National Instruments Graphics Tablet NI 4070 4072 6 1 2 Digit FlexDMM User Manual

CALIBRATION PROCEDURE  
NI 4070/4072 6½-Digit FlexDMM  
This document contains step-by-step instructions for writing an external  
calibration procedure for the National Instruments PXI/PCI-4070 and  
NI PXI-4072 digital multimeters (DMMs). Each of these  
isolated digitizer. For more information on calibration, visit ni.com/  
DC Current....................................................................................... 62  
AC Current....................................................................................... 62  
Frequency......................................................................................... 63  
Capacitance and Inductance............................................................. 63  
Appendix A: Calibration Options ........................................................... 64  
Where to Go for Support......................................................................... 68  
Download from Www.Somanuals.com. All Manuals Search And Download.  
The procedures in this document are described using C function calls.  
You also can program in LabVIEW using the VIs that correspond to the  
C function calls.  
Documentation Requirements  
In addition to this calibration document, you may find the following  
references helpful in writing your calibration utility. All of these  
documents are installed on your computer when you install NI-DMM.  
To locate them, select Start»All Programs»National Instruments»  
NI-DMM»Documentation.  
NI Digital Multimeters Help  
NI Digital Multimeters Getting Started Guide  
NI recommends referring to the following document online at ni.com/  
manualsto ensure that you are using the latest NI 4070/4072  
specifications:  
NI 4070/4072 Specifications  
You may need the following documents, which are available at ni.com/  
manuals, to perform the optional frequency verification procedure:  
TB-2715 Terminal Block Installation Guide  
About Your NI 6608 Device  
Calibration Function Reference  
For detailed information about the NI-DMM calibration functions used in  
this procedure, refer to the LabVIEW Reference or the C/CVI/VB Reference  
sections of the NI Digital Multimeters Help, located at Start»  
All Programs»National Instruments»NI-DMM»Documentation.  
Password  
The default calibration password in NI-DMM is "NI".  
© National Instruments Corporation  
3
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
     
Calibration Interval  
The accuracy requirements of your measurement application determine  
how often you should calibrate the NI 4070/4072. NI recommends  
performing a complete calibration at least once every two years. NI does  
not guarantee the absolute accuracy of the NI 4070/4072 beyond this  
two-year calibration interval. You can shorten the calibration interval based  
on the demands of your application. Refer to Appendix A: Calibration  
Options for more information.  
Test Equipment  
This section describes the required and optional equipment for calibration.  
Required Test Equipment  
Requirements for All NI 4070/4072 Devices  
The following equipment is required for calibrating the NI 4070/4072:  
Fluke 5700A multifunction calibrator calibrated within the last  
90 days, or a Fluke 5720A multifunction calibrator calibrated within  
the last year  
Two sets of Fluke 5440 low thermal electromotive force (EMF) copper  
cables  
Pomona 5145 insulated double banana plug shorting bar (or another  
means of creating a short with low thermal EMF (150 nV) across the  
HI and LO input banana plug connectors on the NI 4070/4072)  
Two Pomona B-4 banana-to-banana patch cords (cables) or similar  
banana-to-banana cables with length not to exceed 4 in.  
National Instruments PXI chassis and controller, or a personal  
computer (PC) with an available slot for the NI 4070/4072  
Additional Requirements for the NI 4072  
The following equipment is required for calibrating the capacitance and  
inductance modes of the NI 4072:  
25 Ω, 125 Ω, 5 kΩ, and 100 kΩ resistors with thermal drift 5 ppm/°C  
and tolerance 1%. The distance between the resistor leads and the  
NI 4072 terminals should be 1 in.  
Verification capacitors calibrated to at least four times the accuracy of  
the NI 4072, with temperature coefficients 250 ppm/°C. The values  
of the verification capacitors should cover the complete capacitance  
range. NI suggests using traceable capacitor standards with values  
10% of full range for all ranges, except the 300 pF range. For the  
NI 4070/4072 Calibration Procedure  
4
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
       
300 pF range, a capacitor with values between 90–100% of full scale  
should be used. NI suggests using the capacitance standards of the  
SCA Series from IET Labs. This calibration procedure assumes the use  
of 270 pF, 1 nF, 100 nF, 10 μF, and 1000 μF standards.  
If you are using cables to connect the verification capacitors to the  
NI 4072 banana plug connectors, NI recommends using Pasternack  
PE3005 banana-to-banana coaxial cables with length 4 inches and  
total capacitance 40 pF. Before performing the verification  
procedure, you should know the total capacitance up to the end of the  
banana connectors that plug into the NI 4072.  
Optional Test Equipment  
The following equipment is optional for calibrating the NI 4070/4072 and  
is only used for frequency verification:  
NI PXI-6608 timing and digital I/O module  
National Instruments SH68-68-D1 shielded cable  
National Instruments TB-2715 terminal block  
Pomona MDP 4892 double banana plug with strain relief  
Coaxial cable (for example, RG178)  
Test Conditions  
Follow these guidelines to optimize the connections and the environment  
during calibration:  
Ensure that the PXI chassis fan speed is set to HI (if calibrating the  
NI PXI-4070/4072) and that the fan filters are clean.  
Use PXI filler panels in all vacant slots to allow proper cooling.  
Plug the PXI chassis or PC and the calibrator into the same power strip  
to avoid ground loops.  
Power on and warm up both the calibrator and the NI 4070/4072 for at  
least 60 minutes before beginning this calibration procedure.  
Maintain an ambient temperature of 23 1 °C.  
Maintain an ambient relative humidity of less than 60%.  
Allow the calibrator to settle fully before taking any measurements.  
Consult the Fluke 5700A/5720A user documentation for instructions.  
Allow the thermal EMF enough time to stabilize when you change  
connections to the calibrator or the NI 4070/4072. The suggested time  
periods are stated where necessary throughout this document.  
Keep a shorting bar connected between the V GUARD and  
GROUND binding posts of the calibrator at all times.  
© National Instruments Corporation  
5
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
Clean any oxidation from the banana plugs on the Fluke 5440 cables  
before plugging them into the binding posts of the calibrator or the  
banana plug connectors of the NI 4070/4072. Oxidation tarnishes the  
copper banana plugs so that they appear dull rather than shiny and  
leads to greater thermal EMF.  
Keep the blue banana plugs on the Fluke 5440 cables connected to the  
V GUARD binding post of the calibrator at all times.  
Prevent the cables from moving or vibrating by taping or strapping  
them to a nonvibrating surface. Movement or vibration causes  
triboelectric effects that can result in measurement errors.  
Calibration Procedures  
The calibration process includes the following steps:  
2. Verification ProceduresVerify the existing operation of the device.  
This step confirms whether the device is operating within its specified  
range prior to calibration. Figure 4 shows the procedural flow for  
verification.  
3. Adjustment Procedures—Submit the device to NI for a factory  
calibration to adjust the calibration constants. Figure 5 shows the  
procedural flow for adjustment.  
4. Reverification—Repeat the verification procedure to ensure that the  
device is operating within its specifications after adjustment.  
These steps are described in more detail in the following sections.  
Note In some cases, the complete calibration procedure may not be required. Refer to  
Appendix A: Calibration Options for more information.  
Initial Setup  
Note This section is necessary for pre-adjustment verifications only. If you are performing  
a post-adjustment verification, skip the setup and go directly to the Verifying DC Voltage  
section.  
To set up the test equipment, complete the following steps:  
1. Remove all connections from the four input banana plug connectors on  
the NI 4070/4072.  
2. Verify that the calibrator has been calibrated within the time limits  
specified in the Required Test Equipment section, and that DC zeros  
calibration has been performed within the last 30 days. Consult the  
NI 4070/4072 Calibration Procedure  
6
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
Fluke 5700A/5720A user documentation for instructions on  
calibrating these devices.  
Note Ensure that both the calibrator and the NI 4070/4072 (installed in a powered-on  
PXI chassis or PC) are warmed up for at least 60 minutes before you begin this procedure.  
3. Call niDMM_initwith the resource name of the device to create a  
session.  
Note You use this session in all subsequent function calls throughout the verification  
procedures.  
For more information on using niDMM_init, refer to the NI Digital  
Multimeters Help.  
4. Call niDMM_SelfCal. This step is optional if you have adjusted the  
NI 4070/4072 within the last 24 hours and the temperature has  
remained constant to within 1 °C of the calibration temperature (Tcal).  
Verification Procedures  
You can use the verification procedures described in this section for both  
pre-adjustment and post-adjustment verification. The steps of each  
verification procedure must be performed in the order listed; however, you  
can omit entire sections (for example, the entire Verifying AC Current  
section), if necessary.  
The parameters Range, Resolution, and Sample Interval used in function  
calls throughout this section have floating point values. For example, if  
Range = 1, the floating point value is 1.0. The parameters Trigger Count,  
Sample Count, Array Size, and ParamValue have integer values. Refer  
to the NI Digital Multimeters Help for more information about parameter  
values.  
Note Many of the parameter values listed in this document are expressed in scientific  
notation. Some programming languages do not support the direct entry of numbers in this  
format. Be sure to properly enter these values with the appropriate number of zeros. For  
example, enter the scientific notation number 10e–6 as 0.00001and the number 100e3 as  
100000. If your programming language supports scientific notation, NI recommends that  
you use this feature to minimize possible data entry errors.  
© National Instruments Corporation  
7
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
Verifying DC Voltage  
To verify DC voltage of the NI 4070/4072, complete the following steps:  
1. Plug in the insulated banana plug shorting bar across the HI and LO  
banana plug connectors on the NI 4070/4072.  
2. Wait one minute for the thermal EMF to stabilize.  
3. Call niDMM_reset.  
4. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_VOLTS  
Range = 1  
Resolution = 1e–6  
5. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
6. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
7. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
8. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
9. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_VOLTS  
Range = 10  
Resolution = 10e–6  
10. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
11. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
NI 4070/4072 Calibration Procedure  
8
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
12. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
13. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
14. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_VOLTS  
Range = 100  
Resolution = 100e–6  
15. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
16. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
17. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_VOLTS  
Range = 300  
Resolution = 300e–6  
18. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
19. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
20. Remove the shorting bar from the NI 4070/4072.  
21. Reset the calibrator.  
22. Fasten the connectors on one end of the Fluke 5440 cable to the  
appropriate banana plug connectors of the NI 4070/4072, and fasten  
the connectors on the other end of the cable to the appropriate  
calibrator binding posts. Figure 1 shows the correct connections.  
Table 1 lists the cable connections.  
© National Instruments Corporation  
9
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
1
2
6½-Digit FlexDMM  
OUTPUT  
VΩA  
SENSE  
VΩ  
HI  
INPUT  
300V  
MAX  
V
3
HI  
LO  
HI  
HI  
W
LO  
1A, 250V  
MAX  
AMPS  
LO  
HI  
300V  
MAX  
SENSE  
W 4W  
AUX  
CURRENT  
GUARD  
GROUND  
LO  
AUX  
I/O  
5V  
MAX  
CAT II  
1
NI 4070/4072  
2
Fluke 5700A/5720A Calibrator  
3
Fluke 5440 Cable  
Figure 1. Cable Connections for Voltage and 2-Wire Resistance  
Table 1. Fluke 5440 Cable Connections  
Banana Plug Connector  
(NI 4070/4072)  
Banana Plug Color  
(Fluke 5440 Cable)  
Binding Post Label  
(Fluke 5700A/5720A Calibrator)  
HI  
LO  
Red  
OUTPUT HI  
Black  
Blue  
OUTPUT LO  
V GUARD  
(No connection)  
23. Wait two minutes for the thermal EMF to stabilize.  
24. Generate 0 V on the calibrator.  
25. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_VOLTS  
Range = 0.1  
Resolution = 100e–9  
26. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
NI 4070/4072 Calibration Procedure  
10  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
27. Call niDMM_ConfigureMultiPointwith the following parameters:  
Trigger Count = 1  
Sample Count = 10  
Sample Trigger = NIDMM_VAL_IMMEDIATE  
Sample Interval = –1  
28. Call niDMM_ReadMultiPointwith the following parameters:  
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO  
Array Size = 10  
Average the results by summing the returned reading array of the  
function and dividing by the returned actual number of points. Store  
the result as the 100 mV >10 GΩ mode offset.  
29. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
30. Call niDMM_ConfigureMultiPointwith the following parameters:  
Trigger Count = 1  
Sample Count = 10  
Sample Trigger = NIDMM_VAL_IMMEDIATE  
SampleInterval = –1  
31. Call niDMM_ReadMultiPointwith the following parameters:  
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO  
Array Size = 10  
Average the results by summing the returned reading array of the  
function and dividing by the returned actual number of points. Store  
the result as the 100 mV 10 MΩ mode offset.  
32. Output 100 mV on the calibrator with the range locked to 2.2 V.  
This range prevents a 50 Ω calibrator output resistance from creating  
a voltage divider with the internal resistance of the NI 4070/4072.  
33. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_VOLTS  
Range = 0.1  
Resolution = 100e–9  
© National Instruments Corporation  
11  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
34. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
35. Call niDMM_Read. Subtract the previously stored 100 mV >10 GΩ  
mode offset from this measurement, and verify that the result falls  
between the limits listed in Table 15.  
36. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
37. Call niDMM_Read. Subtract the previously stored 100 mV 10 MΩ  
mode offset from this measurement and verify that the result falls  
between the limits listed in Table 15.  
38. Output –100 mV on the calibrator with the range locked to 2.2 V.  
This range prevents a 50 Ω calibrator output resistance from creating  
a voltage divider with the internal resistance of the NI 4070/4072.  
39. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
40. Call niDMM_Read. Subtract the previously stored 100 mV >10 GΩ  
mode offset from this measurement, and verify that the result falls  
between the limits listed in Table 15.  
41. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
42. Call niDMM_Read. Subtract the previously stored 100 mV 10 MΩ  
mode offset from this measurement and verify that the result falls  
between the limits listed in Table 15.  
43. Output 1 V on the calibrator.  
44. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_VOLTS  
Range = 1  
Resolution = 1e–6  
NI 4070/4072 Calibration Procedure  
12  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
45. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
46. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
47. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
48. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
49. Output –1 V on the calibrator.  
50. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
51. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
52. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
53. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
54. Output 10 V on the calibrator.  
55. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_VOLTS  
Range = 10  
Resolution = 10e–6  
56. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
57. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
© National Instruments Corporation  
13  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
58. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
59. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
60. Output –10 V on the calibrator.  
61. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
62. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
63. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
64. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
65. Output 100 V on the calibrator.  
Caution Avoid touching the connections when generating a high voltage from the  
calibrator.  
66. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_VOLTS  
Range = 100  
Resolution = 100e–6  
67. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling  
niDMM_SetAttributeViReal64with the following parameters:  
Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE  
Attribute_Value = NIDMM_VAL_10_MEGAOHM  
68. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
69. Output –100 V on the calibrator.  
70. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
NI 4070/4072 Calibration Procedure  
14  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
71. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_VOLTS  
Range = 300  
Resolution = 300e–6  
72. Call niDMM_Read. Before you apply the voltage, the DMM must be in  
the 300 V range.  
73. Output 300 V on the calibrator.  
74. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
75. Output –300 V on the calibrator.  
76. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 15.  
77. Reset the calibrator for safety reasons.  
You have completed verifying the DC voltage of the NI 4070/4072. Select  
If you want to continue verifying other modes, go to the Verifying AC  
Voltage section.  
If you do not want to verify other modes and you are performing a  
post-adjustment verification, go to the Completing the Adjustment  
Procedures section.  
If you do not want to verify any additional modes and you are  
performing a pre-adjustment verification, call niDMM_closeto close  
the session.  
Verifying AC Voltage  
To verify AC voltage of the NI 4070/4072, complete the following steps:  
1. Reset the calibrator.  
2. Fasten the connectors on one end of the Fluke 5440 cable to the  
appropriate banana plug connectors on the NI 4070/4072, and fasten  
the connectors on the other end of the cable to the appropriate  
calibrator binding posts. Figure 1 shows the correct connections.  
Table 1 lists the cable connections.  
3. Output 5 mV at 1 kHz on the calibrator.  
4. Call niDMM_resetto reset the NI 4070/4072 to a known state.  
© National Instruments Corporation  
15  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
5. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_AC_VOLTS  
Range = 0.05  
Resolution = 50e–9  
6. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
7. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED  
Range = 0.05  
Resolution = 50e–9  
8. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
9. Output 50 mV at 30 Hz on the calibrator.  
10. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED  
Range = 0.05  
Resolution = 50e–9  
11. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
12. Refer to Table 2 for the appropriate calibrator outputs and parameter  
values as you complete the following steps:  
a. On the calibrator, output the value listed in the Calibrator Output  
column in Table 2 for the current iteration.  
b. Call niDMM_ConfigureMeasurementwith Mode set to  
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown  
in Table 2 for the current iteration.  
c. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
d. Call niDMM_ConfigureMeasurementagain, changing Mode to  
NIDMM_VAL_AC_VOLTS_DCCOUPLED.  
e. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
NI 4070/4072 Calibration Procedure  
16  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
13. Repeat step 12 for each of the remaining iterations shown in Table 2.  
Table 2. niDMM_ConfigureMeasurement Parameters  
Calibrator Output  
Amplitude Frequency  
niDMM_ConfigureMeasurement Parameters  
Iteration  
Function  
NIDMM_VAL_AC_VOLTS  
Range  
0.05  
0.05  
0.05  
0.05  
0.5  
Resolution  
50e–9  
50e–9  
50e–9  
50e–9  
500e–9  
500e–9  
50e–9  
50e–9  
50e–9  
50e–9  
50e–9  
50e–9  
50e–9  
50e–9  
1
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 Hz  
50 Hz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
2
3
4
5
6
7
1 kHz  
1 kHz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
1 kHz  
1 kHz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
0.5  
20 kHz  
20 kHz  
50 kHz  
50 kHz  
100 kHz  
100 kHz  
300 kHz  
300 kHz  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
14. Output 500 mV at 30 Hz on the calibrator.  
15. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED  
Range = 0.5  
Resolution = 500e–9  
16. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
17. Refer to Table 3 for the appropriate calibrator outputs and parameter  
values as you complete the following steps:  
a. On the calibrator, output the value listed in the Calibrator Output  
column in Table 3 for the current iteration.  
b. Call niDMM_ConfigureMeasurementwith Mode set to  
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown  
in Table 3 for the current iteration.  
© National Instruments Corporation  
17  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
c. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
d. Call niDMM_ConfigureMeasurementagain, changing Mode to  
NIDMM_VAL_AC_VOLTS_DCCOUPLED.  
e. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
Table 3. niDMM_ConfigureMeasurement Parameters  
Calibrator Output  
Amplitude Frequency  
niDMM_ConfigureMeasurement Parameters  
Iteration  
Function  
NIDMM_VAL_AC_VOLTS  
Range  
0.5  
0.5  
0.5  
0.5  
5
Resolution  
500e–9  
500e–9  
500e–9  
500e–9  
5e–6  
1
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
50 Hz  
50 Hz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
2
3
4
5
6
7
1 kHz  
1 kHz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
1 kHz  
1 kHz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
5e–6  
20 kHz  
20 kHz  
50 kHz  
50 kHz  
100 kHz  
100 kHz  
300 kHz  
300 kHz  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
500e–9  
500e–9  
500e–9  
500e–9  
500e–9  
500e–9  
500e–9  
500e–9  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
18. Output 5 V at 30 Hz on the calibrator.  
19. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED  
Range = 5  
Resolution = 5e–6  
20. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
NI 4070/4072 Calibration Procedure  
18  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
21. Refer to Table 4 for the appropriate calibrator outputs and parameter  
values as you complete the following steps:  
a. On the calibrator, output the value listed in the Calibrator Output  
column in Table 4 for the current iteration.  
b. Call niDMM_ConfigureMeasurementwith Mode set to  
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown  
in Table 4 for the current iteration.  
c. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
d. Call niDMM_ConfigureMeasurementagain, changing Mode to  
NIDMM_VAL_AC_VOLTS_DCCOUPLED.  
e. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
Table 4. niDMM_ConfigureMeasurement Parameters  
Calibrator Output  
niDMM_ConfigureMeasurement Parameters  
Iteration  
Amplitude  
5 V  
Frequency  
50 Hz  
Function  
NIDMM_VAL_AC_VOLTS  
Range  
5
Resolution  
5e–6  
1
5 V  
50 Hz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
5e–6  
2
3
4
5
6
7
8
5 V  
1 kHz  
5
5e–6  
5 V  
1 kHz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
5e–6  
5 V  
1 kHz  
50  
50  
300  
300  
5
50e–6  
50e–6  
300e–6  
300e–6  
5e–6  
5 V  
1 kHz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5 V  
1 kHz  
5 V  
1 kHz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5 V  
20 kHz  
20 kHz  
50 kHz  
50 kHz  
100 kHz  
100 kHz  
300 kHz  
300 kHz  
5 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
5e–6  
5 V  
5
5e–6  
5 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
5e–6  
5 V  
5
5e–6  
5 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
5e–6  
5 V  
5
5e–6  
5 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
5
5e–6  
22. Output 50 V at 30 Hz on the calibrator.  
© National Instruments Corporation  
19  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
23. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED  
Range = 50  
Resolution = 50e–6  
24. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
25. Refer to Table 5 for the appropriate calibrator outputs and parameter  
values as you complete the following steps:  
a. On the calibrator, output the value listed in the Calibrator Output  
column in Table 5 for the current iteration.  
b. Call niDMM_ConfigureMeasurementwith Mode set to  
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown  
in Table 5 for the current iteration.  
c. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
d. Call niDMM_ConfigureMeasurementagain, changing Mode to  
NIDMM_VAL_AC_VOLTS_DCCOUPLED.  
e. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
Table 5. niDMM_ConfigureMeasurement Parameters  
Calibrator Output  
niDMM_ConfigureMeasurement Parameters  
Function  
NIDMM_VAL_AC_VOLTS  
Iteration  
Amplitude  
50 V  
Frequency  
50 Hz  
Range  
50  
50  
50  
50  
50  
50  
50  
50  
50  
50  
50  
50  
Resolution  
50e–6  
50e–6  
50e–6  
50e–6  
50e–6  
50e–6  
50e–6  
50e–6  
50e–6  
50e–6  
50e–6  
50e–6  
1
50 V  
50 Hz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
2
3
4
5
6
50 V  
1 kHz  
50 V  
1 kHz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50 V  
20 kHz  
20 kHz  
50 kHz  
50 kHz  
100 kHz  
100 kHz  
300 kHz  
300 kHz  
50 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50 V  
50 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50 V  
50 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50 V  
50 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NI 4070/4072 Calibration Procedure  
20  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
26. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED  
Range = 300  
Resolution = 300e–6  
27. Call niDMM_Read. The DMM must be in the 300 V range before you  
apply the voltage.  
28. Output 219 V at 30 Hz on the calibrator.  
29. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
30. Refer to Table 6 for the appropriate calibrator outputs and parameter  
values as you complete the following steps:  
a. On the calibrator, output the value listed in the Calibrator Output  
column in Table 6 for the current iteration.  
b. Call niDMM_ConfigureMeasurementwith Mode set to  
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown  
in Table 6 for the current iteration.  
c. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
d. Call niDMM_ConfigureMeasurementagain, changing Mode to  
NIDMM_VAL_AC_VOLTS_DCCOUPLED.  
e. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 16.  
Table 6. niDMM_ConfigureMeasurement Parameters  
Calibrator Output  
niDMM_ConfigureMeasurement Parameters  
Iteration  
Amplitude  
219 V  
219 V  
219 V  
219 V  
219 V  
219 V  
219 V  
219 V  
70 V  
Frequency  
50 Hz  
Function  
NIDMM_VAL_AC_VOLTS  
Range  
300  
300  
300  
300  
300  
300  
300  
300  
300  
300  
Resolution  
300e–6  
300e–6  
300e–6  
300e–6  
300e–6  
300e–6  
300e–6  
300e–6  
300e–6  
300e–6  
1
50 Hz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
2
3
4
5
1 kHz  
1 kHz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
20 kHz  
20 kHz  
50 kHz  
50 kHz  
300 kHz  
300 kHz  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
70 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
© National Instruments Corporation  
21  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
31. Reset the calibrator for safety reasons.  
You have completed verifying the AC voltage of the NI 4070/4072. Select  
If you want to continue verifying other modes, go to the Verifying  
4-Wire Resistance section.  
If you do not want to verify other modes and you are performing a  
post-adjustment verification, go to the Completing the Adjustment  
Procedures section.  
If you do not want to verify any additional modes and you are  
performing a pre-adjustment verification, call niDMM_closeto close  
the session.  
Verifying 4-Wire Resistance  
To verify the 4-wire resistance of the NI 4070/4072, complete the  
following steps:  
1. Reset the calibrator.  
2. Fasten the connectors on one end of each Fluke 5440 cable to the  
appropriate banana plug connectors on the NI 4070/4072. Fasten the  
connectors on the other end of each Fluke 5440 cable to the appropriate  
calibrator binding posts. Figure 2 shows the Fluke 5440 cables. Table 7  
lists the cable connections.  
1
2
6½-Digit FlexDMM  
OUTPUT  
VΩA  
SENSE  
VΩ  
HI  
INPUT  
300V  
MAX  
V
HI  
LO  
HI  
HI  
W
LO  
1A, 250V  
MAX  
AMPS  
LO  
HI  
3
300V  
MAX  
SENSE  
W 4W  
AUX  
CURRENT  
GUARD  
GROUND  
LO  
AUX  
I/O  
5V  
MAX  
CAT II  
1
NI 4070/4072  
2
Fluke 5700A/5720A Calibrator  
3
Fluke 5440 Cables  
Figure 2. Cable Connections for 4-Wire Resistance  
NI 4070/4072 Calibration Procedure  
22  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
Table 7. Fluke 5440 Cable Connections  
Fluke 5440  
Cable Identification  
Banana Plug Connector  
(NI 4070/4072)  
Banana Plug Color  
(Fluke 5440 Cable)  
Binding Post  
(Fluke 5700A/5720A Calibrator)  
First cable  
HI  
Red  
OUTPUT HI  
OUTPUT LO  
V GUARD  
SENSE HI  
SENSE LO  
V GUARD  
LO  
Black  
Blue  
Red  
(No connection)  
HI SENSE  
Second cable  
LO SENSE  
Black  
Blue  
(No connection)  
3. Wait two minutes for the thermal EMF to stabilize if the Fluke 5440  
cables were not previously connected in this configuration.  
4. Call niDMM_reset.  
5. Refer to Table 8 for the appropriate calibrator output and function  
parameter values as you complete the following steps:  
a. On the calibrator, output the value listed in the Calibrator Output  
column in Table 8 for the current iteration. Make sure that the  
external sense is turned on but 2-wire compensation is turned off.  
Note After setting the calibrator output to 0 Ω in the seventh iteration, you do not need to  
continually set the calibrator to 0 Ω for iterations 8 through 12.  
b. Call niDMM_ConfigureMeasurementwith the parameters set  
as shown in Table 8 for the current iteration.  
c. Call niDMM_ConfigureOffsetCompOhmswith  
OffsetCompOhms set to either  
NIDMM_VAL_OFFSET_COMP_OHMS_ONor  
NIDMM_VAL_OFFSET_COMP_OHMS_OFFaccording to Table 8 for  
the current iteration.  
d. Call niDMM_Read. Verify that this measurement falls between the  
tolerances listed in Table 17. Tolerances are provided instead of  
absolute limits because your calibrator will have different discrete  
resistance values.  
© National Instruments Corporation  
23  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
6. Repeat step 5 for each of the remaining iterations listed in Table 8.  
Table 8. niDMM_ConfigureMeasurement Parameters  
niDMM_ConfigureMeasurement Parameters  
Calibrator  
Output  
Iteration  
Function  
Range  
10e6  
1e6  
Resolution  
10  
OffsetCompOhms  
1
2
10 MΩ  
1 MΩ  
100 kΩ  
10 kΩ  
1 kΩ  
100 Ω  
0 Ω  
NIDMM_VAL_4_WIRE_RES  
NIDMM_VAL_4_WIRE_RES  
NIDMM_VAL_4_WIRE_RES  
NIDMM_VAL_4_WIRE_RES  
NIDMM_VAL_4_WIRE_RES  
NIDMM_VAL_4_WIRE_RES  
NIDMM_VAL_4_WIRE_RES  
NIDMM_VAL_4_WIRE_RES  
NIDMM_VAL_4_WIRE_RES  
NIDMM_VAL_4_WIRE_RES  
NIDMM_VAL_4_WIRE_RES  
NIDMM_VAL_4_WIRE_RES  
OFF  
OFF  
OFF  
ON  
1
3
100e3  
10e3  
1e3  
0.1  
4
0.01  
1e–3  
100e–6  
10  
5
ON  
6
100  
ON  
7
10e6  
1e6  
OFF  
OFF  
OFF  
ON  
8
0 Ω  
1
9
0 Ω  
100e3  
10e3  
1e3  
0.1  
10  
11  
12  
0 Ω  
0.01  
1e–3  
100e–6  
0 Ω  
ON  
100  
ON  
You have completed verifying the 4-wire resistance of the NI 4070/4072.  
If you want to continue verifying other modes, go to the Verifying  
2-Wire Resistance section.  
If you do not want to verify other modes and you are performing a  
post-adjustment verification, go to the Completing the Adjustment  
Procedures section.  
If you do not want to verify any additional modes and you are  
performing a pre-adjustment verification, call niDMM_closeto close  
the session.  
Verifying 2-Wire Resistance  
To verify the 2-wire resistance of the NI 4070/4072, complete the  
following steps:  
1. Plug in the insulated banana plug shorting bar across the HI and LO  
banana plug connectors on the NI 4070/4072.  
2. Wait one minute for the thermal EMF to stabilize.  
3. Call niDMM_reset.  
NI 4070/4072 Calibration Procedure  
24  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
4. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 10e3  
Resolution = 0.01  
5. Call niDMM_ConfigureOffsetCompOhmswith OffsetCompOhms  
set to NIDMM_VAL_OFFSET_COMP_OHMS_ON.  
6. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 18.  
7. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 1e3  
Resolution = 1e–3  
8. Call niDMM_ConfigureOffsetCompOhmswith OffsetCompOhms  
set to NIDMM_VAL_OFFSET_COMP_OHMS_ON.  
9. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 18.  
10. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 100  
Resolution = 100e–6  
11. Call niDMM_ConfigureOffsetCompOhmswith OffsetCompOhms  
set to NIDMM_VAL_OFFSET_COMP_OHMS_ON.  
12. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 18.  
13. Remove the shorting bar from the NI 4070/4072.  
14. Reset the calibrator.  
15. Fasten the connectors on one end of the Fluke 5440 cable to the  
NI 4070/4072, and fasten the connectors on the other end of the cable  
to the appropriate calibrator binding posts. Figure 1 shows the correct  
connections. Table 1 lists the cable connections.  
16. Wait two minutes for the thermal EMF to stabilize if the Fluke 5440  
cable was not previously used in this configuration.  
17. Output 0 Ω on the calibrator with 2-wire compensation turned on  
but with external sense turned off.  
18. Call niDMM_resetto reset the NI 4070/4072 to a known state.  
© National Instruments Corporation  
25  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
19. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 100e6  
Resolution = 100  
20. Call niDMM_Readand store the result as the 100 MΩ range offset.  
21. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 10e6  
Resolution = 10  
22. Call niDMM_Readand store the result as the 10 MΩ range offset.  
23. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 1e6  
Resolution = 1  
24. Call niDMM_Readand store the result as the 1 MΩ range offset.  
25. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 100e3  
Resolution = 0.1  
26. Call niDMM_ConfigureMultiPointwith the following parameters:  
Trigger Count = 1  
Sample Count = 4  
Sample Trigger = NIDMM_VAL_IMMEDIATE  
Sample Interval = –1  
27. Call niDMM_ReadMultiPointwith the following parameters:  
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO  
Array Size = 4  
Average the results by summing the returned reading array of the  
function and dividing by the returned actual number of points.  
Store the result as the 100 kΩ range offset.  
NI 4070/4072 Calibration Procedure  
26  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
28. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 10e3  
Resolution = 0.01  
29. Call niDMM_ConfigureMultiPointwith the following parameters:  
Trigger Count = 1  
Sample Count = 4  
Sample Trigger = NIDMM_VAL_IMMEDIATE  
Sample Interval = –1  
30. Call niDMM_ReadMultiPointwith the following parameters:  
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO  
Array Size = 4  
Average the results by summing the returned reading array of the  
function and dividing by the returned actual number of points.  
Store the result as the 10 kΩ range offset.  
31. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 1e3  
Resolution = 1e–3  
32. Call niDMM_ConfigureMultiPointwith the following parameters:  
Trigger Count = 1  
Sample Count = 4  
Sample Trigger = NIDMM_VAL_IMMEDIATE  
Sample Interval = –1  
33. Call niDMM_ReadMultiPointwith the following parameters:  
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO  
Array Size = 4  
Average the results by summing the returned reading array of the  
function and dividing by the returned actual number of points.  
Store the result as the 1 kΩ range offset.  
34. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 100  
Resolution = 100e–6  
© National Instruments Corporation  
27  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
35. Call niDMM_ConfigureMultiPointwith the following parameters:  
Trigger Count = 1  
Sample Count = 10  
Sample Trigger = NIDMM_VAL_IMMEDIATE  
Sample Interval = –1  
36. Call niDMM_ReadMultiPointwith the following parameters:  
Maximum Time = NIDMM_VAL_TIME_LIMIT_AUTO  
Array Size = 10  
Average the results by summing the returned reading array of the  
function and dividing by the returned actual number of points.  
Store the result as the 100 Ω range offset.  
37. Output 100 MΩ on the calibrator without external sense or 2-wire  
compensation.  
38. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 100e6  
Resolution = 100  
39. Call niDMM_Read. Subtract the previously stored 100 MΩ range offset  
from this measurement. Verify that the result falls between the  
tolerances listed in Table 18.  
40. Output 10 MΩ on the calibrator without external sense or 2-wire  
compensation.  
41. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 10e6  
Resolution = 10  
42. Call niDMM_Read. Subtract the previously stored 10 MΩ range offset  
from this measurement. Verify that the result falls between the  
tolerances listed in Table 18.  
43. Output 1 MΩ on the calibrator without external sense or 2-wire  
compensation.  
44. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 1e6  
Resolution = 1  
NI 4070/4072 Calibration Procedure  
28  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
45. Call niDMM_Read. Subtract the previously stored 1 MΩ range offset  
from this measurement. Verify that the result falls between the  
tolerances listed in Table 18.  
46. Output 100 kΩ on the calibrator without external sense or 2-wire  
compensation.  
47. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 100e3  
Resolution = 0.1  
48. Call niDMM_Read. Subtract the previously stored 100 kΩ range offset  
from this measurement. Verify that the result falls between the  
tolerances listed in Table 18.  
49. Output 10 kΩ on the calibrator with 2-wire compensation turned on  
but with external sense turned off.  
50. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 10e3  
Resolution = 0.01  
51. Call niDMM_Read. Subtract the previously stored 10 kΩ range offset  
from this measurement. Verify that the result falls between the  
tolerances listed in Table 18.  
52. Output 1 kΩ on the calibrator with 2-wire compensation turned on  
but with external sense turned off.  
53. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 1e3  
Resolution = 1e–3  
54. Call niDMM_Read. Subtract the previously stored 1 kΩ range offset  
from this measurement. Verify that the result falls between the  
tolerances listed in Table 18.  
55. Output 100 Ω on the calibrator with 2-wire compensation turned on  
but with external sense turned off.  
56. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_2_WIRE_RES  
Range = 100  
Resolution = 100e–6  
© National Instruments Corporation  
29  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
57. Call niDMM_Read. Subtract the previously calculated 100 Ω range  
offset from this measurement. Verify that the result falls between the  
tolerances listed in Table 18.  
You have completed verifying the 2-wire resistance of the NI 4070/4072.  
If you want to continue verifying other modes, go to the Verifying DC  
Current section.  
If you do not want to verify other modes and you are performing a  
post-adjustment verification, go to the Completing the Adjustment  
Procedures section.  
If you do not want to verify any additional modes and you are  
performing a pre-adjustment verification, call niDMM_closeto close  
the session.  
Verifying DC Current  
To verify the DC current of the NI 4070/4072, complete the following steps:  
1. Reset the calibrator.  
2. Fasten the connectors on one end of the Fluke 5440 cable to the  
NI 4070/4072 HI SENSE and LO banana plug connectors, and connect  
the connectors on the other end of the cable to the HI and LO calibrator  
binding posts. Figure 3 shows the correct connections. Table 9 lists the  
cable connections.  
1
2
6½-Digit FlexDMM  
OUTPUT  
VΩA  
SENSE  
VΩ  
HI  
INPUT  
300V  
MAX  
V
3
HI  
LO  
HI  
HI  
W
LO  
1A, 250V  
MAX  
AMPS  
LO  
HI  
300V  
MAX  
SENSE  
W 4W  
AUX  
CURRENT  
GUARD  
GROUND  
LO  
AUX  
I/O  
5V  
MAX  
CAT II  
1
NI 4070/4072  
2
Fluke 5700A/5720A Calibrator  
3
Fluke 5440 Cable  
Figure 3. Cable Connections for Current  
NI 4070/4072 Calibration Procedure  
30  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
Table 9. Fluke 5440 Cable Connections  
Banana Plug Connector  
(NI 4070/4072)  
Banana Plug Color  
(Fluke 5440 Cable)  
Binding Post  
(Fluke 5700A/5720A Calibrator)  
HI SENSE  
Red  
OUTPUT HI  
LO  
Black  
Blue  
OUTPUT LO  
V GUARD  
(No connection)  
3. Call niDMM_resetto reset the NI 4070/4072 to a known state.  
4. Set the current output on the calibrator to NORM and output 0 A.  
5. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_CURRENT  
Range = 0.02  
Resolution = 20e–9  
6. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 19.  
7. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_CURRENT  
Range = 0.2  
Resolution = 200e–9  
8. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 19.  
9. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_CURRENT  
Range = 1  
Resolution = 1e–6  
10. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 19.  
11. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_CURRENT  
Range = 0.02  
Resolution = 20e–9  
12. Call niDMM_Readto configure the NI 4070/4072 for a current mode  
before applying current.  
© National Instruments Corporation  
31  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
13. Output 20 mA on the calibrator.  
14. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 19.  
15. Output –20 mA on the calibrator.  
16. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 19.  
17. Output 200 mA on the calibrator.  
18. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_CURRENT  
Range = 0.2  
Resolution = 200e–9  
19. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 19.  
20. Output –200 mA on the calibrator.  
21. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 19.  
22. Output 1 A on the calibrator.  
23. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_CURRENT  
Range = 1  
Resolution = 1e–6  
24. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 19.  
25. Output –1 A on the calibrator.  
26. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 19.  
You have completed verifying the DC current of the NI 4070/4072. Select  
If you want to continue verifying other modes, go to the Verifying AC  
Current section.  
If you do not want to verify other modes and you are performing a  
post-adjustment verification, go to the Completing the Adjustment  
Procedures section.  
If you do not want to verify any additional modes and you are  
performing a pre-adjustment verification, call niDMM_closeto close  
the session.  
NI 4070/4072 Calibration Procedure  
32  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Verifying AC Current  
To verify the AC current of the NI 4070/4072, complete the following  
steps:  
1. Reset the calibrator.  
2. Fasten the connectors on one end of the Fluke 5440 cable to the  
NI 4070/4072 HI SENSE and LO banana plug connectors, and fasten  
the connectors on the other end of the cable to the HI and LO calibrator  
binding posts. Figure 3 shows the correct connections. Table 9 lists the  
cable connections.  
3. Call niDMM_resetto reset the NI 4070/4072 to a known state.  
4. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_AC_CURRENT  
Range = 0.01  
Resolution = 10e–9  
5. Call niDMM_Readto configure the NI 4070/4072 for a current mode  
before applying current.  
6. Output 1 mA at 1 kHz on the calibrator with the current output set  
to NORM.  
7. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 20.  
8. Output 10 mA at 1 kHz on the calibrator.  
9. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 20.  
10. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_AC_CURRENT  
Range = 0.1  
Resolution = 100e–9  
11. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 20.  
12. Output 100 mA at 1 kHz on the calibrator.  
13. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 20.  
© National Instruments Corporation  
33  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
14. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_AC_CURRENT  
Range = 1  
Resolution = 1e–6  
15. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 20.  
16. Output 1 A at 1 kHz on the calibrator.  
17. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 20.  
You have completed verifying the AC current of the NI 4070/4072. Select  
If you want to continue verifying other modes, go to the Verifying  
Frequency section.  
If you do not want to verify other modes and you are performing a  
post-adjustment verification, go to the Completing the Adjustment  
Procedures section.  
If you do not want to verify any additional modes and you are  
performing a pre-adjustment verification, call niDMM_closeto close  
the session.  
Verifying Frequency  
Notes The frequency of the NI 4070/4072 is not user adjustable. If this verification  
procedure indicates that the frequency is out of specification, return the NI 4070/4072  
to NI for repair.  
This verification procedure is optional and requires additional test  
equipment. If you do not want to verify frequency, select one of the  
following options:  
If you are calibrating an NI 4072 and want to continue verifying other  
modes, go to the Verifying Capacitance and Inductance (NI 4072  
Only) section.  
If you do not want to verify other modes and are performing a  
post-adjustment verification, go to the Completing the Adjustment  
Procedures section.  
If you do not want to verify any additional modes and you are  
performing a pre-adjustment verification, call niDMM_closeto close  
the session.  
NI 4070/4072 Calibration Procedure  
34  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
To verify the frequency of the NI 4070/4072, complete the following steps:  
1. Remove all connections from the NI 4070/4072.  
Note Polarity is not important in steps 2, 3, and 5.  
2. Connect one end of the coaxial cable to the Pomona 4892 double  
banana plug.  
3. Tighten the other end of the coaxial cable in the screw terminal  
channels 5 and 39 of the TB-2715 terminal block.  
4. Connect the TB-2715 with the coaxial cable attached to the NI 6608.  
5. Plug the Pomona 4892 into the HI and LO terminals of the  
NI 4070/4072.  
6. Call niDMM_resetto reset the NI 4070/4072 to a known state.  
7. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_FREQ  
Range = 1  
Resolution = 0  
8. Call niDMM_ConfigureFrequencyVoltageRangewith  
Voltage Range set to 5.  
9. Call GPCTR_Controlwith the following parameters:  
deviceNumber = the device number of the NI 6608, assigned by  
Measurement & Automation Explorer (MAX)  
gpctrNum = ND_COUNTER_0  
action = ND_RESET  
10. Call GPCTR_Set_Applicationwith the following parameters:  
deviceNumber = the device number of the NI 6608, assigned  
by MAX  
gpctrNum = ND_COUNTER_0  
application = ND_PULSE_TRAIN_GNR  
11. Call GPCTR_Change_Parameterwith the following parameters:  
deviceNumber = the device number of the NI 6608, assigned  
by MAX  
gpctrNum = ND_COUNTER_0  
paramID = ND_COUNT_1  
paramValue = 10e6  
© National Instruments Corporation  
35  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
         
12. Call GPCTR_Change_Parameterwith the following parameters:  
deviceNumber = the device number of the NI 6608, assigned  
by MAX  
gpctrNum = ND_COUNTER_0  
paramID = ND_COUNT_2  
paramValue = 10e6  
13. Call GPCTR_Controlwith the following parameters:  
deviceNumber = the device number of the NI 6608, assigned  
by MAX  
gpctrNum = ND_COUNTER_0  
action = ND_PROGRAM  
14. Call niDMM_Read. Verify that this measurement falls between the  
limits listed in Table 21.  
15. Call GPCTR_Controlwith the following parameters:  
deviceNumber = the device number of the NI 6608, assigned  
by MAX  
gpctrNum = ND_COUNTER_0  
action = ND_RESET  
16. Repeat steps 10 through 15 with the following modification: in  
steps 11 and 12, change paramValue to 500when you call the  
function GPCTR_Change_Parameter.  
17. Repeat steps 10 through 15 with the following modification: in  
You have completed verifying the frequency of the NI 4070/4072. Select  
one of the following options:  
If you are calibrating an NI 4072 and want to continue verifying other  
modes, go to the Verifying Capacitance and Inductance (NI 4072  
Only) section.  
If you do not want to verify other modes and you are performing a  
post-adjustment verification, go to the Completing the Adjustment  
Procedures section.  
If you do not want to verify any additional modes and you are  
performing a pre-adjustment verification, call niDMM_closeto close  
the session.  
NI 4070/4072 Calibration Procedure  
36  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
Verifying Capacitance and Inductance (NI 4072 Only)  
This verification procedure only applies to the NI 4072 and requires  
additional test equipment, as indicated in the Additional Requirements for  
the NI 4072 section.  
Note The NI 4072 inductance accuracy is theoretically verified if the capacitance  
accuracy meets the specifications. If you have access to precision inductors, you can verify  
the inductance measurements by comparing your results with the published accuracy  
specifications.  
NI suggests using traceable capacitor standards with low thermal drift. You  
can use different verification capacitors to verify each capacitance range.  
You can verify two ranges with the same verification capacitor as long as  
its value is 10% of the higher capacitor range. For example, you can use a  
1 nF verification capacitor to test both the 10 nF and 1 nF ranges.  
After taking each measurement, verify that the measurement falls between  
the tolerances listed in Table 22. Tolerances are provided instead of  
absolute limits, because you can use capacitance verification values other  
than the values suggested, or the calibrated value may differ slightly from  
the nominal capacitance (for example, 272.43 pF instead of 270.00 pF).  
The tolerances shown in Table 22 correspond to the NI 4072 accuracy  
specifications.  
The following verification procedure assumes the use of verification  
capacitors with the following values: 270 pF, 1 nF, 100 nF, 10 μF, and  
1000 μF.  
The configuration of the cables and fixtures should be consistent  
throughout each measurement. If you are using cables to connect the  
verification capacitors to the NI 4072 banana plug connectors, minimize  
noise by ensuring that the cables remain fixed and do not move during the  
measurement.  
Keep direct contact with the verification capacitors to a minimum so that  
they are constantly kept at the ambient temperature. After connecting a  
capacitor to the NI 4072 terminals, NI recommends waiting 30 seconds for  
the capacitor temperature to stabilize.  
Note You should know the total capacitance up to the banana connectors that plug into the  
NI 4072 before performing the verification procedure.  
© National Instruments Corporation  
37  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
To verify the capacitance measurements of the NI 4072, complete the  
following steps:  
1. Disconnect any fixtures or cables from the NI 4072.  
2. Call niDMM_resetto reset the NI 4070/4072 to a known state.  
3. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_CAPACITANCE  
Range = 300e-12  
Resolution = 50e-15  
4. Set the number of averages of the NI 4072 to 20by calling  
niDMM_SetAttributeViInt32with the following parameters:  
Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE  
Attribute_Value = 20  
Note This measurement corresponds to a 0 pF capacitance.  
5. Call niDMM_Read. Verify that this measurement falls between the  
tolerances listed in Table 22.  
6. Plug in the insulated banana plug shorting bar across the HI and LO  
banana plug connectors of the NI 4072.  
7. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_INDUCTANCE  
Range = 10e-6  
Resolution = 1e-9  
8. Set the number of averages of the NI 4072 to 40by calling  
niDMM_SetAttributeViInt32with the following parameters:  
Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE  
Attribute_Value = 40  
Note This measurement corresponds to a 0 μH inductance.  
9. Call niDMM_Read. Verify that this measurement falls between the  
tolerances listed in Table 22.  
10. Remove the shorting bar and plug the 270 pF verification capacitor  
into the HI and LO banana plug connectors of the NI 4072. Remember  
to wait 30 seconds for the temperature to stabilize before performing  
the next step.  
NI 4070/4072 Calibration Procedure  
38  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
11. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_CAPACITANCE  
Range = 300e-12  
Resolution = 50e-15  
12. Set the number of averages of the NI 4072 to 20by calling  
niDMM_SetAttributeViInt32with the following parameters:  
Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE  
Attribute_Value = 20  
13. Call niDMM_Read. Verify that this measurement falls between the  
tolerances listed in Table 22.  
Note If you use capacitance verification values that differ from the values listed in  
Table 10, verify that each measurement falls between the tolerances listed in Table 22.  
The tolerances shown in Table 22 correspond to the NI 4072 accuracy specifications.  
14. Remove the 270 pF verification capacitor, and plug the 1 nF  
verification capacitor into the HI and LO banana plug connectors of the  
NI 4072.  
15. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_CAPACITANCE  
Range = 1e-9  
Resolution = 100e-15  
16. Set the number of averages of the NI 4072 to 20by calling  
niDMM_SetAttributeViInt32with the following parameters:  
Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE  
Attribute_Value = 20  
Note If you use capacitance verification values that differ from the values listed in  
Table 10, verify that each measurement falls between the tolerances listed in Table 22.  
The tolerances shown in Table 22 correspond to the NI 4072 accuracy specifications.  
17. Call niDMM_Read. Verify that this measurement falls between the  
tolerances listed in Table 22.  
18. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_CAPACITANCE  
Range = 10e-9  
Resolution = 1e-12  
© National Instruments Corporation  
39  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
19. Set the number of averages of the NI 4072 to 20by calling  
niDMM_SetAttributeViInt32with the following parameters:  
Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE  
Attribute_Value = 20  
Note If you use capacitance verification values that differ from the values listed in  
Table 10, verify that each measurement falls between the tolerances listed in Table 22.  
The tolerances shown in Table 22 correspond to the NI 4072 accuracy specifications.  
20. Call niDMM_Read. Verify that this measurement falls between the  
tolerances listed in Table 22.  
21. Remove the verification capacitor, and plug into the HI and LO banana  
plug connectors of the NI 4072 the next capacitor to be verified,  
according to Table 10.  
22. Repeat steps 18 through 21, using the parameters shown in  
Table 10 for niDMM_ConfigureMeasurementand  
NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGEfor all verification  
capacitors listed.  
Note If you use capacitance verification values that differ from the values listed in  
Table 10, verify that each measurement falls between the tolerances listed in Table 22.  
The tolerances shown in Table 22 correspond to the NI 4072 accuracy specifications.  
Table 10. niDMM_ConfigureMeasurement Parameters  
niDMM Configure Measurement Parameters  
Value of  
Verification Capacitor  
Range  
100e-9  
1e-6  
Resolution  
10e-12  
100e-12  
1e-9  
Number of Averages  
100 nF  
20  
20  
20  
3
10 uF  
10e-6  
100e-6  
1e-3  
10e-9  
1000 uF  
100e-9  
1e-6  
3
10e-3  
3
NI 4072. Select one of the following options:  
If you are performing a pre-adjustment verification, call  
niDMM_closeto close the session.  
If you are performing a post-adjustment verification, go to the  
Completing the Adjustment Procedures section.  
NI 4070/4072 Calibration Procedure  
40  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
Adjustment Procedures  
This section explains how to adjust the NI 4070/4072. You can choose to  
perform these adjustment procedures with or without performing the  
verification procedures first.  
The parameters Range, Resolution, Expected Measurement, and  
Frequency used in function calls in this section have floating point values.  
For example, if Range = 1, the floating point value is 1.0. Refer to the  
NI Digital Multimeters Help for more information about parameter values.  
Note NI recommends repeating the verification procedures after you perform these  
adjustment procedures. Reverification ensures that the device you have calibrated is  
operating within specifications after adjustments.  
Caution If you skip any of the steps within a section of the adjustment procedures,  
NI-DMM does not allow you to store your new calibration coefficients. Instead, NI-DMM  
restores the original coefficients to the EEPROM.  
Setting Up the Test Equipment  
If you have not already set up the test equipment, complete the following  
steps:  
1. Remove all connections from the four input banana plug connectors on  
the NI 4070/4072.  
2. Verify that the calibrator has been calibrated within the time limits  
specified in the Required Test Equipment section, and that DC zeros  
calibration has been performed within the last 30 days. Consult the  
Fluke 5700A/5720A user documentation for instructions on  
calibrating these devices.  
Note Ensure that the calibrator is warmed up for at least 60 minutes before you begin this  
procedure.  
3. Reset the calibrator.  
4. If you have not already done so, allow the NI 4070/4072 to warm up  
for 60 minutes within a powered-on PXI chassis or PC.  
© National Instruments Corporation  
41  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
Adjusting DC Voltage and Resistance  
To adjust the DC voltage and resistance of the NI 4070/4072, complete the  
following steps:  
1. Fasten the connectors on one end of the Fluke 5440 cable to the  
appropriate banana plug connectors on the NI 4070/4072, and fasten  
the connectors on the other end of the cable to the appropriate  
calibrator binding posts. Figure 1 shows the correct connections.  
Table 1 lists the cable connections.  
2. Wait two minutes for the thermal EMF to stabilize if the cable was not  
previously connected in this configuration.  
3. Call niDMM_InitExtCalwith the resource descriptor of the  
NI 4070/4072 and your valid user password to output a calibration  
session (Cal Session) that you can use to perform NI-DMM  
calibration or regular measurement functions.  
Note You will use Cal Session in all subsequent function calls.  
Note The default user password for adjusting the NI 4070/4072 is NI. Use  
niDMM_SetCalPasswordto change the password.  
4. Call niDMM_ConfigurePowerLineFrequencywith PowerLine  
Frequency set to 50or 60, depending on the power line frequency  
(in hertz) that your instruments are powered from; select 50for  
400 Hz power line frequencies.  
5. Output 100 mV on the calibrator with the range locked to 2.2 V.  
6. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_DC_VOLTS  
Range = 0.1  
Input Resistance = NIDMM_VAL_10_MEGAOHM  
Expected Measurement = 0.1  
7. Output –100 mV on the calibrator.  
8. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_DC_VOLTS  
Range = 0.1  
Input Resistance = NIDMM_VAL_10_MEGAOHM  
Expected Measurement = –0.1  
9. Output 10 V on the calibrator.  
NI 4070/4072 Calibration Procedure  
42  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
10. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_DC_VOLTS  
Range = 10  
Input Resistance = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
Expected Measurement = 10  
11. Output –10 V on the calibrator.  
12. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_DC_VOLTS  
Range = 10  
Input Resistance = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
Expected Measurement = –10  
13. Disconnect the Fluke 5440 cable from the NI 4070/4072 banana plug  
connectors, leaving the other end of the cable connected to the  
calibrator binding posts.  
14. Plug in the insulated banana plug shorting bar across the HI and LO  
banana plug connectors of the NI 4070/4072.  
15. Wait two minutes for the thermal EMF to stabilize.  
16. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_DC_VOLTS  
Range = 10  
Input Resistance = NIDMM_VAL_GREATER_THAN_10_GIGAOHM  
17. Call niDMM_CalAdjustMiscwith Type set to  
NIDMM_EXTCAL_MISCCAL_VREF.  
18. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_DC_VOLTS  
Range = 0.1  
Input Resistance = NIDMM_VAL_10_MEGAOHM  
19. Remove the shorting bar, and plug the Fluke 5440 cable back into the  
NI 4070/4072 banana plug connectors, as shown in Figure 1.  
20. Wait one minute for the thermal EMF to stabilize.  
21. Output 10 MΩ from the calibrator without external sense.  
22. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 10e6  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = the display on the calibrator for 10 MΩ  
© National Instruments Corporation  
43  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
23. Output 0 Ω from the calibrator without external sense or 2-wire  
compensation.  
24. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 10e6  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = the display on the calibrator for 0 Ω  
25. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 10e6  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
26. Disconnect the Fluke 5440 cable from the NI 4070/4072.  
27. Call niDMM_CalAdjustMiscwith Type set to  
NIDMM_EXTCAL_MISCCAL_ZINT.  
28. Call niDMM_CalAdjustMiscwith Type set to  
NIDMM_EXTCAL_MISCCAL_2WIRELEAKAGE.  
29. On the NI 4070/4072, plug a Pomona B-4 banana cable from the HI  
input to the HI SENSE input. Plug another Pomona B-4 banana cable  
from the LO input to the LO SENSE input.  
Caution Make sure that the insulation of these cables does not touch.  
30. Call niDMM_CalAdjustMiscwith Type set to  
NIDMM_EXTCAL_MISCCAL_4WIRELEAKAGE.  
31. Remove the banana cables, and plug the two sets of Fluke 5440 cables  
into the appropriate banana plug connectors on the NI 4070/4072,  
as shown in Figure 2 for 4-wire resistance.  
32. Wait two minutes for the thermal EMF to stabilize.  
33. Output 100 MΩ from the calibrator without external sense.  
34. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 100e6  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = the display on the calibrator for 100 MΩ  
35. Output 0 Ω from the calibrator without external sense or 2-wire  
compensation.  
NI 4070/4072 Calibration Procedure  
44  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
36. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 100e6  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = the display on the calibrator for 0 Ω  
37. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 100e6  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
38. Output 100 kΩ on the calibrator with external sense turned on  
but without 2-wire compensation.  
39. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_4_WIRE_RES  
Range = 100e3  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = the display on the calibrator for 100 kΩ  
40. Output 0 Ω on the calibrator with external sense turned on but without  
2-wire compensation.  
41. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_4_WIRE_RES  
Range = 100e3  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = the display on the calibrator for 0 Ω  
42. Output 10 kΩ on the calibrator with external sense turned on  
but without 2-wire compensation.  
43. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_4_WIRE_RES  
Range = 10e3  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = the display on the calibrator for 10 kΩ  
44. Output 0 Ω on the calibrator with external sense turned on but without  
2-wire compensation.  
45. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_4_WIRE_RES  
Range = 100e3  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
© National Instruments Corporation  
45  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
46. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_4_WIRE_RES  
Range = 10e3  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
47. Call niDMM_CalAdjustMiscwith Type set to  
NIDMM_EXTCAL_MISCAL_RREF.  
48. Call niDMM_SelfCalto self-calibrate the NI 4070/4072.  
49. Output 0 Ω on the calibrator with external sense turned on but with  
2-wire compensation turned off.  
50. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_4_WIRE_RES  
Range = 10e6  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
51. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_4_WIRE_RES  
Range = 1e6  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
52. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_4_WIRE_RES  
Range = 1e3  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
53. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_4_WIRE_RES  
Range = 100  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
54. Remove the Fluke 5440 cables from the NI 4070/4072, leaving the  
other end of the cables connected to the calibrator.  
55. Plug in the insulated shorting bar across the HI and LO banana plug  
connectors of the NI 4070/4072.  
56. Wait two minutes for the thermal EMF to stabilize.  
57. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 10e6  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
NI 4070/4072 Calibration Procedure  
46  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
58. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 1e6  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
59. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 100e3  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
60. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 10e3  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
61. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 1e3  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
62. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_2_WIRE_RES  
Range = 100  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
63. Call niDMM_CalAdjustMiscwith Type set to  
NIDMM_EXTCAL_MISCCAL_SECTION.  
You have completed adjusting the DC voltage and resistance modes of the  
If you are performing additional adjustments, refer to the following  
sections, as applicable:  
Adjusting AC Voltage (AC- and DC-Coupled) Modes  
Adjusting Current Modes  
Adjusting Capacitance and Inductance (NI 4072 Only)  
Caution For the NI 4072, adjusting the capacitance and inductance is required. Skipping  
this step causes an incorrect adjustment of the device.  
© National Instruments Corporation  
47  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
If you are not performing additional adjustments, refer to one of the  
following sections:  
Verification Procedures—to verify your new calibration  
coefficients before saving them to the EEPROM  
Completing the Adjustment Procedures—if you do not want to  
Adjusting AC Voltage (AC- and DC-Coupled) Modes  
Note If you do not use the AC voltage modes for any measurements, or the accuracy of  
these modes is irrelevant, you can skip this section in the calibration procedure and go  
directly to the Adjusting Current Modes section.  
To adjust the AC voltage of the NI 4070/4072, complete the following  
steps:  
1. Reset the calibrator.  
2. Fasten the connectors on one end of the Fluke 5440 cable into the  
appropriate banana plug connectors on the NI 4070/4072, and fasten  
the connectors on the other end of the cable to the appropriate  
calibrator binding posts. Figure 1 shows the correct connections.  
Table 1 lists the cable connections.  
3. Refer to Table 11 for the appropriate calibrator output and parameter  
values as you complete the following steps:  
a. On the calibrator, output the value listed in the Calibrator Output  
column in Table 11 for the current iteration.  
b. Call niDMM_CalAdjustGainwith Mode set to  
NIDMM_VAL_AC_VOLTS. Set the remaining parameters as shown  
in Table 11 for the current iteration.  
c. Call niDMM_CalAdjustGainagain, changing Mode to  
NIDMM_VAL_AC_VOLTS_DCCOUPLED.  
4. Repeat step 3 for each of the remaining iterations listed in Table 11.  
Table 11. niDMM_CalAdjustGain Parameters  
Calibrator Output  
f
niDMM_CalAdjustGain Parameters  
Range  
Expected  
Value  
Iteration  
Amplitude  
(kHz)  
Mode  
(V)  
0.05  
0.05  
0.5  
Input Resistance  
1
50 mV  
1
1
1
1
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
0.05  
0.05  
0.5  
50 mV  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
2
500 mV  
500 mV  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
0.5  
0.5  
NI 4070/4072 Calibration Procedure  
48  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
     
Table 11. niDMM_CalAdjustGain Parameters (Continued)  
Calibrator Output  
niDMM_CalAdjustGain Parameters  
f
Range  
Expected  
Value  
Iteration  
Amplitude  
5 V  
(kHz)  
Mode  
(V)  
5
Input Resistance  
3
1
1
1
1
1
1
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
5
5
5 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
4
5
50 V  
50  
50  
300  
300  
50  
50  
100  
100  
50 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
100 V  
100 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
5. Refer to Table 12 for the appropriate parameter values as you complete  
the following steps:  
a. Output 0 V on the calibrator.  
b. Call niDMM_CalAdjustOffsetwith Mode set to  
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown  
in Table 12 for the current iteration.  
c. Call niDMM_CalAdjustOffsetagain, changing Mode to  
NIDMM_VAL_AC_VOLTS_DCCOUPLED.  
6. Repeat step 5 for each of the remaining iterations shown in Table 12.  
Table 12. niDMM_CalAdjustOffset Parameters  
niDMM_CalAdjustOffset Parameters  
Iteration  
Mode  
Range (V)  
0.05  
0.05  
0.5  
0.5  
5
Input Resistance (Ω)  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
NIDMM_VAL_1_MEGAOHM  
1
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
2
3
4
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
50  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50  
300  
300  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
© National Instruments Corporation  
49  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
7. Refer to Table 13 for the appropriate calibrator outputs and parameter  
values as you complete the following steps:  
a. On the calibrator, output the value listed in the Calibrator Output  
column in Table 13 for the current iteration.  
b. Call niDMM_CalAdjustACFilterwith Mode set to  
NIDMM_VAL_AC_VOLTSand the remaining parameters as shown  
in Table 13 for the current iteration.  
Note The Session parameter remains the same for all instances of this function.  
c. Call niDMM_CalAdjustACFilteragain, changing Mode to  
NIDMM_VAL_AC_VOLTS_DCCOUPLED.  
8. Repeat step 7 for each of the remaining iterations shown in Table 13.  
Table 13. niDMM_CalAdjustACFilter Parameters  
Calibrator Output  
niDMM_CalAdjustACFilter Parameters  
Frequency  
Range  
(V)  
Frequency  
(Hz)  
Iteration  
Amplitude  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
500 mV  
500 mV  
(kHz)  
1
Mode  
1
NIDMM_VAL_AC_VOLTS  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.05  
0.5  
1e3  
1e3  
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
2
3
4
5
6
7
8
9
5
5e3  
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5e3  
20  
20e3  
20e3  
50e3  
50e3  
100e3  
100e3  
200e3  
200e3  
300e3  
300e3  
500e3  
500e3  
1e3  
20  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50  
50  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
100  
100  
200  
200  
300  
300  
500  
500  
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
0.5  
1e3  
NI 4070/4072 Calibration Procedure  
50  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
Table 13. niDMM_CalAdjustACFilter Parameters (Continued)  
Calibrator Output  
niDMM_CalAdjustACFilter Parameters  
Frequency  
(kHz)  
Range  
Frequency  
(Hz)  
Iteration  
Amplitude  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
5 V  
Mode  
(V)  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
5
10  
5
NIDMM_VAL_AC_VOLTS  
5e3  
5e3  
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
20  
20e3  
20e3  
50e3  
50e3  
100e3  
100e3  
200e3  
200e3  
300e3  
300e3  
500e3  
500e3  
1e3  
20  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50  
50  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
100  
100  
200  
200  
300  
300  
500  
500  
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5 V  
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
1e3  
5 V  
5
5
5e3  
5 V  
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
5e3  
5 V  
20  
5
20e3  
20e3  
50e3  
50e3  
100e3  
100e3  
200e3  
200e3  
300e3  
300e3  
5 V  
20  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
5 V  
50  
5
5 V  
50  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
5 V  
100  
100  
200  
200  
300  
300  
5
5 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
5 V  
5
5 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
5 V  
5
5 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
5
© National Instruments Corporation  
51  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 13. niDMM_CalAdjustACFilter Parameters (Continued)  
Calibrator Output  
niDMM_CalAdjustACFilter Parameters  
Frequency  
(kHz)  
Range  
Frequency  
(Hz)  
Iteration  
Amplitude  
5 V  
Mode  
(V)  
5
24  
500  
500  
1
NIDMM_VAL_AC_VOLTS  
500e3  
500e3  
1e3  
5 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
50 V  
50  
50 V  
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50  
1e3  
50 V  
5
50  
5e3  
50 V  
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50  
5e3  
50 V  
20  
20  
50  
50  
100  
100  
200  
200  
300  
300  
500  
500  
1
50  
20e3  
20e3  
50e3  
50e3  
100e3  
100e3  
200e3  
200e3  
300e3  
300e3  
500e3  
500e3  
1e3  
50 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50  
50 V  
50  
50 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50  
50 V  
50  
50 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50  
50 V  
50  
50 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50  
50 V  
50  
50 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50  
10 V  
50  
10 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
50  
100 V  
100 V  
100 V  
100 V  
100 V  
100 V  
100 V  
100 V  
100 V  
100 V  
300  
300  
300  
300  
300  
300  
300  
300  
300  
300  
1
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
1e3  
5
5e3  
5
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
5e3  
20  
20  
50  
50  
100  
100  
20e3  
20e3  
50e3  
50e3  
100e3  
100e3  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NI 4070/4072 Calibration Procedure  
52  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 13. niDMM_CalAdjustACFilter Parameters (Continued)  
Calibrator Output  
niDMM_CalAdjustACFilter Parameters  
Frequency  
(kHz)  
Range  
(V)  
Frequency  
(Hz)  
Iteration  
Amplitude  
100 V  
100 V  
50 V  
Mode  
38  
200  
200  
300  
300  
500  
500  
NIDMM_VAL_AC_VOLTS  
300  
300  
300  
300  
300  
300  
200e3  
200e3  
300e3  
300e3  
500e3  
500e3  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
39  
40  
50 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
NIDMM_VAL_AC_VOLTS  
10 V  
10 V  
NIDMM_VAL_AC_VOLTS_DCCOUPLED  
9. Reset the calibrator for safety reasons.  
10. Call niDMM_CalAdjustMiscwith Type set to  
NIDMM_EXTCAL_MISCCAL_SECTION.  
Select one of the following options:  
If you are performing additional adjustments, refer to the following  
sections, as applicable:  
Adjusting Current Modes  
Adjusting Capacitance and Inductance (NI 4072 Only)  
Caution For the NI 4072, adjusting the capacitance and inductance is required. Skipping  
this step causes an incorrect adjustment of the device.  
If you are not performing additional adjustments, refer to one of the  
following sections:  
Verification Procedures—to verify your new calibration  
coefficients before saving them to the EEPROM  
Completing the Adjustment Procedures—if you do not want to  
verify the adjustments you have just made  
If you do not use the current modes (DC and AC), or the accuracy is  
insignificant for your application, you can skip this section and select one  
of the following options:  
If you skip this section and you are calibrating an NI 4072, go to the  
Adjusting Capacitance and Inductance (NI 4072 Only) section.  
© National Instruments Corporation  
53  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
If you skip this section and you want to verify the new calibration  
coefficients before saving them to the EEPROM, repeat the  
Verification Procedures section (except for Initial Setup).  
If you skip this section and you do not want to verify the new  
calibration coefficients, go to the Completing the Adjustment  
Procedures section.  
To adjust the current modes of the NI 4070/4072, complete the following  
steps:  
1. Reset the calibrator.  
2. Fasten the connectors on one end of the Fluke 5440 cable to the  
NI 4070/4072 HI SENSE and LO banana plug connectors, and fasten  
the connectors on the other end of the cable to the HI and LO calibrator  
binding posts. Figure 3 shows the correct connections. Table 9 lists the  
cable connections.  
3. Call niDMM_ConfigureMeasurementwith the following  
parameters:  
Function = NIDMM_VAL_DC_CURRENT  
Range = 0.02  
4. Call niDMM_Readto configure the NI 4070/4072 for a current mode  
before applying current.  
5. Output 20 mA on the calibrator with the current output set to NORM.  
6. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_DC_CURRENT  
Range = 0.02  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = 0.02  
7. Output –20 mA on the calibrator with the current output set to NORM.  
8. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_DC_CURRENT  
Range = 0.02  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = –0.02  
9. Output 0 A on the calibrator.  
10. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_DC_CURRENT  
Range = 0.02  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
NI 4070/4072 Calibration Procedure  
54  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
11. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_AC_CURRENT  
Range = 0.01  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
12. Output 200 mA on the calibrator.  
13. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_DC_CURRENT  
Range = 0.2  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = 0.2  
14. Output –200 mA on the calibrator.  
15. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_DC_CURRENT  
Range = 0.2  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = –0.2  
16. Output 0 A on the calibrator.  
17. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_DC_CURRENT  
Range = 0.2  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
18. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_AC_CURRENT  
Range = 0.1  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
19. Output 1 A on the calibrator.  
20. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_DC_CURRENT  
Range = 1  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = 1  
21. Output –1 A on the calibrator.  
© National Instruments Corporation  
55  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
22. Call niDMM_CalAdjustGainwith the following parameters:  
Mode = NIDMM_VAL_DC_CURRENT  
Range = 1  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
Expected Value = –1  
23. Output 0 A on the calibrator with the current output set to NORM.  
24. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_DC_CURRENT  
Range = 1  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
25. Call niDMM_CalAdjustOffsetwith the following parameters:  
Mode = NIDMM_VAL_AC_CURRENT  
Range = 1  
Input Resistance = NIDMM_VAL_RESISTANCE_NA  
26. Call niDMM_CalAdjustMiscwith Type set to  
You have completed adjusting the current modes of the NI 4070/4072.  
Select one of the following options:  
If you are calibrating an NI 4070, refer to one of the following sections:  
Verification Procedures—to verify your new calibration coefficients  
before saving them to the EEPROM  
Completing the Adjustment Procedures—if you do not want to verify  
the adjustments you have just made  
If you are calibrating an NI 4072, refer to the Adjusting Capacitance and  
Inductance (NI 4072 Only) section.  
Adjusting Capacitance and Inductance  
(NI 4072 Only)  
If you are calibrating an NI 4070, skip this section and select one of the  
If you want to verify the new calibration coefficients before saving  
them to the EEPROM, repeat the Verification Procedures section  
(except for the Initial Setup section).  
If you do not want to verify the new calibration coefficients, go to the  
Completing the Adjustment Procedures section.  
NI 4070/4072 Calibration Procedure  
56  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
If you are calibrating an NI 4072, you must complete this section to attain  
a valid calibration.  
Caution It is necessary to adjust DC voltage and resistance before running these  
adjustment steps. During this procedure, be sure to keep hands and any other moving  
objects away from the fixture after calling every function.  
To adjust the capacitance and inductance of the NI 4072, complete the  
following steps:  
1. Disconnect any fixtures or cables from the NI 4072.  
2. Call niDMM_CalAdjustLCwith Type set to  
NIDMM_EXTCAL_LC_OPEN.  
3. Plug in the insulated banana plug shorting bar across the HI and LO  
banana plug connectors of the NI 4072.  
4. Call niDMM_CalAdjustLCwith Type set to  
NIDMM_EXTCAL_LC_SHORT.  
5. Remove the shorting bar and plug the 25 Ω resistor across the HI and  
LO banana plug connectors of the NI 4072. The leads between the  
resistor and the NI 4072 terminals should be 1 in.  
6. Wait 30 seconds for the thermal EMF to stabilize.  
7. Call niDMM_CalAdjustLCwith Type set to  
NIDMM_EXTCAL_LC_25OHM.  
8. Remove the resistor, and plug in across the HI and LO banana plug  
connectors of the NI 4072 the next adjustment resistor, according to  
Table 14.  
9. Repeat steps 6 through 8 using the parameters shown in Table 14 for  
niDMM_CalAdjustLC.  
Table 14. niDMM_CalAdjustLC Parameters  
niDMM_CalAdjustLC Parameters  
Value of Resistor  
125 Ω  
Type  
NIDMM_EXTCAL_LC_1KOHM  
NIDMM_EXTCAL_LC_5KOHM  
5 kΩ  
100 kΩ  
You have completed adjusting the capacitance and inductance modes of the  
NI 4072. Select one of the following options:  
To verify that the NI 4072 is now operating within its specifications,  
go to the Verification Procedures section and complete the appropriate  
procedures.  
© National Instruments Corporation  
57  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
     
To finish the calibration and close the session, go to the Completing the  
Adjustment Procedures section.  
Completing the Adjustment Procedures  
To complete the adjustment procedure for the NI 4070/4072 and close the  
session, call niDMM_CloseExtCalwith the following parameter:  
Action = NIDMM_EXTCAL_ACTION_SAVEif the results of the  
calibration were satisfactory and you want to save the new calibration  
coefficients to the EEPROM.  
Otherwise,  
Action = NIDMM_EXTCAL_ACTION_ABORTif the results of the  
calibration were unsatisfactory and you want to restore the original  
calibration coefficients to the EEPROM.  
This section includes the verification limits for DC voltage, AC voltage,  
4-wire resistance, 2-wire resistance, DC current, AC current, and frequency  
for the NI 4070/4072, and the verification tolerances for capacitance on the  
NI 4072. Compare these limits to the results you obtain in the Verification  
Procedures section.  
Note Use the values in the 24-Hour Limits column for a post-adjustment verification only.  
Otherwise, use the values in the 2-Year Limits column.  
Limits in the following tables are based upon the February 2007 edition of the  
NI 4070/4072 Specifications. Refer to the most recent NI 4070/4072 specifications online  
at ni.com/manuals. If a more recent edition of the specifications is available, recalculate  
the limits based upon the latest specifications.  
DC Voltage  
Table 15. NI 4070/4072 DC Voltage Verification Limits  
2-Year Limits  
24-Hour Limits  
Calibrator  
Amplitude  
Range  
1 V  
Input Resistance  
>10 GΩ/10 MΩ  
>10 GΩ/10 MΩ  
10 MΩ  
Lower  
–6 μV  
Upper  
6 μV  
Lower  
Upper  
2 μV  
0 V  
0 V  
–2 μV  
–20 μV  
10 V  
–60 μV  
60 μV  
20 μV  
0 V  
100 V  
300 V  
100 mV  
–600 μV  
–6 mV  
600 μV  
6 mV  
–200 μV  
–1.8 mV  
0.099998 V  
200 μV  
1.8 mV  
0.100002 V  
0 V  
10 MΩ  
100 mV  
>10 GΩ/10 MΩ  
0.099994 V  
0.100006 V  
NI 4070/4072 Calibration Procedure  
58  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
       
Table 15. NI 4070/4072 DC Voltage Verification Limits (Continued)  
2-Year Limits  
24-Hour Limits  
Calibrator  
Amplitude  
Range  
100 mV  
1 V  
Input Resistance  
>10 GΩ/10 MΩ  
>10 GΩ/10 MΩ  
>10 GΩ/10 MΩ  
>10 GΩ/10 MΩ  
>10 GΩ/10 MΩ  
10 MΩ  
Lower  
Upper  
Lower  
Upper  
–100 mV  
1 V  
–0.100006 V  
0.999969 V  
–1.000031 V  
9.99969 V  
–0.099994 V  
1.000031 V  
–0.999969 V  
10.00031 V  
–9.99969 V  
100.0041 V  
–99.9959 V  
300.0165 V  
–299.9835 V  
–0.100002 V  
0.999992 V  
–1.000008 V  
9.99994 V  
–0.099998 V  
1.000008 V  
–0.999992 V  
10.00006 V  
–9.99994 V  
100.0008 V  
–99.9992 V  
300.0036 V  
–299.9964 V  
–1 V  
1 V  
10 V  
10 V  
–10 V  
100 V  
–100 V  
300 V  
–300 V  
10 V  
–10.00031 V  
99.9959 V  
–10.00006 V  
99.9992 V  
100 V  
100 V  
300 V  
300 V  
10 MΩ  
–100.0041 V  
299.9835 V  
–300.0165 V  
–100.0008 V  
299.9964 V  
–300.0036 V  
10 MΩ  
10 MΩ  
AC Voltage  
Table 16. NI 4070/4072 AC Voltage Verification Limits  
Calibrator Output  
2-Year Limits  
Amplitude  
5 mV  
Frequency  
1 kHz  
Range  
50 mV  
50 mV  
50 mV  
50 mV  
500 mV  
50 mV  
50 mV  
50 mV  
50 mV  
500 mV  
500 mV  
500 mV  
5 V  
Coupling  
AC/DC  
DC  
Lower  
Upper  
0.0049775 V  
0.04993 V  
0.049955 V  
0.049955 V  
0.049875 V  
0.049955 V  
0.049935 V  
0.04971 V  
0.04845 V  
0.49945 V  
0.49965 V  
0.49965 V  
0.49875 V  
0.49965 V  
0.49945 V  
0.0050225 V  
0.05007 V  
0.050045 V  
0.050045 V  
0.050125 V  
0.050045 V  
0.050065 V  
0.05029 V  
0.05155 V  
0.50055 V  
0.50035 V  
0.50035 V  
0.50125 V  
0.50035 V  
0.50055 V  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
50 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
500 mV  
30 Hz  
50 Hz  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
DC  
1 kHz  
1 kHz  
20 kHz  
50 kHz  
100 kHz  
300 kHz  
30 Hz  
50 Hz  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
1 kHz  
1 kHz  
20 kHz  
50 kHz  
500 mV  
500 mV  
© National Instruments Corporation  
59  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
   
Table 16. NI 4070/4072 AC Voltage Verification Limits (Continued)  
Calibrator Output  
2-Year Limits  
Amplitude  
Frequency  
100 kHz  
300 kHz  
30 Hz  
Range  
500 mV  
500 mV  
5 V  
Coupling  
AC/DC  
AC/DC  
DC  
Lower  
0.4974 V  
0.48475 V  
4.9945 V  
4.9965 V  
4.9965 V  
4.9875 V  
4.9375 V  
4.9965 V  
4.9945 V  
4.974 V  
Upper  
500 mV  
500 mV  
5 V  
0.5026 V  
0.51525 V  
5.0055 V  
5.0035 V  
5.0035 V  
5.0125 V  
5.0625 V  
5.0035 V  
5.0055 V  
5.026 V  
5 V  
50 Hz  
5 V  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
DC  
5 V  
1 kHz  
5 V  
5 V  
1 kHz  
50 V  
300 V  
5 V  
5 V  
1 kHz  
5 V  
20 kHz  
50 kHz  
100 kHz  
300 kHz  
30 Hz  
5 V  
5 V  
5 V  
5 V  
5 V  
5 V  
4.8475 V  
49.945 V  
49.965 V  
49.965 V  
49.965 V  
49.945 V  
49.74 V  
5.1525 V  
50.055 V  
50.035 V  
50.035 V  
50.035 V  
50.055 V  
50.26 V  
50 V  
50 V  
50 V  
50 V  
50 V  
50 V  
50 V  
219 V  
219 V  
219 V  
219 V  
219 V  
219 V  
70 V  
50 V  
50 V  
50 V  
50 V  
50 V  
50 V  
50 V  
300 V  
300 V  
300 V  
300 V  
300 V  
300 V  
300 V  
50 Hz  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
DC  
1 kHz  
20 kHz  
50 kHz  
100 kHz  
300 kHz  
30 Hz  
48.475 V  
218.751 V  
218.8305 V  
218.8305 V  
218.8305 V  
218.7429 V  
217.845 V  
67.75 V  
51.525 V  
219.249 V  
219.1695 V  
219.1695 V  
219.1695 V  
219.2571 V  
220.155 V  
72.25 V  
50 Hz  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
AC/DC  
1 kHz  
20 kHz  
50 kHz  
100 kHz  
300 kHz  
NI 4070/4072 Calibration Procedure  
60  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
4-Wire Resistance  
Note Tolerances are provided for 4-wire resistance instead of absolute limits because the  
limits depend on the actual resistance value output by your calibrator.  
Table 17. NI 4070/4072 4-Wire Resistance Verification Tolerances  
Calibrator  
2-Year Tolerance  
(ppm of Range)  
24-Hour Tolerance  
Resistance  
10 MΩ  
1 MΩ  
100 kΩ  
10 kΩ  
1 kΩ  
Range  
10 MΩ  
1 MΩ  
100 kΩ  
10 kΩ  
1 kΩ  
(ppm of Range)  
102 ppm  
22 ppm  
17 ppm  
14 ppm  
14 ppm  
25 ppm  
2 ppm  
410 ppm  
100 ppm  
86 ppm  
83 ppm  
83 ppm  
90 ppm  
10 ppm  
10 ppm  
6 ppm  
100 Ω  
0 Ω  
100 Ω  
10 MΩ  
1 MΩ  
100 kΩ  
10 kΩ  
1 kΩ  
0 Ω  
2 ppm  
0 Ω  
2 ppm  
0 Ω  
3 ppm  
2 ppm  
0 Ω  
3 ppm  
2 ppm  
0 Ω  
100 Ω  
10 ppm  
10 ppm  
2-Wire Resistance  
Note Tolerances are provided for 2-wire resistance instead of absolute limits because the  
limits depend on the actual resistance value output by your calibrator.  
Table 18. NI 4070/4072 2-Wire Resistance Verification Tolerances  
Calibrator  
Resistance  
2-Year Tolerance  
(ppm of Range)  
24-Hour Tolerance  
(ppm of Range)  
Range  
10 kΩ  
1 kΩ  
0 Ω  
0 Ω  
40 ppm  
400 ppm  
4000 ppm  
6040 ppm  
410 ppm  
100 ppm  
20 ppm  
200 ppm  
2000 ppm  
920 ppm  
102 ppm  
22 ppm  
0 Ω  
100 Ω  
100 MΩ  
10 MΩ  
1 MΩ  
100 MΩ  
10 MΩ  
1 MΩ  
© National Instruments Corporation  
61  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
       
Table 18. NI 4070/4072 2-Wire Resistance Verification Tolerances (Continued)  
Calibrator  
Resistance  
2-Year Tolerance  
(ppm of Range)  
24-Hour Tolerance  
(ppm of Range)  
Range  
100 kΩ  
10 kΩ  
1 kΩ  
100 kΩ  
10 kΩ  
1 kΩ  
86 ppm  
83 ppm  
83 ppm  
90 ppm  
17 ppm  
14 ppm  
14 ppm  
100 Ω  
100 Ω  
25 ppm  
DC Current  
Table 19. NI 4070/4072 DC Current Verification Limits  
2-Year Limits  
Calibrator Amplitude  
Range  
20 mA  
200 mA  
1 A  
Lower  
–1.5 μA  
Upper  
1.5 μA  
0 A  
0 A  
–4 μA  
4 μA  
0 A  
–20 μA  
20 μA  
20 mA  
–20 mA  
200 mA  
–200 mA  
1 A  
20 mA  
20 mA  
200 mA  
200 mA  
1 A  
19.989 mA  
–20.011 mA  
199.916 mA  
–200.084 mA  
0.99945 A  
–1.00055 A  
20.011 mA  
–19.989 mA  
200.084 mA  
–199.916 mA  
1.00055 A  
–0.99945 A  
–1 A  
1 A  
AC Current  
Table 20. NI 4070/4072 AC Current Verification Limits  
Calibrator Output  
2-Year Limits  
Amplitude  
Frequency  
1 kHz  
Range  
10 mA  
10 mA  
100 mA  
100 mA  
1 A  
Lower  
0.9976 mA  
9.994 mA  
9.976 mA  
99.94 mA  
99.7 mA  
Upper  
1 mA  
10 mA  
10 mA  
100 mA  
100 mA  
1 A  
1.0024 mA  
10.006 mA  
10.024 mA  
100.06 mA  
100.3 mA  
1.0012 A  
1 kHz  
1 kHz  
1 kHz  
1 kHz  
1 kHz  
1 A  
0.9988 A  
NI 4070/4072 Calibration Procedure  
62  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
       
Frequency  
Table 21. Frequency Limits  
2-Year Limits  
NI 6608 Output Frequency  
Lower  
Upper  
1 Hz  
0.9999 Hz  
19.998 kHz  
499.95 kHz  
1.0001 Hz  
20.002 kHz  
500.05 kHz  
20 kHz  
500 kHz  
Capacitance and Inductance  
Note Because the actual capacitance verification values can differ from the following  
values, Table 22 provides tolerances that correspond to the NI 4072 accuracy  
specifications  
Table 22. NI 4072 Capacitance and Inductance Verification Tolerances  
2-Year Tolerances  
Verification Values  
0 pF  
Range  
300 pF  
10 uH  
% of Reading  
% of Range  
0
0.5  
1
0 uH  
0
270 pF  
1 nF  
300 pF  
1 nF  
0.15  
0.15  
0.15  
0.15  
0.18  
0.18  
0.18  
0.18  
0.18  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
1 nF  
10 nF  
100 nF  
100 nF  
10 uF  
100 nF  
1 uF  
10 uF  
10 uF  
100 uF  
1,000 uF  
10,000 uF  
1,000 uF  
1,000 uF  
© National Instruments Corporation  
63  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
       
Appendix A: Calibration Options  
The complete calibration process for the NI 4070/4072 consists of  
verifying, adjusting, and reverifying a device. During verification, you  
compare the measured performance to an external standard of known  
measurement uncertainty to confirm that the product meets or exceeds  
specifications. Figure 4 shows the procedural flow for verification.  
During adjustment, you correct the measurement error of the device by  
adjusting the calibration constants and storing the new calibration constants  
in the EEPROM. Frequency is the only mode that does not require  
adjustment. Figure 5 shows the procedural flow for adjustment.  
Reverifying all modes after adjustments ensures that the adjustment  
procedures were performed correctly.  
Normally, the calibration sequence is as follows:  
1. Verify the operation of the NI 4070/4072 using the 2-year accuracy  
limits (or the 90-day accuracy limits if it has been externally calibrated  
within that time).  
2. Adjust the NI 4070/4072.  
3. Reverify the NI 4070/4072 using the 24-hour accuracy limits (or the  
2-year accuracy limits when the 24-hour limits are not specified).  
Depending on your measurement and accuracy requirements, a complete  
calibration of the NI 4070/4072 may not be necessary. A number of options  
are available that can shorten the calibration time. The following  
adjustment options are available:  
Complete calibration—Performing the entire calibration procedure  
from beginning to end; guarantees that the NI 4070/4072 performs at  
or above the published specifications for all modes and ranges  
Complete calibration with exceptions:  
Omitting AC voltage mode steps if you do not use the AC voltage  
modes or if the AC voltage accuracy is irrelevant  
Omitting DC/AC current mode steps if you do not use the current  
modes or if the DC/AC current accuracy is irrelevant  
Omitting both AC voltage and DC/AC current mode steps if you  
do not use those modes or if the accuracy of those measurements  
is irrelevant  
NI 4070/4072 Calibration Procedure  
64  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
Table 23. Summary of Adjustment Options  
Adjustment  
Optional  
Required  
DC Voltage  
Resistance  
Y
Y
Y
AC Voltage  
AC/DC Current  
Y
Y
Inductance and Capacitance  
(NI 4072 only)  
© National Instruments Corporation  
65  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Verify  
DC Voltage  
Mode?  
Go to  
Initial Setup  
Yes  
Yes  
Yes  
Go to Verifying  
DC Voltage  
No  
Verify  
AC Voltage  
Mode?  
Go to Verifying  
AC Voltage  
No  
Verify  
4-Wire Resistance  
Mode?  
Go to Verifying  
4-Wire Resistance  
No  
Verify  
2-Wire Resistance  
Mode?  
Yes  
Yes  
Yes  
Go to Verifying  
2-Wire Resistance  
No  
Verify  
DC Current  
Mode?  
Go to Verifying  
DC Current  
No  
Verify  
AC Current  
Mode?  
Go to Verifying  
AC Current  
No  
Verify  
Frequency  
Mode?  
Go to Verifying  
Frequency  
Yes  
No  
Go to Verifying  
Capacitance  
and Inductance  
Verify Capacitance  
and Inductance  
(NI 4072 Only)?  
Yes  
No  
Is this a  
Go to Adjustment  
Procedures  
Flowchart  
Go to Completing  
the Adjustment  
Procedures  
Pre-Adjustment  
Post-Adjustment  
Pre-Adjustment or  
Post-Adjustment  
Verification?  
Figure 4. Verification Procedures Flowchart  
NI 4070/4072 Calibration Procedure  
66  
ni.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
Verification  
Go to Adjusting  
DC Voltage and  
Resistance  
Adjust  
AC Voltage  
Modes?  
No  
Yes  
Go to Adjusting  
AC Voltage Modes  
Adjust  
Current  
Modes?  
No  
Yes  
Go to Adjusting  
Current Modes  
Go to Adjusting  
Capacitance and  
Inductance  
Perform  
Post-Adjustment  
Verification?  
Go to  
Verification  
Procedures Flowchart  
Yes  
No  
Go to Completing  
the Adjustment  
Procedures  
Figure 5. Adjustment Procedures Flowchart  
© National Instruments Corporation  
67  
NI 4070/4072 Calibration Procedure  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
Where to Go for Support  
The National Instruments Web site is your complete resource for technical  
support. At ni.com/supportyou have access to everything from  
troubleshooting and application development self-help resources to email  
and phone assistance from NI Application Engineers.  
A Declaration of Conformity (DoC) is our claim of compliance with the  
Council of the European Communities using the manufacturer’s  
declaration of conformity. This system affords the user protection for  
electronic compatibility (EMC) and product safety. You can obtain the DoC  
for your product by visiting ni.com/certification. If your product  
supports calibration, you can obtain the calibration certificate for your  
product at ni.com/calibration.  
National Instruments corporate headquarters is located at  
11500 North Mopac Expressway, Austin, Texas, 78759-3504.  
National Instruments also has offices located around the world to help  
address your support needs. For telephone support in the United States,  
create your service request at ni.com/supportand follow the calling  
instructions or dial 512 795 8248. For telephone support outside the United  
States, contact your local branch office:  
Australia 1800 300 800, Austria 43 662 457990-0,  
Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,  
Canada 800 433 3488, China 86 21 5050 9800,  
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,  
Finland 385 (0) 9 725 72511, France 33 (0) 1 48 14 24 24,  
Germany 49 89 7413130, India 91 80 41190000, Israel 972 3 6393737,  
Italy 39 02 413091, Japan 81 3 5472 2970, Korea 82 02 3451 3400,  
Lebanon 961 (0) 1 33 28 28, Malaysia 1800 887710,  
Mexico 01 800 010 0793, Netherlands 31 (0) 348 433 466,  
New Zealand 0800 553 322, Norway 47 (0) 66 90 76 60,  
Poland 48 22 3390150,Portugal 351 210 311 210,Russia 7 495 783 6851,  
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,  
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,  
Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,  
Taiwan 886 02 2377 2222, Thailand 662 278 6777,  
Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545  
National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation.  
Refer to the Terms of Use section on ni.com/legalfor more information about National  
Instruments trademarks. Other product and company names mentioned herein are trademarks or trade  
names of their respective companies. For patents covering National Instruments products, refer to the  
appropriate location: Help»Patents in your software, the patents.txtfile on your CD, or  
ni.com/patents.  
© 2003–2007 National Instruments Corporation. All rights reserved.  
370532F-01  
Apr07  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 

MTD Chipper 243 645C000 User Manual
NEC Computer Monitor E1100+ User Manual
Nortel Networks Network Router 705 User Manual
Northern Industrial Tools Saw BLACK NICKEL 3 AIR CUTOFF TOOL User Manual
NuTone Door LA 205WH User Manual
NuTone Ventilation Hood RL6100 H User Manual
Olympus Microcassette Recorder VN 180 User Manual
Panasonic Cell Phone EB SA7 User Manual
Panasonic Cordless Telephone KX TG2570B User Manual
Panasonic DVR DMR E65 User Manual