long wavelength
sensor to the output fiber. Connect the fibers together using an FC/FC
adapter. Set the laser to CW (unmodulated) mode, and set the laser
power level (if adjustable) to maximum, but not more than 2 mW. Turn
on the laser.
1550 nm:
Insertion Loss,
Attenuation
Accuracy, and
Repeatability
Step 2: Set the wavelength displays of the OA 5000 and the power
meter to the actual wavelength (not the nominal wavelength) of the laser,
within 1 nm.
Step 3: Set the power meter to W (watts) mode. The reading should be
at least 400 ꢀW. Set the power meter to dB relative (dB key) mode, and
set the dB reference (Disp-->Ref). The power meter should read 0.0 dB
0.1 dB.
Step 4: Disconnect the fibers from the FC/FC adapter, and connect
them to the OA 5000.
Step 5: Set the OA 5000 attenuation to 0 dB, and the DISABLE button
off (unlit).
Step 6: The power meter reading is the insertion loss of the OA 5000.
Check that the power meter reading is ---2.5 dB or higher (more posi-
tive).
NOTE
During the remaining steps, do not disturb the connections and
fibers.
Step 7: Set the dB reference (Disp-->Ref) at the power meter. The
power meter reading should be 0.00 dB within 0.01 dB.
Step 8: Set the OA 5000 to each of the settings in the table below, and
check that the power meter reads within the listed accuracy limits. At
30 dB, note the reading.
Step 9: Set the OA 5000 to 0 dB. Check that the power meter reads
0.00 dB within the repeatability specification ( 0.05 dB).
Step 10: Set the OA 5000 to 30 dB. Check that the power meter reads
the same as in step 8, within the repeatability specification ( 0.05 dB).
Step 11: If the readings in steps 9 and 10 do not meet the repeatability
specifications, check the connections, and repeat steps 7 to 10.
A --- 2 8
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Appendix G: Product Verification
Table 4-3: Attenuation Accuracy at 1550 nm
OA 5002
OA 5012 / OA 5022 /
OA 5032
Attenuation
setting (dB)
Tolerance Limits (dB)
Tolerance Limits (dB)
10
20
30
40
50
---10.15 to ---9.85
---20.15 to ---19.85
---30.15 to ---29.85
---40.15 to ---39.85
---50.20 to ---49.80
---10.20 to ---9.80
---20.20 to ---19.80
---30.20 to ---29.80
---40.20 to ---39.80
---50.20 to ---49.80
Step 1: Disconnect the fibers from the OA 5000, 1550 nm laser, and
long wavelength sensor. Connect the 850 nm laser to the input fiber and
the short wavelength sensor to the output fiber. Connect the fibers
together using an FC/FC adapter. Set the laser to CW (unmodulated)
mode, and set the laser power level (if adjustable) to maximum, but not
more than 2 mW. Turn on the laser.
850 nm (except
OA 5002):
Insertion Loss,
Attenuation
Accuracy, and
Repeatability
Step 2: At the power meter, select the short wavelength sensor. Set the
wavelength displays of the OA 5000 and the power meter to the actual
wavelength (not the nominal wavelength) of the laser, within 1 nm.
Step 3: Set the power meter to W (watts) mode. The reading should be
at least 400 ꢀW. Set the power meter to dB relative (dB key) mode, and
set the dB reference (Disp-->Ref). The power meter should read 0.0 dB
0.1 dB.
Step 4: Disconnect the fibers from the FC/FC adapter, and connect
them to the OA 5000.
Step 5: Set the OA 5000 attenuation to 0 dB, and the DISABLE button
to off (unlit).
Step 6: The power meter reading is the insertion loss of the OA 5000.
Check that the power meter reading is ---4.0 dB or higher (more posi-
tive).
NOTE
During the remaining steps, do not disturb the connections and
fibers.
OA 5000 Series User Manual
A --- 2 9
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Appendix G: Product Verification
Step 7: Set the dB reference (Disp-->Ref) at the power meter. The
power meter reading should be 0.00 dB within 0.01 dB.
Step 8: Set the OA 5000 to each of the settings in the table below, and
check that the power meter reads within the listed accuracy limits. At
30 db, note the reading.
Step 9: Set the OA 5000 to 0 dB. Check that the power meter reads
0.00 dB within the repeatability specification ( 0.05 dB).
Step 10: Set the OA 5000 to 30 dB. Check that the power meter reads
the same as in step 8, within the repeatability specification ( 0.05 dB).
Step 11: If the readings in steps 9 and 10 do not meet the repeatability
specifications, check the connections, and repeat steps 7 to 10.
Table 4-4: Attenuation Accuracy at 850 nm
OA 5012 / OA 5022 / OA 5032
Attenuation setting (dB) Tolerance Limits (dB)
10
20
30
40
50
60
---10.20 to ---9.80
---20.20 to ---19.80
---30.20 to ---29.80
---40.20 to ---39.80
---50.20 to ---49.80
---60.20 to ---59.80
A --- 3 0
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Appendix H: Replaceable Parts
This chapter contains a list of the components that are replaceable for the
OA 5002, OA 5012, OA 5022, and OA 5032 Optical Attenuators. As de-
scribed below, use this list to identify and order replacement parts.
Replacement parts are available from or through your local Tektronix, Inc.
service center or representative.
Parts Ordering
Information
Changes to Tektronix instruments are sometimes made to accommodate
improved components as they become available and to give you the benefit
of the latest circuit improvements. Therefore, when ordering parts, it is
important to include the following information in your order:
H
H
H
H
Part number
Instrument type or model number
Instrument serial number
Instrument modification number, if applicable
If a part you order has been replaced with a different or improved part, your
local Tektronix service center or representative will contact you concerning
any change in the part number.
Change information, if any, is located at the rear of this manual.
The tabular information in the Replaceable Parts List is arranged for quick
retrieval. Understanding the structure and features of the list will help you
find the all the information you need for ordering replacement parts.
Using the
Replaceable Parts
List
Item Names
In the Replaceable Parts List, an Item Name is separated from the descrip-
tion by a colon (:). Because of space limitations, an Item Name may some-
times appear as incomplete. For further Item Name identification, U.S.
Federal Cataloging Handbook H6-1 can be used where possible.
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Appendix H: Replaceable Parts
Indentation System
This parts list is indented to show the relationship between items. The
following example is of the indentation system used in the Description
column:
1
2
3
4
5
Name & Description
Assembly and/or Component
Attaching parts for Assembly and/or Component
(END ATTACHING PARTS)
Detail Part of Assembly and/or Component
Attaching parts for Detail Part
(END ATTACHING PARTS)
Parts of Detail Part
Attaching parts for Parts of Detail Part
(END ATTACHING PARTS)
Attaching parts always appear at the same indentation as the item it
mounts, while the detail parts are indented to the right. Indented items are
part of, and included with, the next higher indentation. Attaching parts must
be purchased separately, unless otherwise specified.
Abbreviations
Abbreviations conform to American National Standards Institute (ANSI)
standard Y1.1
A --- 3 2
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Appendix H: Replaceable Parts
6
1
5
2
3
4
Figure A-6: OA 5000 Replaceable Parts
OA 5000 Series User Manual
A --- 3 3
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Appendix H: Replaceable Parts
CROSS INDEX --- MFR. CODE NUMBER TO MANUFACTURER
Mfr.
Manufacturer
Address
City,
Code
State, Zip Code
0J260
0JR05
62712
80009
91260
COMTEK MANUFACTURING OF OREGON
TRIQUEST PRECISION PLASTICS
SEIKO INSTRUMENTS USA INC
TEKTRONIX INC
P O BOX 4200
M / S 1 6 --- 2 0 7
BEAVERTON, OR 970764200
3000 LEWIS & CLARK HWY
PO BOX 66008
VANCOUVER, WA 98666---6008
TORRANCE, CA 90505
ELECTRONIC COMPONENTS DIV
2990 W LOMITA BLVD
14150 SW KARL BRAUN DR
PO BOX 500
BEAVERTON, OR 97077---0001
CONNOR FORMED METAL PRODUCTS
1729 JUNCTION AVENUE
SAN JOSE, CA 95112
TK2565 VISION PLASTICS INC
26000 SW PARKWAY CENTER DRIVE
WILSONVILLE, OR 97070
A --- 3 4
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Appendix H: Replaceable Parts
Fig. &
Index
No.
Tektronix
Part No.
Serial No.
Effective Dscont
Mfr.
12345 Name & Description
Qty
Code
Mfr. Part No.
A 6 --- 1 337---3039---00
2
1
1
SHIELD,ELEC:
0J260
91260
0JR05
ORDER BY DESC
ORDER BY DESC
ORDER BY DESC
---2
--- 3
214---3143---00
105---0865---00
SPRING,HLEXT:0.125 ID X 0.545 L, XLOOP
BAR,LATCH RLSE:AA501
--- 4
--- 5
--- 6
366---1851---01
105---0866---00
366---2166---00
1
1
2
KNOB,LATCH:IVORY GY,0.625 X 0.25 X 1.09
LATCH,RETAINING:
80009
0JR05
366---1851---01
ORDER BY DESC
KNOB:ABS,IVORY GRAY,0.165 ID X 0.40 OD
STANDARD ACCESSORIES
TK2565 366---2166---00
020---1885---00
070---7612---05
620– 0057– 00
016– 0195– 05
1
1
1
2
ACCESSORY PKG:O/E CONVERTER
MANUAL,TECH:INSTR,OA5000 Series
POWER SPLY ASSY:MAINFRAME
BLANK PLUG-IN PANELS,FRONT
80009
80009
80009
80009
020 – 1885 – 00
070 – 7612 – 05
620 – 0057 – 00
016 – 0195 – 05
OPTIONAL ACCESSORIES
174---1497---00
174---1385---00
174---1386---00
174---1387---00
174---1388---00
174---2322---00
174---2323---00
174---2324---00
1
1
1
1
1
1
1
1
CA ASSY,FBR OPT:SINGLE MODE,2M L
CA ASSY,FBR OPT:SGL MODE,2M L
CA ASSY,FBR OPT:SINGLE MODE,2M L
CA ASSY,FBR OPT:SGL MODE,2M L
CA ASSY,FBR OPT:SGL MODE,2M L,
CABLE,FIBER OPT:JUMPER,2 METER,62.5
CABLE,FIBER OPT:JUMPER,2 METER,62.5
CABLE,FIBER OPT:JUMPER,2 METER,62.5
80009
80009
80009
80009
80009
62712
62712
62712
174 –1497 – 00
174 –1385 – 00
174 –1386 – 00
174 –1387 – 00
174 –1388 – 00
174 –2322 – 00
174 –2323 – 00
P C / S K --- 2 0 – 002A
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Appendix H: Replaceable Parts
A --- 3 6
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Index
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Index
MIN ATT, 2 --- 7
*ESR?, 3 --- 22, 3 --- 35
A
MODE, 2 --- 11
EVEnt?, 3 --- 22– 3 --- 23
EVMSG?, 3 --- 23
EVQty?, 3 --- 23
RECALL1, RECALL2, 2 --- 15
SET REF, 2 --- 11
Abbreviating, Command, 3 --- 8
STORE1, STORE2, 2 --- 15
WAVELENGTH, 2 --- 5
FACTORY, 3 --- 24– 3 --- 25
HEADER, 3 --- 25– 3 --- 26
Header, 3 --- 6
absolute display mode, 2 --- 6
See also REFerence command
Accessories, A --- 1
Optional, A --- 1
*IDN?, 3 --- 26
List
Standard, A --- 1
Common command, 3 --- 13
Device command, 3 --- 14
C
ADDR (SET) button, 2 --- 9, 3 --- 3
ALLev? Command, 3 --- 15
*LRN?, 3 --- 26– 3 --- 27
Message, 3 --- 6
*CAL? Command, 3 --- 18
Mnemonic, 3 --- 6
ALLev? command, 3 --- 22– 3 --- 23
CAUTION
Numeric argument, 3 --- 10
*OPC, 3 --- 27
Amplitude. See Pulse generator,
Amplitude
statement in manuals, ix
statement on equipment, ix
*PSC, 3 --- 27– 3 --- 28, 3 --- 38
Query, 3 --- 6
Argument, Command, 3 --- 6
Cautions
RECall, 3 --- 28
fuses, x
ASCII, 3 --- 5
Character table, A --- 8
REFerence, 3 --- 29
*RST, 3 --- 29– 3 --- 30
Rules for forming, 3 --- 5
Separator, 3 --- 6
grounding the OA5000, x
operating in explosive atmo-
spheres, xi
ATT indicator, 2 --- 6
Attenuation
power cord, x
power source, x
disabling, 2 --- 3
enabling, 2 --- 3
setting, 2 --- 5
Set, 3 --- 6
removing panels or covers, x
*SRE, 3 --- 30– 3 --- 31, 3 --- 38
*STB?, 3 --- 31, 3 --- 36
STOre, 3 --- 31– 3 --- 32
Channel delay. See Pulse generator,
Channel delay
ATTenuation Command, 3 --- 16– 3 --- 34
ATTen:DB, 3 --- 16– 3 --- 17
Syntax, 3 --- 5
BNF (Backus Naur form), 3 --- 5
Table
Common command, 3 --- 13
Device command, 3 --- 14
*TST?, 3 --- 32– 3 --- 33
Clear Status, 3 --- 18
ATTen:DBR, 3 --- 16– 3 --- 17
ATTen:MINimum, 3 --- 16– 3 --- 17
*CLS command, 3 --- 18– 3 --- 19
Command, 3 --- 13
*CAL?, 3 --- 18
attenuation levels
recalling, 2 --- 15
storing, 2 --- 15
*SET?, 3 --- 26– 3 --- 27
Abbreviating, 3 --- 8
ADJusting?, 3 --- 15
ALLev?, 3 --- 15
VERBOSE, 3 --- 33
*WAI, 3 --- 34
WAVelength, 3 --- 34
Command syntax, 3 --- 5
Argument, 3 --- 6
BNF (Backus Naur form), 3 --- 5
ATTenuation, 3 --- 16– 3 --- 17
Block argument, 3 --- 10
BLRN, 3 --- 17
B
Common command, List, 3 --- 13
Concatenating, Command, 3 --- 8
Configuration, Command query, 3 --- 26
Block, Command argument, 3 --- 10
BLRN Command, 3 --- 17– 3 --- 18
BNF (Backus Naur form), 3 --- 5
Break, 3 --- 5
*CLS, 3 --- 18
Common, List, 3 --- 13
Concatenating, 3 --- 8
DESE, 3 --- 19, 3 --- 37
Device, List, 3 --- 14
DISable, 3 --- 20
Conflicts, 3 --- 40
See also Blinking
Connector, GPIB, 3 --- 1
Buttons
ADDR (SET), 2 --- 9, 3 --- 3
DISABLE, 2 --- 3
Controller, GPIB, 3 --- 1
DISPlay, 3 --- 20– 3 --- 21
*ESE, 3 --- 21– 3 --- 22, 3 --- 38
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D
F
I
DANGER, statement on equipment, ix
DCL, A --- 7
FACTORY command, 3 --- 24
*IDN? query, 3 --- 26
Fall time. See Pulse generator, Fall
time
IEEE Std. 488.2
3 --- 13
1987, 3 --- 1, 3 --- 5,
DESE command, 3 --- 19, 3 --- 37
Flashing. See Blinking
Initialize. See Reset
DESER register, 3 --- 19, 3 --- 27–3 --- 28,
3 --- 37
insertion loss, measuring, 2 --- 12
Device Clear, 3 --- 5, A --- 7
Interface message, A --- 7
Device command, List, 3 --- 14
G
Device event status enable register.
See DESER register
GET, A --- 7
Go to local, A --- 7
GPIB
L
Diagram, Syntax, 3 --- 11
DISABLE button, 2 --- 3
DISable Command, 3 --- 20
Lead delay. See Pulse generator, Lead
delay
Additional information you need
about your controller, 3 --- 1
DISPlay Command, 3 --- 20–3 --- 34
DISP:DB, 3 --- 20–3 --- 21
Learning about the OA 5000, 1 --- 3
Level. See Trigger, Level
Configurations, 3 --- 2
Connection rules, 3 --- 2
EOI (end or identify), 3 --- 9
Function subsets, A --- 9
Menu, 3 --- 3
DISP:DBR, 3 --- 20–3 --- 21
Limits. See Pulse generator, Limits
DISP:SETRef, 3 --- 20–3 --- 21
DISP:SETWavelength, 3 --- 20–3 --- 21
List
Common command, 3 --- 13
Device command, 3 --- 14
Documentation, A --- 1
Parameter Setting, 3 --- 3
setting address, 2 --- 9, 3 --- 3
Using a controller, 3 --- 1
Duty cycle. See Pulse generator, Duty
cycle
LLO, A --- 7
Local lock out, 3 --- 1, A --- 7
Low. See Pulse generator, Low
*LRN? query, 3 --- 26–3 --- 27
GPIB address, setting, 2 --- 9
GPIB connector, 3 --- 1
Group execute trigger, A --- 7
GTL, A --- 7
E
EOI (end or identify), 3 --- 9
Error message, Programming inter-
face, 3 --- 41
M
H
*ESE command, 3 --- 21–3 --- 22, 3 --- 38
Macro. See Alias
ESER register, 3 --- 21–3 --- 22,
3 --- 27–3 --- 28, 3 --- 38
Manuals, A --- 1
Header
Command, 3 --- 6, 3 --- 25–3 --- 26
measuring insertion loss, 2---12
Menu, GPIB, 3 --- 3
*ESR? command, 3 --- 22
*ESR? query, 3 --- 35
Included in query response,
3 --- 25–3 --- 26, 3 --- 33
Message
HEADER command, 3 --- 25
Event handling, 3 --- 35, 3 --- 40
Event Quantity query, 3 --- 23
Event query, 3 --- 22–3 --- 23
Event queue, 3 --- 22–3 --- 23, 3 --- 39
Command, 3 --- 6
Command terminator, 3 --- 9
Handling, 3 --- 35
High. See Pulse generator, High
Table of program messages, 3 --- 41
MIN ATT button, 2 --- 7
Event status enable register. See ESER
register
Mnemonic, Command, 3 --- 6
Mode. See Trigger, Mode
EVEnt? command, 3 --- 22–3 --- 23
EVMSG? command, 3 --- 23
EVQty? command, 3 --- 23
I --- 2
Index
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N
Q
S
Numeric, Command argument, 3 --- 10
Query, Header in query response,
3 --- 25–3 --- 26, 3 --- 33
Safety, ix
Symbols, ix
Query command, 3 --- 6
Saved settings. See Settings
SBR register, 3 --- 31, 3 --- 36
SDC, A --- 7
Queue
Event, 3 --- 39
Output, 3 --- 39
O
Selected device clear, A --- 7
Self test, 3 --- 32–3 --- 33
Separator, Command, 3 --- 6
Offset. See Pulse generator, Offset
*OPC command, 3 --- 27
Quick tour, 1 --- 3
Operation complete command, 3 --- 27
Operation complete wait, 3 --- 34
Serial poll, 3 --- 1, 3 --- 36
Disable, A --- 7
Enable, A --- 7
R
Optical Cables, optional accessories,
A --- 1
RECall command, 3 --- 28
Recall settings. See Settings
--- R E F indicator, 2 --- 6, 2 --- 11
REFerence command, 3 --- 29
reference level, setting, 2 --- 11
reference mode, 2 --- 12
Service request enable command,
3 --- 30–3 --- 31
Optical Output, x, 2 --- 3
optical output power, approximating,
2 --- 13
Service request enable register,
3 --- 30–3 --- 31
See also SRER register
Output queue, 3 --- 39
SESR register, 3 --- 18, 3 --- 22, 3 --- 27,
3 --- 35
Set
Register
Command query, 3 --- 26–3 --- 27
Query, 3 --- 26–3 --- 27
P
DESER, 3 --- 19, 3 --- 27–3 --- 28, 3 --- 37
ESER, 3 --- 21–3 --- 22, 3 --- 27–3 --- 28,
3 --- 38
SBR, 3 --- 31, 3 --- 36
Set command, 3 --- 6
SET REF button, 2 --- 11
*SET? query, 3 --- 26–3 --- 27
Shipment, A --- 11, A --- 13
Slope. See Trigger, Slope
SPD, A --- 7
Packing for shipment, A --- 11, A --- 13
Parallel poll, A --- 7
SESR, 3 --- 18, 3 --- 22, 3 --- 27, 3 --- 35
Phase. See Pulse generator, Phase
Polarity. See Pulse generator, Polarity
SRER, 3 --- 27–3 --- 28, 3 --- 30–3 --- 31,
3 --- 38
relative display mode, 2 --- 6
Power on status clear command,
3 --- 27–3 --- 28
Remote. See Programming
Reset
PPC, A --- 7
SPE, A --- 7
See also FACTORY
Command, 3 --- 29–3 --- 30
PPD, A --- 7
Specifications, A --- 3
*SRE command, 3 --- 30–3 --- 31, 3 --- 38
PPE, A --- 7
Rise time. See Pulse generator, Rise
time
PPU, A --- 7
SRER register, 3 --- 27–3 --- 28,
3 --- 30–3 --- 31, 3 --- 38
Pretrigger. See Trigger, Pretrigger
Programming, 3 --- 1
*RST command, 3 --- 29–3 --- 30
Standard event status register. See
SESR register
Rules, Command forming, 3 --- 5
Programming command. See Com-
mand
Status, 3 --- 35
Status byte register. See SBR register
*STB? query, 3 --- 31, 3 --- 36
*PSC command, 3 --- 27–3 --- 28, 3 --- 38
Pulse rate. See Pulse generator, Pulse
rate
STORe command, 3 --- 31–3 --- 32
See also RECall command
Pulse width. See Pulse generator,
Pulse width
OA 5000 Series User Manual
I --- 3
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STORE1, STORE2 buttons, 2 --- 15
Trail delay. See Pulse generator, Trail
delay
V
Syntax
Transducer input. See Pulse generator,
Transducer input
BNF (Backus Naur form), 3 --- 5
Command, 3 --- 5
Diagram, 3 --- 11
VERBOSE command, 3 --- 33
Transition. See Pulse generator,
Transition
*TST? query, 3 --- 32–3 --- 33
W
Tutorial, 1 --- 3
T
*WAI command, 3 --- 34
Wait for operation complete, 3 --- 34
WARNING, statement in manual, ix
Warning, optical output, x, 2 --- 3
WAVELENGTH, button, 2 --- 5
WAVelength command, 3 --- 34
Width. See Pulse generator, Width
Table
ASCII character, A --- 8
Common command, 3 --- 13
Device command, 3 --- 14
Programming message, 3 --- 41
U
UNL, A --- 7
Unlisten, A --- 7
UNT, A --- 7
Tek Std. Codes and Formats 1989,
3 --- 13
Terminator, Command message, 3 --- 9
Untalk, A --- 7
Tour, 1 --- 3
I --- 4
Index
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