Tektronix Personal Lift CT 1 User Manual

Instructions  
CT-1/CT-2  
Current Transformer  
070-7957-01  
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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. Tektronix will provide  
such service at Customer’s site without charge during the warranty period, if the service is performed within the  
normal on-site service area. Tektronix will provide on-site service outside the normal on-site service area only  
upon prior agreement and subject to payment of all travel expenses by Customer. When or where on-site service is  
not available, 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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General Safety Summary  
Review the following safety precautions to avoid injury and prevent damage to  
this product or any products connected to it. To avoid potential hazards, use this  
product only as specified.  
To Avoid Fire or  
Personal Injury  
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings  
and markings on the product. Consult the product manual for further ratings  
information before making connections to the product.  
Do Not Operate With Suspected Failures. If you suspect there is damage to this  
product, have it inspected by qualified service personnel.  
Ground the Product. To avoid electric shock, the mounting stud must be  
connected to earth ground.  
Do Not Operate in Wet/Damp Conditions.  
Do Not Operate in an Explosive Atmosphere.  
Keep Product Surfaces Clean and Dry.  
Symbols and Terms  
Terms in this Manual. These terms may appear in this manual:  
WARNING. Warning statements identify conditions or practices that could result  
in injury or loss of life.  
CAUTION. Caution statements identify conditions or practices that could result in  
damage to this product or other property.  
Symbols on the Product. The following symbols may appear on the product:  
WARNING  
High Voltage  
Protective Ground  
(Earth) Terminal  
CAUTION  
Refer to Manual  
Double  
Insulated  
i
CT-1/CT-2 Current Transformer  
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General Safety Summary  
ii  
CT-1/CT-2 Current Transformer  
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Introduction  
The CT-1 and CT-2 are high-frequency, bidirectional current probes. The CT-1 is  
a 1 GHz current probe and the CT-2 is a 200 MHz current probe. Each current  
probe comes with a P6041 probe cable to allow you to connect directly to an  
oscilloscope to make measurements.  
Earth ground  
mounting stud  
P6041 Probe  
connection  
Figure 1: CT-1 current probe  
The CT-1 and CT-2 are available as separately purchased units (Option 09). See  
the Replaceable Parts List at the end of this manual for ordering information.  
This manual provides information on four subjects:  
H
H
H
H
Description  
Operation  
Specifications  
Replaceable Parts List  
1
CT-1/CT-2 Current Transformer  
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Description  
The CT-1 (1 GHz) and CT-2 (200 MHz) are current probes designed for either  
permanent or temporary installation in the device-under-test (DUT). These  
probes are particularly useful for measuring high-frequency currents in solid state  
circuitry with minimum circuit loading. Due to bidirectional compatibility, the  
CT-1 and CT-2 can be used to inject a signal or as an interstage transformer.  
The probes inductively measure current through a conductor and develop a  
voltage proportional to the current. For each mA of input current, they output  
5 mv (1 mv for CT-2) of signal when properly terminated. Since the CT-1 and  
the CT-2 are dynamic current probes (non-DC), the presence of DC current  
affects their performance. Figures 2 and 3 show the influence of DC current on  
frequency response.  
0 A  
0.5 A 1 A  
DC  
DC  
DC  
100%  
90%  
80%  
70%  
10 k  
100 k  
1 M  
10 M  
100 M  
1 G  
Frequency (Hz)  
This response was obtained with the + side of the CT-1 facing  
the signal source (preferred connection above 800 MHz)  
Figure 2: CT-1 frequency response vs. DC current  
2
CT-1/CT-2 Current Transformer  
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Description  
0 A  
0.5 A  
1 A  
DC  
DC  
DC  
100%  
90%  
80%  
70%  
60%  
1 k  
10 k  
100 k  
1 M  
10 M  
100 M  
Frequency (Hz)  
This response was obtained with the + side of the CT-2 facing the  
signal source (preferred connection)  
Figure 3: CT-2 frequency response vs. DC current  
The CT-1 and CT-2 consist of a current transformer and a flexible probe  
cable that attaches between the transformer and the oscilloscope. In  
addition, the CT-1 and CT-2 have an internal termination resistor that  
reduces reflections that allows the transformer to be disconnected from the  
probe cable and left in the circuit. Figure 4 shows a simplified circuit of the  
CT-1 and CT-2.  
50 W  
Input circuit  
Figure 4: CT-1 and CT-2 simplified circuit  
3
CT-1/CT-2 Current Transformer  
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Specifications  
Table 1 lists the electrical characteristics of the CT-1 and CT-2 Transformers  
when they are connected to the P6041 Probe cable. The environmental and  
physical characteristics follow Tables 1 and 2.  
Table 1: Electrical characteristics  
Specification  
CT-1 with P6041 Probe  
CT-2 with P6041 Probe  
Sensitivity  
(see Figures 2 and 3)  
5 mV/mA, ±3% into a 50 W load  
1 mV/mA, ±3% into a 50 W load  
Pulse Response  
Rise time: < 0.35 ns, 10% to 90%  
Rise time: < 0.5 ns, 10% to 90%  
Aberrations: < 5% as seen by a 1 GHz system Aberrations: + 4%, –8% as seen by a  
200 MHz system  
L/R time constant  
Approximately 5 ms  
Approximately 125 ms  
Insertion Impedance  
50 W termination: 1 W shunted by approxi-  
mately 5 mH  
50 W termination: 0.04 W shunted by  
approximately 5 mH  
Unterminated: 2 W shunted by approximately  
5 mH  
Unterminated: 0.08 W shunted by approxi-  
mately 5 mH  
Frequency Response  
Turns Ratio  
25 kHz to 1 GHz  
1.2 kHz to 200 MHz  
1:25  
1:5  
Capacitive Loading  
#14 bare wire: typically 1.5 pF  
#16 bare wire: typically 1.8 pF  
#20 bare wire: typically 0.6 pF  
#22 bare wire: typically 0.7 pF  
Maximum Bare Wire Voltage  
(uninsulated)  
175 V  
CAT I  
175 V  
CAT I  
RMS  
RMS  
1000 V (DC + peak AC) <3.25% duty factor  
Approximately 2.8 ns measured from 50%  
points on leading edge of the current step and points on leading edge of the current step and  
1000 V (DC + peak AC) <3.25% duty factor  
Approximately 5.8 ns measured from 50%  
Signal Delay (with P6041 Probe  
Cable)  
output voltage  
output voltage  
CT-1 Transformer only: 0.4 ns  
CT-2 Transformer only: 0.3 ns  
Effect of Direct Current  
(see Figures 6 and 7)  
Approximately 0.3 A increases decay by a  
factor of 2  
Approximately 0.3 A increases decay by a  
factor of 2  
DC  
DC  
Amp Second Rating  
1 amp msec  
50 amp msec  
When this product is exceeded, the core  
saturates and the CT-1 output drops to zero  
When this product is exceeded, the core  
saturates and the CT-2 output drops to zero  
Pulse Current Rating  
RMS Current Rating  
Output Connector  
12 amps  
36 amps  
0.5 amperes maximum  
Amphenol Sub-Minax #27-3  
2.5 amperes maximum  
Amphenol Sub-Minax #27-3  
4
CT-1/CT-2 Current Transformer  
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Specifications  
Table 2: General specifications (CT-1 and CT-2)  
Environmental  
Meets all Class IV instrument specifications  
Operating Temperature  
Nonoperating Temperature  
Mechanical  
0_ C to +55_ C  
–62_ C to +82_ C  
Hole size:  
Dimensions  
CT-1 1.78 mm (0.070 in.)  
CT-2 1.32 mm (0.052 in.)  
6-32  
mounting  
stud  
15 mm  
(0.59 in.)  
Connector  
38.6 mm  
(1.52 in.)  
10.3 mm  
(0.406 in.)  
P6041 Probe cable length  
Weight  
106.68 mm (42 in.)  
15 gm (0.525 oz.) without P6041  
47 gm (1.655 oz.) with P6041  
Certifications and compliances  
EC Declaration of Conformity – Low Compliance was demonstrated to the following specification as listed in the Official Journal of  
Voltage  
the European Communities:  
Low Voltage Directive 73/23/EEC, as amended by 93/68/EEC  
EN 61010-1:1993  
Safety requirements for electrical equipment for measurement, control, and laboratory use  
Installation Category Descriptions  
Terminals on this product may have different installation category designations. The installation  
categories are:  
CAT III Distribution-level mains (usually permanently connected). Equipment at this level is  
typically in a fixed industrial location  
CAT II Local-level mains (wall sockets). Equipment at this level includes appliances, portable  
tools, and similar products. Equipment is usually cord-connected  
CAT I  
Secondary (signal level) or battery operated circuits of electronic equipment  
5
CT-1/CT-2 Current Transformer  
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Operation  
This section describes how to install the CT-1 or CT-2, discusses low-frequency  
probing, and provides information on safety and product care.  
Installing the CT-1 or CT-2  
The CT-1 or CT-2 transformers can be attached to the chassis or circuit board to  
measure current in transistors, diodes, or other components. Any number of  
transformers can be used.  
When observing the output of a CT-1 or CT-2 transformer, ensure it is terminated  
into 50 W. If the oscilloscope input is not 50 W, use a suitable matching  
terminator (see recommended accessories in the Replaceable Parts List).  
Figure 5 shows the output of the CT-1 compared with the input pulse from a  
250 ps fast-rise pulse generator and the output of the CT-2 as seen by a 100 MHz  
oscilloscope system.  
If the CT-1 or CT-2 is connected so that the positive (+) label side faces the  
signal source, the input current and output voltage will be in phase. This is the  
preferred connection. For pulses with a risetime slower than 1 ns, the CT-1 or  
CT-2 may be connected in either polarity.  
Ground and the voltage ratings do not apply when installed on a fully insulated  
conductor. The 175 V rating is based on long term applications that may degrade  
the insulation. The voltage on bare signal wire must be limited to the 175 VRMS  
and the 1000 V DC + peak AC ratings.  
Input current  
100 mV/div  
Output voltage  
Output voltage  
20 ns/div  
2 ns/div  
100 mV/div  
CT-1 output waveform  
CT-2 output waveform  
Figure 5: CT-1 and CT-2 output waveform  
6
CT-1/CT-2 Current Transformer  
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Operation  
Low Frequency Response  
The low-frequency response of the current transformer is proportional to the  
inductance of the transformer windings. A DC component in the current being  
measured tends to reduce this inductance. Figures 2 and 3 show this effect in the  
frequency domain.  
This effect is also seen in the time domain. Figure 6 shows that the pulse tilt is  
increased in the presence of significant DC current. The DC current required to  
increase the tilt by a factor of two is about 0.3 A. Pulse currents that start at zero  
and remain unidirectional have a DC component that the user should consider.  
When droop is present at low frequencies, the apparent overall peak-to-peak  
height from top to bottom is not the true current. The height of a flat-top pulse  
still can be measured accurately by observing the transition edge of the pulse. In  
Figure 7, the 50 mA pulse is faithfully reproduced at the high-to-low transition at  
the center of the screen.  
Pulse width, tilt, and the lower 3 dB frequency are related by the formula:  
Percent tilt = 200π Tp f1  
Where:  
Tp = pulse width  
f1 = lower 3 dB frequency  
10 mA/div  
20 ms/div  
Output  
voltage  
Input  
current  
0 A  
DC  
0.3 A  
DC  
1 A  
DC  
Figure 6: CT-1 decay characteristics referenced to front corner  
7
CT-1/CT-2 Current Transformer  
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Operation  
10 mA/div  
5 ms/div  
0 A  
DC  
DC  
0.4 A  
Input  
current  
Output  
voltage  
0.4 A  
DC  
0 A  
DC  
Figure 7: CT-2 decay characteristics referenced to transition  
Additional consideration needs to be given to the amp second rating of the  
transformer. The product of the pulse current and the pulse duration should be  
less than the amp second rating to keep the transformer core from saturating.  
When saturation occurs, the output voltage falls to zero.  
Probe Handling  
Only normal handling considerations are necessary with the CT-1 and CT-2  
transformers. They are sealed units and are not designed to be disassembled. If  
the transformer or cable is damaged, return it to Tektronix for replacement.  
CAUTION. Dropping the CT-1 or CT-2 transformer may break the probe. Do not  
pull or stretch the P6041 cable or place objects on the cable. This may damage  
the probe cable.  
8
CT-1/CT-2 Current Transformer  
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Replaceable Parts List  
This section contains a list of the replaceable parts for the CT-1 and CT-2. Use  
this list to identify and order replacement parts.  
Parts Ordering Information  
Replacement parts are available through your local Tektronix field office or  
representative.  
Changes to Tektronix products are sometimes made to accommodate improved  
components as they become available and to give you the benefit of the latest  
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 you order a part that has been replaced with a different or improved part, your  
local Tektronix field office or representative will contact you concerning any  
change in part number.  
Change information, if any, is located at the rear of this manual.  
Using the Replaceable Parts List  
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  
all of the information you need for ordering replacement parts. The following  
table describes the content of each column in the parts list.  
9
CT-1/CT-2 Current Transformer  
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Replaceable Parts List  
Parts list column descriptions  
Column Column name  
Description  
1
Figure & index number  
Items in this section are referenced by figure and index numbers to the exploded view  
illustrations that follow.  
2
Tektronix part number  
Serial number  
Use this part number when ordering replacement parts from Tektronix.  
3 and 4  
Column three indicates the serial number at which the part was first effective. Column four  
indicates the serial number at which the part was discontinued. No entries indicates the part is  
good for all serial numbers.  
5
6
Qty  
This indicates the quantity of parts used.  
Name & description  
An item name is separated from the description by a colon (:). Because of space limitations, an  
item name may sometimes appear as incomplete. Use the U.S. Federal Catalog handbook  
H6-1 for further item name identification.  
7
8
Mfr. code  
This indicates the code of the actual manufacturer of the part.  
This indicates the actual manufacturer’s or vendor’s part number.  
Mfr. part number  
Abbreviations  
Abbreviations conform to American National Standard ANSI Y1.1–1972.  
Mfr. Code to Manufacturer  
Cross Index  
The table titled Manufacturers Cross Index shows codes, names, and addresses  
of manufacturers or vendors of components listed in the parts list.  
10  
CT-1/CT-2 Current Transformer  
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Replaceable Parts List  
4
2
3
1
Recommended  
accessories  
Figure 8: CT-1 and CT-2 accessories  
Replaceable parts list  
Fig. &  
Tektronix  
Serial no. Serial no.  
index  
part number effective  
discont’d  
Qty Name & description  
Mfr. code  
Mfr. part number  
number  
8-1  
CURRENT TRANSFORMER:CT-1 OR CT-2 WITH  
P6041  
CT-1 OR CT-2  
(OPION 09 W/O P6041)  
8-2  
8-3  
1
1
P6041  
80009  
24931  
P6041  
103–0028–00  
ADAPTER,CONN:BNC,FEMALE TO  
FEMALE,1.3 L,GOLD/NICKEL  
28A100–2  
8-4  
011–0049–01  
070–7957–XX  
1
1
TERMN,COAXIAL:50 OHM,2W,BNC  
MANUAL,TECH:CT1/CT2 PROBE,DP  
80009  
011–0049–01  
TK2548  
PER TEK  
DOCUMENTATION  
Manufacturers cross index  
Mfr.  
code  
Manufacturer  
Address  
City, state, zip code  
24931  
BERG ELECTRONICS INC  
BERG ELECTRONICS RF/COAXIAL DIV  
2100 EARLYWOOD DR  
PO BOX 547  
FRANKLIN, IN 46131  
80009  
TEKTRONIX INC  
14150 SW KARL BRAUN DR  
PO BOX 500  
BEAVERTON, OR 97077–0001  
BEAVERTON, OR 97005  
TK2548  
XEROX CORPORATION  
14181 SW MILLIKAN WAY  
11  
CT-1/CT-2 Current Transformer  
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Replaceable Parts List  
12  
CT-1/CT-2 Current Transformer  
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