National Instruments PXI-4070 6 1/2 Digit FlexDMM User Manual Download

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February 2003

370532A-01

NI PXI-4070 6½ Digit FlexDMM
Calibration Procedure

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).

Contents

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
Adjusting AC Voltage (AC- and DC-Coupled) Modes................... 45

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

Page 1: ...he NI PXI 4070 6 digit FlexDMM and 1 8 MS s isolated digitizer NI 4070 Contents Conventions 2 Calibration Overview 2 What Is Calibration 3 Why Should You Calibrate 3 How Often Should You Calibrate 3 W...

Page 2: ...which alerts you to important information This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash bold Bold text denotes items that you must s...

Page 3: ...ion can be used to determine the measurement error and can correct for it in the adjustment process The calibration process consists of verifying adjusting and reverifying a device During verification...

Page 4: ...voltage modes for any measurements or the accuracy is irrelevant you have the option to skip these steps in the calibration procedure Complete calibration except current modes If you do not use the c...

Page 5: ...n for connecting the AUX CURRENT and SENSE HI binding posts of the calibrator alternatively you can use one of the Pomona B 4 cables instead of this wire National Instruments PXI chassis and controlle...

Page 6: ...t 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 Documentation In ad...

Page 7: ...your calibration utility Note NI DMM versions earlier than 2 1 do not support NI 4070 calibration The procedures in this document are described using C function calls You also can program in LabVIEW u...

Page 8: ...uency Mode Is this a Pre Adjustment or Post Adjustment Verification Setting up the Test Equipment Go to Verifying DC Voltage Go to Verifying AC Voltage Go to Verifying 4 Wire Resistance Go to Verifyin...

Page 9: ...wchart Verification Go to Adjusting DC Voltage and Resistance Go to Adjusting AC Voltage Modes No No Yes Yes No Yes Go to Verification Procedures Flowchart Completing the Adjustment Procedures Adjust...

Page 10: ...le the scientific notation number 10e 6 must be entered as 0 00001 and the number 100e3 must be entered as 100000 If your programming language supports numeric entries in scientific notation NI recomm...

Page 11: ...for the thermal EMF to stabilize 3 Call niDMM_reset 4 Call niDMM_ConfigureMeasurement with the following parameters Function NIDMM_VAL_DC_VOLTS Range 1 Resolution 1e 6 5 Set the input resistance of t...

Page 12: ...asurement with the following parameters Function NIDMM_VAL_DC_VOLTS Range 100 Resolution 1e 6 15 Set the input resistance of the NI 4070 to 10 M by calling niDMM_SetAttributeViReal64 with the followin...

Page 13: ...ctor block plugged into the NI 4070 and with the spade lugs connected to the appropriate calibrator binding posts Figure 3 shows the calibrator cable assembly Table 1 lists the assignments of the spad...

Page 14: ...DMM_ConfigureMultiPoint with the following parameters Trigger Count 1 Sample Count 10 Sample Trigger NIDMM_VAL_IMMEDIATE Sample Interval 1 28 Call niDMM_ReadMultiPoint with the following parameters Ma...

Page 15: ...prevents a 50 calibrator output resistance from creating a voltage divider with the internal resistance of the NI 4070 33 Call niDMM_ConfigureMeasurement with the following parameters Function NIDMM_V...

Page 16: ...Attribute_Value NIDMM_VAL_10_MEGAOHM 42 Call niDMM_Read Subtract the previously stored 100 mV 10 M mode offset from this measurement and verify that the result falls between the limits listed in Tabl...

Page 17: ...IDMM_VAL_DC_VOLTS Range 10 Resolution 10e 6 56 Set the input resistance of the NI 4070 to 10 G by calling niDMM_SetAttributeViReal64 with the following parameters Attribute_ID NIDMM_ATTR_INPUT_RESISTA...

Page 18: ...ters 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 11 69 Output 100 V on the ca...

Page 19: ...rmed correctly to avoid shorting or electrical shock from high voltage on unconnected spade lugs 2 Connect the calibration cable assembly with the connector block plugged into the NI 4070 and with the...

Page 20: ...at this measurement falls between the limits listed in Table 12 d Call niDMM_ConfigureMeasurement again changing Mode to NIDMM_VAL_AC_VOLTS_DCCOUPLED e Call niDMM_Read Verify that this measurement fal...

Page 21: ...AC_VOLTS and the remaining parameters as shown in Table 3 for the current iteration c Call niDMM_Read Verify that this measurement falls between the limits listed in Table 12 d Call niDMM_ConfigureMea...

Page 22: ...DMM_VAL_AC_VOLTS 0 5 500e 9 500 mV 50 Hz NIDMM_VAL_AC_VOLTS _DCCOUPLED 0 5 500e 9 2 500 mV 1 kHz NIDMM_VAL_AC_VOLTS 0 5 500e 9 500 mV 1 kHz NIDMM_VAL_AC_VOLTS _DCCOUPLED 0 5 500e 9 3 500 mV 1 kHz NIDM...

Page 23: ..._AC_VOLTS_DCCOUPLED e Call niDMM_Read Verify that this measurement falls between the limits listed in Table 12 Table 4 niDMM_ConfigureMeasurement Parameters Iteration Calibrator Output niDMM_Configure...

Page 24: ...nfigureMeasurement with Mode set to NIDMM_VAL_AC_VOLTS and the remaining parameters as shown in Table 5 for the current iteration c Call niDMM_Read Verify that this measurement falls between the limit...

Page 25: ...reMeasurement Parameters Iteration Calibrator Output niDMM_ConfigureMeasurement Parameters Amplitude Frequency Function Range Resolution 1 50 V 50 Hz NIDMM_VAL_AC_VOLTS 50 50e 6 50 V 50 Hz NIDMM_VAL_A...

Page 26: ...ureMeasurement again changing Mode to NIDMM_VAL_AC_VOLTS_DCCOUPLED e Call niDMM_Read Verify that this measurement falls between the limits listed in Table 12 Table 6 niDMM_ConfigureMeasurement Paramet...

Page 27: ...e the following steps 1 Reset the calibrator Caution Step 2 must be performed correctly to avoid shorting on unconnected spade lugs 2 Connect the calibration cable assembly with the connector block pl...

Page 28: ...he tolerances listed in Table 13 Tolerances are provided instead of absolute limits because your calibrator will have different discrete resistance values 7 Repeat step 6 for each of the remaining ite...

Page 29: ...ectly to avoid shorting on unconnected spade lugs 2 Connect the calibration cable assembly with the connector block plugged into the NI 4070 and with the spade lugs connected to the appropriate bindin...

Page 30: ...ample Interval 1 14 Call niDMM_ReadMultiPoint with the following parameters Maximum Time NIDMM_VAL_TIME_LIMIT_AUTO Array Size 4 Average the results by summing the returned reading array of the functio...

Page 31: ...ay 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 k range offset 21 Call niDMM_Configur...

Page 32: ...measurement Verify that the result falls between the tolerances listed in Table 14 30 Output 1 M on the calibrator with no external sense or 2 wire compensation 31 Call niDMM_ConfigureMeasurement wit...

Page 33: ...Call niDMM_Read Subtract the previously stored 1 k range offset from this measurement Verify that the result falls between the tolerances listed in Table 14 42 Output 100 on the calibrator with 2 wire...

Page 34: ...onnect a banana to banana cable or a wire AWG 22 between the AUX CURRENT binding post and the SENSE HI binding post of the calibrator 4 Output 0 A on the calibrator with the current output set to AUX...

Page 35: ...h the current output set to AUX 18 Call niDMM_ConfigureMeasurement with the following parameters Function NIDMM_VAL_DC_CURRENT Range 0 2 Resolution 200e 9 19 Call niDMM_Read Verify that this measureme...

Page 36: ...bration cable assembly with the connector block plugged into the NI 4070 and with the spade lugs connected to the appropriate binding posts on the calibrator as described in Figure 3 and Table 1 3 Con...

Page 37: ...ange 1 Resolution 1e 6 16 Call niDMM_Read Verify that this measurement falls between the limits listed in Table 16 17 Output 1 A at 1 kHz on the calibrator with the current output set to AUX 18 Call n...

Page 38: ...cable attached to the NI 6608 and plug the Pomona 4892 into the HI and LO terminals of the NI 4070 4 Call niDMM_reset to reset the NI 4070 to a known state 5 Call niDMM_ConfigureMeasurement with the...

Page 39: ...R_0 action ND_RESET 14 Repeat steps 8 through 13 with the following modification in steps 9 and 10 change paramValue to 500 when you call the function GPCTR_Change_Parameter 15 Repeat steps 8 through...

Page 40: ...ithin 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 ins...

Page 41: ...tput 100 mV on the calibrator with the range locked to 2 2 V 6 Call niDMM_CalAdjustGain with the following parameters Mode NIDMM_VAL_DC_VOLTS Range 0 1 Input Resistance NIDMM_VAL_10_MEGAOHM Expected M...

Page 42: ...M 18 Remove the shorting bar and plug the connector block of the calibration cable assembly back into the NI 4070 19 Wait one minute for the thermal EMF to stabilize 20 Output 10 M from the calibrator...

Page 43: ...mal EMF to stabilize 32 Output 100 M from the calibrator without external sense 33 Call niDMM_CalAdjustGain with the following parameters Mode NIDMM_VAL_2_WIRE_RES Range 100e6 Input Resistance NIDMM_V...

Page 44: ...ers Mode NIDMM_VAL_4_WIRE_RES Range 100e3 Input Resistance NIDMM_VAL_RESISTANCE_NA Expected Value the display on the calibrator for 0 43 Call niDMM_CalAdjustOffset with the following parameters Mode N...

Page 45: ...eled HS and LS from the calibrator Leave these spade lugs unplugged and ensure that they do not touch each other b Reconnect the 2wr COMP spade lug to the SENSE HI binding post of the calibrator c Rec...

Page 46: ...nt Modes section if you have opted not to adjust AC voltage If you are not performing the AC voltage or the current adjustments go to the Verification Procedures section to verify your new calibration...

Page 47: ...ons listed in Table 8 Table 8 niDMM_CalAdjustGain Parameters Iteration Calibrator Output niDMM_CalAdjustGain Parameters Amplitude Frequency Mode Range V Input Resistance Expected Value 1 50 mV 1 kHz N...

Page 48: ...ted under Calibrator Output in Table 10 for the current iteration b Call niDMM_CalAdjustACFilter with Mode set to NIDMM_VAL_AC_VOLTS and the remaining parameters as shown in Table 10 for the current i...

Page 49: ...0 05 1e3 50 mV 1 NIDMM_VAL_AC_VOLTS_ DCCOUPLED 0 05 1e3 2 50 mV 5 NIDMM_VAL_AC_VOLTS 0 05 5e3 50 mV 5 NIDMM_VAL_AC_VOLTS_ DCCOUPLED 0 05 5e3 3 50 mV 20 NIDMM_VAL_AC_VOLTS 0 05 20e3 50 mV 20 NIDMM_VAL_...

Page 50: ...0 NIDMM_VAL_AC_VOLTS 0 5 100e3 500 mV 100 NIDMM_VAL_AC_VOLTS_ DCCOUPLED 0 5 100e3 14 500 mV 200 NIDMM_VAL_AC_VOLTS 0 5 200e3 500 mV 200 NIDMM_VAL_AC_VOLTS_ DCCOUPLED 0 5 200e3 15 500 mV 300 NIDMM_VAL_...

Page 51: ...100e3 22 5 V 200 NIDMM_VAL_AC_VOLTS 5 200e3 5 V 200 NIDMM_VAL_AC_VOLTS_ DCCOUPLED 5 200e3 23 5 V 300 NIDMM_VAL_AC_VOLTS 5 300e3 5 V 300 NIDMM_VAL_AC_VOLTS_ DCCOUPLED 5 300e3 24 5 V 500 NIDMM_VAL_AC_VO...

Page 52: ...V 300 NIDMM_VAL_AC_VOLTS 50 300e3 50 V 300 NIDMM_VAL_AC_VOLTS_ DCCOUPLED 50 300e3 32 10 V 500 NIDMM_VAL_AC_VOLTS 50 500e3 10 V 500 NIDMM_VAL_AC_VOLTS_ DCCOUPLED 50 500e3 33 100 V 1 NIDMM_VAL_AC_VOLTS...

Page 53: ...EEPROM If you do not want to verify the adjustments you have just made go to the Completing the Adjustment Procedures section 36 100 V 50 NIDMM_VAL_AC_VOLTS 300 50e3 100 V 50 NIDMM_VAL_AC_VOLTS_ DCCO...

Page 54: ...ed spade lugs 2 Connect the calibration cable assembly with the connector block plugged into the NI 4070 and with the spade lugs connected to the appropriate binding posts on the calibrator as describ...

Page 55: ...ustGain with the following parameters Mode NIDMM_VAL_DC_CURRENT Range 0 2 Input Resistance NIDMM_VAL_RESISTANCE_NA Expected Value 0 2 15 Output 200 mA on the calibrator with the current output set to...

Page 56: ...iDMM_CalAdjustOffset with the following parameters Mode NIDMM_VAL_DC_CURRENT Range 1 Input Resistance NIDMM_VAL_RESISTANCE_NA 26 Call niDMM_CalAdjustOffset with the following parameters Mode NIDMM_VAL...

Page 57: ...u obtain in the Verification Procedures section DC Voltage Table 11 NI 4070 DC Voltage Verification Limits Calibrator Amplitude Range Input Resistance 2 Year Limits 24 Hour Limits Lower Upper Lower Up...

Page 58: ...971 V 0 05029 V 50 mV 300 kHz 50 mV AC DC 0 04845 V 0 05155 V 500 mV 30 Hz 500 mV DC 0 49945 V 0 50055 V 500 mV 50 Hz 500 mV AC DC 0 49965 V 0 50035 V 500 mV 1 kHz 500 mV AC DC 0 49965 V 0 50035 V 500...

Page 59: ...300 kHz 50 V AC DC 48 475 V 51 525 V 219 V 30 Hz 300 V DC 218 751 V 219 249 V 219 V 50 Hz 300 V AC DC 218 8305 V 219 1695 V 219 V 1 kHz 300 V AC DC 218 8305 V 219 1695 V 219 V 20 kHz 300 V AC DC 218 8...

Page 60: ...k 3 ppm 2 ppm 0 1 k 3 ppm 2 ppm 0 100 10 ppm 10 ppm Table 14 NI 4070 2 Wire Resistance Verification Tolerances Calibrator Resistance Range 2 Year Tolerance ppm of Range 24 Hour Tolerance ppm of Range...

Page 61: ...20 mA 20 0095 mA 19 9905 mA 200 mA 200 mA 199 916 mA 200 084 mA 200 mA 200 mA 200 084 mA 199 916 mA 1 A 1 A 0 99948 A 1 00052 A 1 A 1 A 1 00052 A 0 99948 A Table 16 NI 4070 AC Current Verification Li...

Page 62: ...cal Support section of ni com 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 aff...

Page 63: ...514 694 8521 Canada Toronto 905 785 0085 Canada Vancouver 514 685 7530 China 86 21 6555 7838 Czech Republic 420 2 2423 5774 Denmark 45 45 76 26 00 Finland 385 0 9 725 725 11 France 33 0 1 48 14 24 24...

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