National Instruments PXI-4070 6 1/2 Digit FlexDMM Calibration Procedure
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National Instruments PXI-4070 6 1/2 Digit FlexDMM Calibration Procedure

National Instruments PXI-4070 6 1/2 Digit FlexDMM Calibration Procedure

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NI PXI-4070 6½ Digit FlexDMM
Calibration Procedure
Contents
CVI™, FlexDMM™, LabVIEW™, National Instruments™, NI™, ni.com™, and NI-DMM™ are trademarks of
National Instruments Corporation. 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.txt file on your CD, or ni.com/patents.
ni.com
© 2003 National Instruments Corp. All rights reserved.
This document contains step-by-step instructions for writing an external
calibration procedure for the NI PXI-4070 6½ digit FlexDMM and
1.8 MS/s isolated digitizer (NI 4070).
Conventions ............................................................................................ 2
Calibration Overview.............................................................................. 2
What Is Calibration? ........................................................................ 3
Why Should You Calibrate? ............................................................ 3
How Often Should You Calibrate? .................................................. 3
What Calibration Options Are Available?....................................... 4
How Much Time Does Calibration Require? .................................. 4
Equipment and Other Test Requirements ............................................... 4
Required Test Equipment ................................................................ 4
Optional Test Equipment ................................................................. 5
Test Conditions ................................................................................ 5
Documentation................................................................................. 6
Software ........................................................................................... 6
Verification Procedures........................................................................... 9
Setting Up the Test Equipment ........................................................ 9
Verifying DC Voltage...................................................................... 10
Verifying AC Voltage...................................................................... 18
Verifying 4-Wire Resistance ........................................................... 26
Verifying 2-Wire Resistance ........................................................... 28
Verifying DC Current ...................................................................... 33
Verifying AC Current ...................................................................... 35
Verifying Frequency ........................................................................ 36
Adjustment Procedures ........................................................................... 38
Setting Up the Test Equipment ........................................................ 39
Adjusting DC Voltage and Resistance............................................. 39
™
February 2003
370532A-01

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Summary of Contents for National Instruments PXI-4070 6 1/2 Digit FlexDMM

  • Page 1: Table Of Contents

    February 2003 CVI™, FlexDMM™, LabVIEW™, National Instruments™, NI™, ni.com™, and NI-DMM™ are trademarks of National Instruments Corporation. Product and company names mentioned herein are trademarks or trade names of 370532A-01 their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents.

  • Page 2: Conventions

    Adjusting Current Modes ..............52 Completing the Adjustment Procedures...........55 Verification Limits ..................56 DC Voltage..................56 AC Voltage..................56 4-Wire Resistance................58 2-Wire Resistance................59 DC Current ..................59 AC Current ..................60 Frequency ..................60 Calibration Function Reference...............61 Technical Support Resources ..............61 NI Web Support................61 Worldwide Support ................61 Conventions The following conventions are used in this manual: »...

  • Page 3: Calibration Overview

    Frequency is the only mode that does not require adjustment. Reverifying all modes after adjustments ensures that the adjustment procedures were performed correctly. National Instruments can perform stringent in-house calibration of the NI 4070 and can generate either a basic or a detailed calibration certificate for you. Visit for more information on calibration ni.com/calibration...

  • Page 4: How Often Should You Calibrate

    50 minutes. If you choose to run the calibration in manual mode, the process requires more time and is more prone to operator error. NI recommends using an automated procedure, such as the procedures available with National Instruments Calibration Executive software. For more information on calibration, visit ni.com/calibration NI PXI-4070 Calibration Procedure ni.com...

  • Page 5: Equipment And Other Test Requirements

    Pomona B-4 cables instead of this wire) • National Instruments PXI chassis and controller • National Instruments calibration cable assembly for the NI 4070 (part number 161283A-01) Optional Test Equipment The following equipment is optional for calibrating the NI 4070 and is only used for frequency verification: •...

  • Page 6: Documentation

    • Specifications for the NI PXI-4070 All of these documents are installed on your computer when you install NI-DMM. To locate them, go to Start»Programs»National Instruments» NI-DMM»Documentation. If you are performing the optional frequency verification procedure, you may need the following documents, which are available at ni.com/...
  • Page 7 You also can program in LabVIEW using the VIs that correspond to the C function calls. Figure 1 shows the procedural flow for verification. Figure 2 shows the procedural flow for adjustment. © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 8 Setting up Verify Go to Verifying the Test DC Voltage DC Voltage Equipment Modes? Verify Go to Verifying AC Voltage AC Voltage Modes? Verify Go to Verifying 4-Wire Resistance 4-Wire Resistance Modes? Verify Go to Verifying 2-Wire Resistance 2-Wire Resistance Modes? Verify Go to Verifying...
  • Page 9 Modes? Go to Adjusting AC Voltage Modes Adjust Current Modes? Go to Adjusting Current Modes Perform Go to Post-Adjustment Verification Verification? Procedures Flowchart Completing the Adjustment Procedures Figure 2. Adjustment Procedures Flowchart © National Instruments Corporation NI PXI-4070 Calibration Procedure...

  • Page 10: Verification Procedures

    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.

  • Page 11: Verifying Dc Voltage

    Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 11. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_DC_VOLTS • Range = • Resolution = 1e–6 © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 12 10. Set the input resistance of the NI 4070 to >10 GΩ by calling with the following parameters: niDMM_SetAttributeViReal64 • Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM 11. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 11. 12.
  • Page 13 Table 1 lists the assignments of the spade lugs to the corresponding calibrator binding posts. 1 SHD 4 2wr COMP+ 7 HS 2 HI 5 SHD 8 LS 3 LO 6 2wr COMP– 9 SHD Figure 3. NI Calibration Cable Assembly © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 14 Table 1. Spade Lug to Calibrator Binding Post Assignments Calibration Cable Assembly Spade Lugs Calibrator Binding Posts V GUARD OUTPUT HI OUTPUT LO 2wr COMP+ OUTPUT HI V GUARD 2wr COMP– OUTPUT LO SENSE HI SENSE LO V GUARD 23. Wait two minutes for the thermal EMF to stabilize. 24.
  • Page 15 Attribute_Value = NIDMM_VAL_10_MEGAOHM 37. Call . Subtract the previously stored 100 mV >10 MΩ niDMM_Read mode offset from this measurement and verify that the result falls between the limits listed in Table 11. © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 16 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. 39. Set the input resistance of the NI 4070 to >10 GΩ by calling with the following parameters: niDMM_SetAttributeViReal64 •...
  • Page 17 61. Set the input resistance of the NI 4070 to >10 GΩ by calling with the following parameters: niDMM_SetAttributeViReal64 • Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM 62. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 11. © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 18 63. Set the input resistance of the NI 4070 to 10 MΩ by calling with the following parameters: niDMM_SetAttributeViReal64 • Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_10_MEGAOHM 64. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 11. 65.

  • Page 19: Verifying Ac Voltage

    • Range = 0.05 • Resolution = 50e–9 Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 12. Output 50 mV at 30 Hz on the calibrator. © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 20 10. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED • Range = 0.05 • Resolution = 50e–9 11. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 12. 12. Refer to Table 2 for the appropriate calibrator outputs and parameter values as you complete the following steps: On the calibrator, output the value listed under Calibrator Output in Table 2 for the current iteration.
  • Page 21 . Verify that this measurement falls between the niDMM_Read limits listed in Table 12. Call again, changing Mode to niDMM_ConfigureMeasurement NIDMM_VAL_AC_VOLTS_DCCOUPLED Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 12. © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 22 Table 3. niDMM_ConfigureMeasurement Parameters Calibrator Output niDMM_ConfigureMeasurement Parameters Iteration Amplitude Frequency Function Range Resolution 500 mV 50 Hz NIDMM_VAL_AC_VOLTS 500e–9 500 mV 50 Hz NIDMM_VAL_AC_VOLTS 500e–9 _DCCOUPLED 500 mV 1 kHz NIDMM_VAL_AC_VOLTS 500e–9 500 mV 1 kHz NIDMM_VAL_AC_VOLTS 500e–9 _DCCOUPLED 500 mV 1 kHz NIDMM_VAL_AC_VOLTS...
  • Page 23 1 kHz NIDMM_VAL_AC_VOLTS 50e–6 _DCCOUPLED 1 kHz NIDMM_VAL_AC_VOLTS 300. 300e–6 1 kHz NIDMM_VAL_AC_VOLTS 300e–6 _DCCOUPLED 20 kHz NIDMM_VAL_AC_VOLTS 5e–6 20 kHz NIDMM_VAL_AC_VOLTS 5e–6 _DCCOUPLED 50 kHz NIDMM_VAL_AC_VOLTS 5e–6 50 kHz NIDMM_VAL_AC_VOLTS 5e–6 _DCCOUPLED © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 24 Table 4. niDMM_ConfigureMeasurement Parameters (Continued) Calibrator Output niDMM_ConfigureMeasurement Parameters Iteration Amplitude Frequency Function Range Resolution 100 kHz NIDMM_VAL_AC_VOLTS 5e–6 100 kHz NIDMM_VAL_AC_VOLTS 5e–6 _DCCOUPLED 300 kHz NIDMM_VAL_AC_VOLTS 5e–6 300 kHz NIDMM_VAL_AC_VOLTS 5e–6 _DCCOUPLED 22. Output 50 V at 30 Hz on the calibrator. 23.
  • Page 25 28. Output 219 V at 30 Hz on the calibrator. 29. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED • Range = • Resolution = 300e–6 © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 26 30. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 12. 31. Refer to Table 6 for the appropriate calibrator outputs and parameter values as you complete the following steps: On the calibrator, output the value listed under Calibrator Output in Table 6 for the current iteration.

  • Page 27: Verifying 4-Wire Resistance

    Table 1. Wait two minutes for the thermal EMF to stabilize if the calibration cable assembly was not previously connected in this configuration. Call niDMM_reset Call with OffsetCompOhms niDMM_ConfigureOffsetCompOhms set to NIDMM_VAL_OFFSET_COMP_OHMS_ON © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 28 Refer to Table 7 for the appropriate calibrator output and function parameter values as you complete the following steps: On the calibrator, output the value listed in the Calibrator Output column in Table 7 for the current iteration. Make sure that the external sense is turned on, but 2-wire compensation is turned off.

  • Page 29: Verifying 2-Wire Resistance

    100 MΩ range offset. niDMM_Read Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_2_WIRE_RES • Range = 10e6 • Resolution = Call and store the result as the 10 MΩ range offset. niDMM_Read © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 30 10. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_2_WIRE_RES • Range = • Resolution = 11. Call and store the result as the 1 MΩ range offset. niDMM_Read 12. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_2_WIRE_RES •...
  • Page 31 Store the result as the 100 Ω range offset. 24. Output 100 MΩ on the calibrator with no external sense or 2-wire compensation. © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 32 25. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_2_WIRE_RES • Range = 100e6 • Resolution = 26. Call . Subtract the previously stored 100 MΩ range offset niDMM_Read from this measurement. Verify that the result falls between the tolerances listed in Table 14.
  • Page 33 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. © National Instruments Corporation NI PXI-4070 Calibration Procedure...

  • Page 34: Verifying Dc Current

    • If you do not want to verify any additional modes and you are performing a pre-adjustment verification, call to close niDMM_close the session. Verifying DC Current To verify the DC current of the NI 4070, complete the following steps: Reset the calibrator.
  • Page 35 Table 15. 25. Output –1 A on the calibrator with the current output set to 26. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 15. © National Instruments Corporation NI PXI-4070 Calibration Procedure...

  • Page 36: Verifying Ac Current

    You have completed verifying the DC current of the NI 4070. Select one of the following options: • 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...

  • Page 37: Call Nidmm_Configuremeasurement With The Following Parameters

    Completing the Adjustment Procedures section. • If you do not want to verify any additional modes and you are performing a pre-adjustment verification, call to close niDMM_close the session. © National Instruments Corporation NI PXI-4070 Calibration Procedure...

  • Page 38: Verifying Frequency

    Verifying Frequency Note The frequency of the NI 4070 is not user adjustable. If this verification procedure indicates that the frequency is out of specification, return the NI 4070 to NI for repair. To verify the frequency of the NI 4070, complete the following steps: Remove the calibration cable assembly from the NI 4070.

  • Page 39: Adjustment Procedures

    This section explains how to adjust the NI 4070. 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. © National Instruments Corporation NI PXI-4070 Calibration Procedure...

  • Page 40: Setting Up The Test Equipment

    For example, if Range = , the floating point value is . Refer to the NI Digital Multimeters Help for more information. 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.
  • Page 41 Expected Measurement = 11. Output –10 V on the calibrator. 12. Call with the following parameters: niDMM_CalAdjustGain • Mode = NIDMM_VAL_DC_VOLTS • Range = • Input Resistance = NIDMM_VAL_GREATER_THAN_10_GIGAOHM • Expected Measurement = –10 © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 42 13. Remove the connector block from the NI 4070, leaving the spade lugs connected to the calibrator. Plug in the insulated banana plug shorting bar across the HI and LO banana plug connectors of the NI 4070. 14. Wait two minutes for the thermal EMF to stabilize. 15.
  • Page 43 NIDMM_VAL_RESISTANCE_NA 37. Output 100 kΩ on the calibrator with external sense turned on, but without 2-wire compensation. 38. Call with the following parameters: niDMM_CalAdjustGain • Mode = NIDMM_VAL_4_WIRE_RES • Range = 100e3 © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 44 • Input Resistance = NIDMM_VAL_RESISTANCE_NA Ω • Expected Value = the display on the calibrator for 100 k 39. Output 10 kΩ on the calibrator with external sense turned on, but without 2-wire compensation. 40. Call with the following parameters: niDMM_CalAdjustGain •...
  • Page 45 • Mode = NIDMM_VAL_2_WIRE_RES • Range = • Input Resistance = NIDMM_VAL_RESISTANCE_NA 57. Call with the following parameters: niDMM_CalAdjustOffset • Mode = NIDMM_VAL_2_WIRE_RES • Range = 100e3 • Input Resistance = NIDMM_VAL_RESISTANCE_NA © National Instruments Corporation NI PXI-4070 Calibration Procedure...

  • Page 46: Adjusting Ac Voltage (Ac- And Dc-Coupled) Modes

    58. Call with the following parameters: niDMM_CalAdjustOffset • Mode = NIDMM_VAL_2_WIRE_RES • Range = 10e3 • Input Resistance = NIDMM_VAL_RESISTANCE_NA 59. Call with the following parameters: niDMM_CalAdjustOffset • Mode = NIDMM_VAL_2_WIRE_RES • Range = • Input Resistance = NIDMM_VAL_RESISTANCE_NA 60. Call with the following parameters: niDMM_CalAdjustOffset •...
  • Page 47 _DCCOUPLED 1_MEGAOHM 50 V 1 kHz NIDMM_VAL_AC_VOLTS NIDMM_VAL_ 1_MEGAOHM 50 V 1 kHz NIDMM_VAL_AC_VOLTS NIDMM_VAL_ _DCCOUPLED 1_MEGAOHM 100 V 1 kHz NIDMM_VAL_AC_VOLTS NIDMM_VAL_ 1_MEGAOHM 100 V 1 kHz NIDMM_VAL_AC_VOLTS NIDMM_VAL_ _DCCOUPLED 1_MEGAOHM © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 48 Refer to Table 9 for the appropriate parameter values as you complete the following steps: Output 0 V on the calibrator. Call with Mode set to niDMM_CalAdjustOffset and the remaining parameters as shown NIDMM_VAL_AC_VOLTS in Table 9 for the current iteration. Call again, changing Mode to niDMM_CalAdjustOffset...

  • Page 49: Range

    50 mV NIDMM_VAL_AC_VOLTS 0.05 200e3 50 mV NIDMM_VAL_AC_VOLTS_ 0.05 200e3 DCCOUPLED 50 mV NIDMM_VAL_AC_VOLTS 0.05 300e3 50 mV NIDMM_VAL_AC_VOLTS_ 0.05 300e3 DCCOUPLED 50 mV NIDMM_VAL_AC_VOLTS 0.05 500e3 50 mV NIDMM_VAL_AC_VOLTS_ 0.05 500e3 DCCOUPLED © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 50 Table 10. niDMM_CalAdjustACFilter Parameters (Continued) Calibrator Output niDMM_CalAdjustACFilter Parameters Frequency Range Frequency Iteration Amplitude (kHz) Mode (Hz) 500 mV NIDMM_VAL_AC_VOLTS 500 mV NIDMM_VAL_AC_VOLTS_ DCCOUPLED 500 mV NIDMM_VAL_AC_VOLTS 500 mV NIDMM_VAL_AC_VOLTS_ DCCOUPLED 500 mV NIDMM_VAL_AC_VOLTS 20e3 500 mV NIDMM_VAL_AC_VOLTS_ 20e3 DCCOUPLED 500 mV NIDMM_VAL_AC_VOLTS 50e3...
  • Page 51 NIDMM_VAL_AC_VOLTS_ 100e3 DCCOUPLED NIDMM_VAL_AC_VOLTS 200e3 NIDMM_VAL_AC_VOLTS_ 200e3 DCCOUPLED NIDMM_VAL_AC_VOLTS 300e3 NIDMM_VAL_AC_VOLTS_ 300e3 DCCOUPLED NIDMM_VAL_AC_VOLTS 500e3 NIDMM_VAL_AC_VOLTS_ 500e3 DCCOUPLED 50 V NIDMM_VAL_AC_VOLTS 50 V NIDMM_VAL_AC_VOLTS_ DCCOUPLED 50 V NIDMM_VAL_AC_VOLTS 50 V NIDMM_VAL_AC_VOLTS_ DCCOUPLED © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 52 Table 10. niDMM_CalAdjustACFilter Parameters (Continued) Calibrator Output niDMM_CalAdjustACFilter Parameters Frequency Range Frequency Iteration Amplitude (kHz) Mode (Hz) 50 V NIDMM_VAL_AC_VOLTS 20e3 50 V NIDMM_VAL_AC_VOLTS_ 20e3 DCCOUPLED 50 V NIDMM_VAL_AC_VOLTS 50e3 50 V NIDMM_VAL_AC_VOLTS_ 50e3 DCCOUPLED 50 V NIDMM_VAL_AC_VOLTS 100e3 50 V NIDMM_VAL_AC_VOLTS_ 100e3 DCCOUPLED...
  • Page 53 EEPROM. • If you do not want to verify the adjustments you have just made, go to Completing the Adjustment Procedures section. © National Instruments Corporation NI PXI-4070 Calibration Procedure...

  • Page 54: Adjusting Current Modes

    Adjusting Current Modes 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 want to verify the new calibration coefficients before saving them to the EEPROM, repeat the Verification Procedures section (except for...
  • Page 55 19. Call with the following parameters: niDMM_CalAdjustOffset • Mode = NIDMM_VAL_AC_CURRENT • Range = • Input Resistance = NIDMM_VAL_RESISTANCE_NA 20. Output 1 A on the calibrator with the current output set to © National Instruments Corporation NI PXI-4070 Calibration Procedure...
  • Page 56 21. Call with the following parameters: niDMM_CalAdjustGain • Mode = NIDMM_VAL_DC_CURRENT • Range = • Input Resistance = NIDMM_VAL_RESISTANCE_NA • Expected Value = 22. Output –1 A on the calibrator with the current output set to 23. Call with the following parameters: niDMM_CalAdjustGain •...

  • Page 57: Completing The Adjustment Procedures

    –100.0008 V –99.9992 V 300 V 300 V 10 MΩ 299.9835 V 300.0165 V 299.9964 V 300.0036 V –300 V 300 V 10 MΩ –300.0165 V –299.9835 V –300.0036 V –299.9964 V © National Instruments Corporation NI PXI-4070 Calibration Procedure...

  • Page 58: Ac Voltage

    AC Voltage Table 12. NI 4070 AC Voltage Verification Limits Calibrator Output 2-Year Limits Amplitude Frequency Range Coupling Lower Upper 5 mV 1 kHz 50 mV AC/DC 0.0049775 V 0.0050225 V 50 mV 30 Hz 50 mV 0.04993 V 0.05007 V 50 mV 50 Hz 50 mV...

  • Page 59: 4-Wire Resistance

    10 MΩ 10 MΩ ±410 ppm ±102 ppm 1 MΩ 1 MΩ ±100 ppm ±22 ppm 100 kΩ 100 kΩ ±86 ppm ±14 ppm 10 kΩ 10 kΩ ±83 ppm ±14 ppm © National Instruments Corporation NI PXI-4070 Calibration Procedure...

  • Page 60: 2-Wire Resistance

    Table 13. NI 4070 4-Wire Resistance Verification Tolerances (Continued) Calibrator 2-Year Tolerance 24-Hour Tolerance Resistance Range (ppm of Range) (ppm of Range) 1 kΩ 1 kΩ ±83 ppm ±14 ppm 100 Ω 100 Ω ±90 ppm ±25 ppm 0 Ω 10 MΩ...

  • Page 61: Dc Current

    1 kHz 100 mA 9.976 mA 10.024 mA 100 mA 1 kHz 100 mA 99.94 mA 100.06 mA 100 mA 1 kHz 99.7 mA 100.3 mA 1 kHz 0.9988 A 1.0012 A © National Instruments Corporation NI PXI-4070 Calibration Procedure...

  • Page 62: Calibration Function Reference

    Programs»National Instruments»NI-DMM»Documentation. Technical Support Resources NI Web Support National Instruments Web support is your first stop for help in solving installation, configuration, and application problems and questions. Online problem-solving and diagnostic resources include frequently asked questions, knowledge bases, product-specific troubleshooting wizards, manuals, drivers, software updates, and more.
  • Page 63 If you have searched the technical support resources on our Web site and still cannot find the answers you need, contact your local office or National Instruments corporate. For telephone support in the United States, dial 512 795 8248. For telephone support outside the United States, contact...

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