National Instruments NI PXIe-4080 Manual

CALIBRATION PROCEDURE
PXIe-4080/4082
PXIe, 6½-Digit, ±300 V, Onboard 1.8 MS/s Isolated Digitizer, L and C
Measurement Support, PXI Digital Multimeter
This document contains the verification and adjustment procedures for the PXIe-4080/4082.
Refer to ni.com/calibration for more information about calibration solutions.
Contents
Required Software.....................................................................................................................2
Related Documentation.............................................................................................................2
Password................................................................................................................................... 2
Calibration Interval................................................................................................................... 2
Test Equipment..........................................................................................................................2
Calibration Procedures..............................................................................................................3
Initial Setup............................................................................................................................... 4
Test Conditions..........................................................................................................................4
As-Found and As-Left Limits................................................................................................... 5
Verification................................................................................................................................5
Verifying DC Voltage........................................................................................................5
Verifying AC Voltage........................................................................................................7
Verifying 4-Wire Resistance........................................................................................... 10
Verifying 2-Wire Resistance........................................................................................... 11
Verifying DC Current......................................................................................................14
Verifying AC Current......................................................................................................16
Verifying Capacitance and Inductance............................................................................17
Adjustment.............................................................................................................................. 18
Adjusting DC Voltage..................................................................................................... 18
Adjusting Resistance.......................................................................................................19
Adjusting AC Voltage..................................................................................................... 23
Adjusting Current............................................................................................................25
Adjusting Capacitance and Inductance........................................................................... 26
Completing the Adjustment Procedures......................................................................... 27
Reverification..........................................................................................................................27
Worldwide Support and Services............................................................................................ 27

Required Software
Calibrating the PXIe-4080/4082 requires you to install the following software on the
calibration system:
• NI-DMM version 15.2 or later
You can download all required software from ni.com/downloads.
Related Documentation
For additional information, refer to the following documents as you perform the calibration
procedure:
•NI Digital Multimeters Help
•NI PXIe-4080/4081/4082 Getting Started Guide
•PXIe-4080 Specifications
•PXIe-4082 Specifications
Visit ni.com/manuals for the latest versions of these documents.
Password
The default password for password-protected operations is NI.
Calibration Interval
Recommended calibration interval 2 years
Test Equipment
The following table lists the equipment required for calibrating your device. If you do not have
the recommended instruments, use these specifications to select a substitute calibration
standard.
2| ni.com | PXIe-4080/4082 Calibration Procedure

Equipment Recommended
Models
Where Used Minimum Requirements
Multifunction
calibrator
Fluke 5720A or
Fluke 5730A
Voltage, Current,
Resistance
Maintained at 90 day
specifications
Two sets of low
thermal electromotive
force (EMF) copper
cables
Fluke 5440 Voltage, Current
(1 set),
Resistance (2
sets)
Shielded twisted pair
copper cables with copper
or gold-plated copper
banana plugs
Banana shorting bar Pomona 5145 DCV, 2-Wire
Resistance
≤ 40 mΩ resistance
Double banana plug
with binding posts
Pomona 5405 2-Wire
Resistance
Gold-plated copper
Two insulated low
thermal EMF spade
lugs
Pomona 2305 2-Wire
Resistance
Gold-plated copper
25 Ω, 125 Ω, 5 kΩ, 100
kΩ resistors
Capacitance and
Inductance
(adjustment only)
• ≤ 1 % tolerance
• ≤ 5 ppm/C
temperature
coefficient
• ≤ 1 inch from resistor
to DMM terminals
270 pF, 1 nF, 100 nF,
10 µF, 1000 µF
capacitors
IET SCA series Capacitance ≤ 0.1% uncertainty
Banana-to-banana coax
cable
Pasternack PE3005 Capacitance ≤ 40 pF
Calibration Procedures
The calibration process includes the following steps:
•Initial Setup - Set up the test equipment.
•Verification Procedures - Verify the existing operation of the device. This step confirms
whether the device is operating within its specified range prior to calibration.
PXIe-4080/4082 Calibration Procedure | © National Instruments | 3

•Adjustment Procedures - Perform an external adjustment of the device that adjusts the
calibration constants with respect to standards of known values.
•Reverification - Repeat the verification procedure to ensure that the device is operating
within its specifications after adjustment.
Initial Setup
Note Ensure that both the calibrator and the PXIe-4080/4082 are warmed up for at
least 60 minutes before you begin this procedure.
To set up the test equipment, complete the following steps:
1. Remove all connections from the four inputs on the PXIe-4080/4082.
2. Verify that the calibrator has been calibrated within the time limits specified in the Test
Equipment section, and that DC zeros calibration has been performed within the last 30
days. Consult the calibrator user documentation for instructions.
Test Conditions
The following setup and environmental conditions are required to ensure the PXIe-4080/4082
meets published specifications:
• Ensure that the PXI Express chassis fan speed is set to HIGH and that the fan filters are
clean.
• Use PXI Express filler panels in all vacant slots to allow proper cooling.
• Plug the PXI Express chassis and the calibrator into the same power strip to avoid ground
loops.
• Power on and warm up both the calibrator and the PXIe-4080/4082 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 80%.
• Allow the calibrator to settle fully before taking any measurements. Consult the calibrator
user documentation for instructions.
• Allow the thermal EMF enough time to stabilize when you change connections to the
calibrator or the PXIe-4080/4082. 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.
• Clean any oxidation from the banana plugs on the cables before plugging them into the
binding posts of the calibrator or the connectors of the PXIe-4080/4082. Oxidation
4| ni.com | PXIe-4080/4082 Calibration Procedure

tarnishes the copper plugs so that they appear dull rather than shiny and leads to greater
thermal EMF.
• 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.
As-Found and As-Left Limits
The as-found limits are the published 2-year specifications for the device. NI uses these limits
to determine whether the device meets the device specifications when it is received for
calibration.
The as-left limits are based on the published 24-hour specifications for the device, with
consideration for measurement uncertainty. NI uses these limits to determine whether the
device will meet the device specifications over its calibration interval.
Where a TUR of less than 4:1 was determined, a guardband technique was applied to the test
limits to maintain the same Probability of False Accepts (PFA) as if it was 4:1. The method
selected was the ANSI/NCSL Z540.3 method 6: Guard Bands Based on Test Uncertainty
Ratio.
Verification
The performance verification procedures assume that adequate traceable uncertainties are
available for the calibration references.
You can use the verification procedures described in this section for both pre-adjustment and
post-adjustment verification. You can omit sections (for example, the Verifying AC Current
section), however, any function not verified during post-adjustment will no longer be traceable
and should not be used for measurements.
Note Self-calibrate the PXIe-4080/4082 before performing verification procedures.
Verifying DC Voltage
Complete the following steps to verify DC voltage:
1. Plug in the shorting bar across the HI and LO terminals on the PXIe-4080/4082.
2. Wait two minutes for thermal EMF to stabilize.
3. Reset the PXIe-4080/4082.
4. Initialize the PXIe-4080/4082 for DC Voltage with a range of 100 mV and resolution of
6.5 digits.
5. Verify the accuracy for each configuration in the following table:
a) Acquire the measurement at each specified range and input resistance.
b) Compare to the specified limits.
PXIe-4080/4082 Calibration Procedure | © National Instruments | 5

DMM Settings As-Found Limits As-Left Limits
Range Input Resistance Lower Upper Lower Upper
100 mV >10 GΩ/10 MΩ -4.0 µV 4.0 µV -3.0 µV 3.0 µV
1 V >10 GΩ/10 MΩ -8 µV 8 µV -4 µV 4 µV
10 V >10 GΩ/10 MΩ -0.06 mV 0.06 mV -0.02 mV 0.02 mV
100 V 10 MΩ -0.6 mV 0.6 mV -0.2 mV 0.2 mV
300 V 10 MΩ -6 mV 6 mV -2 mV 2 mV
6. Remove the shorting bar from the PXIe-4080/4082.
7. Set the calibrator to Standby.
8. Connect the PXIe-4080/4082 to the calibrator using low thermal EMF cables according to
the following figure.
Figure 1. Voltage Connection Configuration
OUTPUT
A
SENSE
AUX
CURRENT
V-GUARD GROUND
NI DMM Calibrator
HI
LO
Not Connected
HI
LO
V-GUARD
9. Wait two minutes for the thermal EMF to stabilize.
10. Set the PXIe-4080/4082 and Calibrator configuration as shown the following table.
11. Acquire the specified measurements and record them for use as the offset nulls in the
following steps.
DMM Settings Calibrator Settings
Range Input Resistance Range DCV Amplitude
100 mV > 10 GΩ 2.2 V 0 V
100 mV 10 MΩ 2.2 V 0 V
6| ni.com | PXIe-4080/4082 Calibration Procedure

12. Verify the accuracy for each configuration in the following table:
a) Set the PXIe-4080/4082 to the specified configuration and commit.
b) Set the calibrator to the specified configuration and allow it to settle.
c) Acquire the specified measurement.
d) Subtract the appropriate offset null you recorded previously and compare the result
to the limits.
e) Repeat for each listed input resistance.
f) Set the calibrator to Standby.
DMM Settings Calibrator
Settings
As-Found Limits (V) As-Left Limits (V)
Range Input
Resistance
DCV
Amplitude1
Lower Upper Lower Upper
100 mV >10 GΩ/
10 MΩ
100 mV 0.0999935 0.1000065 0.0999971 0.1000029
-100 mV -0.1000065 -0.0999935 -0.1000029 -0.0999971
1 V >10 GΩ/
10 MΩ
1 V 0.999969 1.000031 0.999989 1.000011
-1 V -1.000031 -0.999969 -1.000011 -0.999989
10 V >10 GΩ/
10 MΩ
10 V 9.99969 10.00031 9.99993 10.00007
-10 V -10.00031 -9.99969 -10.00007 -9.99993
100 V 10 MΩ 100 V 99.9959 100.0041 99.9989 100.0011
-100 V -100.0041 -99.9959 -100.0011 -99.9989
300 V 10 MΩ 300 V 299.984 300.017 299.995 300.005
-300 V -300.017 -299.984 -300.005 -299.995
You have completed verifying the DC voltage mode of the PXIe-4080/4082. Select one of the
following options:
• If you want to continue verifying other modes, go to the Verifying AC Voltage section.
• If you do not want to verify any additional modes, and you are performing a pre-
adjustment verification, close the session.
• If you do not want to verify any additional modes, and you want to update the verification
time stamp, complete the following steps:
1. Open a new calibration session to the instrument (with correct calibration password).
2. Close the calibration session with the Action set to Save.
Verifying AC Voltage
Complete the following steps to verify AC voltage:
1. Set the calibrator to Standby mode.
1For the ± 100 mV test points, lock the calibrator range to 2.2 V.
PXIe-4080/4082 Calibration Procedure | © National Instruments | 7

2. Connect the PXIe-4080/4082 to the calibrator using low leakage cables, as shown in
Figure 1. on page 6.
3. Reset the PXIe-4080/4082.
4. Initialize the PXIe-4080/4082 for AC Voltage with a range of 50 mV and resolution of
6.5 digits.
5. Verify the accuracy for each configuration in the following table:
a) Set the PXIe-4080/4082 to the listed configuration and commit.
b) Set the Calibrator to the listed configuration and allow it to settle.
c) Acquire the specified measurement and compare the result to the limits.
d) Repeat for each listed coupling.
e) Set the calibrator to Standby.
DMM Settings Calibrator Settings As-Found Limits (V)
Range Coupling Amplitude Frequency Lower Upper
50 mV AC / DC 5 mV 1 kHz 0.0049775 0.0050225
DC 50 mV 30 Hz 0.0499300 0.0500700
AC / DC 50 mV 50 Hz 0.0499550 0.0500450
50 mV 1 kHz 0.0499550 0.0500450
500 mV 50 mV 1 kHz 0.049875 0.050125
50 mV 50 mV 20 kHz 0.0499550 0.0500450
50 mV 50 kHz 0.0499350 0.0500650
50 mV 100 kHz 0.0497100 0.0502900
50 mV 300 kHz 0.0484500 0.0515500
500 mV DC 500 mV 30 Hz 0.499450 0.500550
AC / DC 500 mV 50 Hz 0.499650 0.500350
500 mV 1 kHz 0.499650 0.500350
5 V 500 mV 1 kHz 0.49875 0.50125
500 mV 500 mV 20 kHz 0.499650 0.500350
500 mV 50 kHz 0.499450 0.500550
500 mV 100 kHz 0.497400 0.502600
500 mV 300 kHz 0.484750 0.515250
8| ni.com | PXIe-4080/4082 Calibration Procedure

DMM Settings Calibrator Settings As-Found Limits (V)
Range Coupling Amplitude Frequency Lower Upper
5 V DC 5 V 30 Hz 4.99450 5.00550
AC / DC 5 V 50 Hz 4.99650 5.00350
5 V 1 kHz 4.99650 5.00350
50 V 5 V 1 kHz 4.9875 5.0125
5 V 5 V 20 kHz 4.99650 5.00350
5 V 50 kHz 4.99450 5.00550
5 V 100 kHz 4.97400 5.02600
5 V 300 kHz 4.84750 5.15250
50 V DC 50 V 30 Hz 49.9450 50.0550
AC /DC 50 V 50 Hz 49.9650 50.0350
50 V 1 kHz 49.9650 50.0350
300 V 50 V 1 kHz 49.915 50.085
50 V 50 V 20 kHz 49.9650 50.0350
50 V 50 kHz 49.9450 50.0550
50 V 100 kHz 49.7400 50.2600
50 V 300 kHz 48.4750 51.5250
300 V DC 219 V 30 Hz 218.751 219.249
AC / DC 300 V 50 Hz 299.790 300.210
219 V 1 kHz 218.831 219.170
219 V 20 kHz 218.831 219.170
219 V 50 kHz 218.743 219.257
219 V 100 kHz 217.845 220.155
70 V 300 kHz 67.750 72.250
You have completed verifying the AC voltage mode of the PXIe-4080/4082. Select one of the
following options:
PXIe-4080/4082 Calibration Procedure | © National Instruments | 9

• If you want to continue verifying other modes, proceed to the Verifying 4-Wire Resistance
section.
• If you do not want to verify any additional modes and you are performing a pre-
adjustment verification, close the session.
• If you do not want to verify any additional modes, and you want to update the verification
time stamp, complete the following steps:
1. Open a new calibration session to the instrument (with correct calibration password).
2. Close the calibration session with the Action set to Save.
Verifying 4-Wire Resistance
Complete the following steps to verify 4-wire resistance:
1. Set the calibrator to Standby
2. Connect the PXIe-4080/4082 to the calibrator using low thermal EMF cables, as shown in
the following figure.
Figure 2. 4-Wire Resistance Connection Configuration
OUTPUT
A
SENSE
AUX
CURRENT
V-GUARD GROUND
NI DMM
HI
LO
HI SENSE
LO SENSE
Not Connected
Calibrator
HI
LO
HI SENSE
LO SENSE
V-GUARD
3. Wait two minutes for thermal EMF to stabilize.
4. Reset the PXIe-4080/4082.
5. Configure the PXIe-4080/4082 for 4-wire resistance measurements with a resolution of
6.5 digits.
6. Verify the accuracy for each configuration in the following table:
a) Acquire the measurement at each specified configuration.
b) Compare to the specified tolerances.
Note Tolerances are provided instead of absolute limits because your
calibrator will have different discrete resistance values.
10 | ni.com | PXIe-4080/4082 Calibration Procedure

DMM Settings Calibrator Settings Tolerances
As-Found As-Left
Range Offset
Compensated
Ohms (OCO)
Resistance Ext
Sense
Comp ppm of
Reading
ppm
of
Range
ppm of
Reading
ppm
of
Range
10 MΩ Off 0 Ω On None - 10 - 2
1 MΩ Off 0 Ω On None - 10 - 2
100
kΩ
Off 0 Ω On None - 8 - 4
10 kΩ On 0 Ω On None - 3 - 2.2
1 kΩ On 0 Ω On None - 3 - 2.2
100 Ω On 0 Ω On None - 13.4 - 11.2
10 MΩ Off 10 MΩ On None 800 10 100 2
1 MΩ Off 1 MΩ On None 95 10 32 2
100
kΩ
Off 100 kΩ On None 95 6 15 2
10 kΩ On 10 kΩ On None 80 3 12 2.2
1 kΩ On 1 kΩ On None 80 3 18 2.2
100 Ω On 100 Ω On None 82 13.4 23 11.2
Note Apply an offset null to the 100 kΩ measurement by subtracting the
corresponding 0 Ω measurement in the 100 kΩ range.
You have completed verifying the 4-wire resistance mode of the PXIe-4080/4082. Select one
of the following options:
• If you want to continue verifying other modes, go to the Verifying 2-Wire Resistance
section.
• If you do not want to verify any additional modes and you are performing a pre-
adjustment verification, close the session.
• If you do not want to verify any additional modes, and you want to update the verification
time stamp, complete the following steps:
1. Open a new calibration session to the instrument (with correct calibration password).
2. Close the calibration session with the Action set to Save.
Verifying 2-Wire Resistance
Complete the following steps to verify 2-wire resistance:
1. Plug in the shorting bar across the HI and LO terminals on the PXIe-4080/4082.
PXIe-4080/4082 Calibration Procedure | © National Instruments | 11

2. Wait two minutes for thermal EMF to stabilize.
3. Reset the PXIe-4080/4082.
4. Verify the accuracy for each configuration in the following table:
a) Acquire the measurement at each specified configuration.
b) Compare to the specified tolerances.
DMM Settings Tolerances (ppm of range)
As-Found As-LeftRange OCO
100 MΩ Off 10 10
10 MΩ Off 10 2
1 MΩ Off 10 2
100 kΩ Off 10 6
10 kΩ On 23 22
1 kΩ On 203 202
100 Ω On 2015 2010
5. Remove the shorting bar from the PXIe-4080/4082.
6. Set the calibrator to Standby.
7. Connect the PXIe-4080/4082 to the calibrator using low thermal EMF cables, as shown in
Figure 1. on page 6.
8. Wait two minutes for thermal EMF to stabilize.
9. Verify the accuracy for each configuration in the following table:
a) Acquire the measurement at each specified configuration.
b) Compare to the specified tolerances.
DMM Settings Calibrator Settings Tolerances
As-Found As-Left
Range OCO Resistance Ext
Sense
Comp ppm of
Reading
ppm of
Range
ppm of
Reading
ppm of
Range
1 MΩ Off 0 Ω Off None - - - -
100 kΩ Off 0 Ω Off None - - - -
100 MΩ Off 100 MΩ Off None 3000 10 500 10
10 MΩ Off 10 MΩ Off None 800 10 100 2
12 | ni.com | PXIe-4080/4082 Calibration Procedure

DMM Settings Calibrator Settings Tolerances
As-Found As-Left
Range OCO Resistance Ext
Sense
Comp ppm of
Reading
ppm of
Range
ppm of
Reading
ppm of
Range
1 MΩ Off 1 MΩ Off None 95 10 32 2
100 kΩ Off 100 kΩ Off None 95 6 15 2
Note For the 1 MΩ and 100 kΩ measurements, subtract the corresponding
0 Ω measurement as an offset null.
10. Connect the PXIe-4080/4082 to the calibrator using low thermal EMF cables, as shown in
the following figure.
Figure 3. 2-Wire Resistance Low Range Connection Configuration
OUTPUT
A
SENSE
AUX
CURRENT
V-GUARD GROUND
NI DMM
HI
LO
HI
LO
Not Connected
Calibrator
HI
LO
HI SENSE
LO SENSE
V-GUARD
11. Wait two minutes for the thermal EMF to stabilize.
12. Verify the accuracy for each configuration in the following table:
a) Acquire the measurement at each specified configuration.
b) Compare to the specified tolerances.
PXIe-4080/4082 Calibration Procedure | © National Instruments | 13

DMM Settings Calibrator Settings Tolerances
As-Found As-Left
Range OCO Resistance Ext
Sense
Comp ppm of
Reading
ppm of
Range
ppm of
Reading
ppm of
Range
10 kΩ Off 10 kΩ On 2-Wire 80 23 12 22
1 kΩ Off 1 kΩ On 2-Wire 80 203 12 202
100 Ω Off 100 Ω On 2-Wire 80 2015 15 2010
You have completed verifying the 2-wire resistance mode of the PXIe-4080/4082. Select one
of the following options:
• If you want to continue verifying other modes, go to the Verifying DC Current section.
• If you are performing a pre-adjustment verification, close the session.
• If you do not want to verify any additional modes, and you want to update the verification
time stamp, complete the following steps:
1. Open a new calibration session to the instrument (with correct calibration password).
2. Close the calibration session with the Action set to Save.
Verifying DC Current
Complete the following steps to verify DC current:
1. Unplug all cables from the PXIe-4080/4082.
2. Reset the PXIe-4080/4082.
3. Initialize the PXIe-4080/4082 for DC current with a range of 20 mA and resolution of 6.5
digits.
4. Verify the accuracy for each configuration in the following table:
a) Acquire the measurement at each specified range.
b) Compare to the specified limits.
DMM Range As-Found Limits As-Left Limits
Lower Upper Lower Upper
20 mA -4.00 µA 4.00 µA -0.30 µA 0.30 µA
200 mA -4.0 µA 4.0 µA -3.0 µA 3.0 µA
1 A -50 µA 50 µA -15 µA 15 µA
5. Set the calibrator to Standby.
6. Connect the PXIe-4080/4082 to the calibrator using low leakage cables according to the
configuration in the following figure.
14 | ni.com | PXIe-4080/4082 Calibration Procedure

Figure 4. DC Current Connection Configuration
OUTPUT
A
SENSE
AUX
CURRENT
V-GUARD GROUND
NI DMM Calibrator
HI SENSE
LO
Not Connected
HI
LO
V-GUARD
7. Verify the accuracy for each configuration in the following table:
a) Set the PXIe-4080/4082 to the listed configuration and commit.
b) Set the calibrator to the listed configuration and allow it to settle.
c) Acquire the specified measurement and compare to the limits.
d) Set the calibrator to Standby after you have completed all test points in the DMM
Range.
DMM Range Calibrator Output As-Found Limits (A) As-Left Limits (A)
Lower Upper Lower Upper
20 mA 18 mA 0.01798790 0.01801210 0.01799902 0.01800098
20 mA -18 mA -0.01801210 -0.01798790 -0.01800098 -0.01799902
200 mA 180 mA 0.1798970 0.1801030 0.1799894 0.1800106
200 mA -180 mA -0.1801030 -0.1798970 -0.1800106 -0.1799894
1 A 900 mA 0.899320 0.900680 0.899942 0.900058
1 A -900 mA -0.900680 -0.899320 -0.900058 -0.899942
You have completed verifying the DC current of the PXIe-4080/4082. Select one of the
following options:
PXIe-4080/4082 Calibration Procedure | © National Instruments | 15

• If you want to continue verifying other modes, go to the Verifying AC Current section.
• If you do not want to verify any additional modes and you are performing a pre-
adjustment verification, close the session.
• If you do not want to verify any additional modes, and you want to update the verification
time stamp, complete the following steps:
1. Open a new calibration session to the instrument (with correct calibration password).
2. Close the calibration session with the Action set to Save.
Verifying AC Current
Complete the following steps to verify AC current:
1. Set the calibrator to Standby.
2. Connect the PXIe-4080/4082 to the calibrator using low leakage cables as shown in
Figure 4. on page 15.
3. Reset the PXIe-4080/4082.
4. Initialize the PXIe-4080/4082 for AC Current with a range of 10mA and a resolution of
6.5 digits.
5. Verify the accuracy for each configuration in the following table:
a) Set the PXIe-4080/4082 to the listed configuration and commit.
b) Set the Calibrator to the listed configuration and allow it to settle.
c) Acquire the specified measurement and compare to the limits.
d) Set the calibrator to Standby if you have completed all test points in a DMM
Range.
Calibrator Settings DMM Range Limits (A)
Amplitude Frequency Lower Upper
1 mA 1 kHz 10 mA 0.00099760 0.00100240
10 mA 1 kHz 10 mA 0.00999400 0.01000600
10 mA 1 kHz 100 mA 0.0099760 0.0100240
100 mA 55 Hz 100 mA 0.0999400 0.1000600
100 mA 5 kHz 1 A 0.099700 0.100300
1 A 1 kHz 1 A 0.998800 1.001200
You have completed verifying AC current for the PXIe-4080/4082. Select one of the following
options:
16 | ni.com | PXIe-4080/4082 Calibration Procedure

• If you want to continue verifying the PXIe-4082, go to the Verifying Capacitance and
Inductance section.
• If you do not want to verify any additional modes and are performing a pre-adjustment
verification, close the session.
• If you do not want to verify any additional modes, and you want to update the verification
time stamp, complete the following steps:
1. Open a new calibration session to the instrument (with correct calibration password).
2. Close the calibration session with the Action set to Save.
Verifying Capacitance and Inductance
Complete the following steps to verify capacitance and inductance for the PXIe-4082:
Note The PXIe-4082 inductance accuracy is theoretically verified if the
capacitance accuracy meets its specification. If you have access to precision
inductors, you can verify the inductance measurements by comparing your results
with the published accuracy specifications.
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
capacitance range. For example, you can use a 1 nF verification capacitor to test both the 10
nF and 1 nF ranges.
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 inputs of the
PXIe-4082, 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 PXIe-4082, 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 PXIe-4082 before performing the verification procedure.
1. Disconnect any fixtures or cables from the device.
2. Reset the PXIe-4082.
3. Verify the accuracy for each configuration in the following table:
a) Connect the indicated standard to the device and wait the recommended settling
time.
b) Configure the device as indicated in DMM Range and take a measurement.
c) Compare the acquired value to the specified tolerances.
d) Repeat the previous steps for each standard listed in the table.
PXIe-4080/4082 Calibration Procedure | © National Instruments | 17

Standard Recommended Settling Time DMM Range Tolerance
% of Reading % of Range
OPEN (0 pF) 0 s 300 pF - 0.6
SHORT (0 µH) 0 s 10 µH - 1
270 pF 30 s 300 pF 0.5 0.6
1 nF 30 s 1 nF 0.4 0.2
1 nF 30 s 10 nF 0.3 0.1
100 nF 30 s 100 nF 0.3 0.1
100 nF 30 s 1 µF 0.3 0.1
10 µF 30 s 10 µF 0.3 0.1
10 µF 30 s 100 µF 0.3 0.1
1,000 µF 30 s 1,000 µF 0.4 0.1
1,000 µF 30 s 10,000 µF 0.3 0.1
You have completed verifying the capacitance and inductance of the PXIe-4082. Select one of
the following options:
• If you are performing a pre-adjustment verification, close the session.
• To update the verification time stamp, complete the following steps:
1. Open a new calibration session to the instrument (with correct calibration password).
2. Close the calibration session with the Action set to Save.
Adjustment
This section explains how to adjust the PXIe-4080/4082. You can choose to perform these
adjustment procedures with or without performing the verification procedure first.
Note Repeat the verification procedures after you perform these adjustment
procedures. NI recommends that you perform a post-adjustment verification to
ensure that the device you have calibrated is operating within specifications after
adjustments.
Caution Do not skip any of the steps within a section of the adjustment
procedures.
Adjusting DC Voltage
Complete the following steps to adjust DC Voltage:
1. Disconnect all inputs from the PXIe-4080/4082.
2. Reset the calibrator.
18 | ni.com | PXIe-4080/4082 Calibration Procedure

3. Initialize an external calibration session to the PXIe-4080/4082.
4. Self-calibrate the PXIe-4080/4082.
5. Connect the PXIe-4080/4082 to the calibrator using low thermal EMF cables according to
the configuration shown in Figure 1. on page 6.
6. Wait two minutes for thermal EMF to stabilize.
7. Adjust the voltage gain with each configuration in the following table:
a) Output the specified voltage from the calibrator.
b) Call the niDMM Cal Adjust Gain VI or the niDMM_CalAdjustGain function
with the specified DMM settings.
Calibrator Settings DMM Settings
Function Range Input Resistance Expected Value
10 V DC Volts 10 V >10 GΩ 10 V
-10 V -10 V
8. Disconnect the cables from the PXIe-4080/4082, leaving the other end of the cable
connected to the calibrator binding posts.
9. Plug in the shorting bar across the HI and LO terminals on the PXIe-4080/4082.
10. Wait two minutes for the thermal EMF to stabilize.
11. Call the niDMM Cal Adjust Misc VI or the niDMM_CalAdjustMisc function with
Type set to NIDMM_EXTCAL_MISCCAL_VREF_DC_VOLTAGE.
12. Self-calibrate the PXIe-4080/4082.
13. Call the niDMM Cal Adjust Offset VI or the niDMM_CalAdjustOffset function
with the following parameters:
• Function: DC Volts
• Range: 100 mV
• Input Resistance: >10 GΩ
You have completed adjusting the DC voltage mode of the PXIe-4080/4082. Proceed to one of
the following sections:
•Adjusting Resistance
•Adjusting AC Voltage
•Adjusting Current
If you are not performing additional adjustments, proceed to the Completing the Adjustment
Procedures section to commit the calibration constants.
Adjusting Resistance
Note You must adjust DC voltage before you adjust resistance.
PXIe-4080/4082 Calibration Procedure | © National Instruments | 19

Note If you do not use the resistance modes for any measurements or the accuracy
of these modes is irrelevant, you can skip this section and go directly to the
Adjusting AC Voltage section.
Complete the following steps to adjust the resistance of the device:
1. Connect the PXIe-4080/4082 to the calibrator using low thermal EMF cables as shown in
Figure 2. on page 10.
2. Wait two minutes for thermal EMF to stabilize.
3. Adjust the resistance calibration with each configuration in the following table:
a) Commit the DMM to the specified range.
b) Configure the calibrator as specified.
c) Wait the specified settling time.
d) Call niDMM Cal Adjust Gain VI or the niDMM_CalAdjustGain function with
the specified parameters.
DMM Settings Calibrator Settings Minimum
Settling
Time
Function Range Input
Resistance
Expected
Value
Resistance Ext.
Sense
Comp
4-wire
resistance
10 kΩ N/A (value from
calibrator)
10 kΩ On None 1 s
(value from
calibrator)
0 Ω 1 s
100 kΩ N/A (value from
calibrator)
100 kΩ 10 s
(value from
calibrator)
0 Ω 1 s
4. Call the niDMM Cal Adjust Misc VI or the niDMM_CalAdjustMisc function with
Type set to NIDMM_EXTCAL_MISCCAL_RREF.
5. Adjust the resistance calibration with each configuration in the following table:
a) Commit the PXIe-4080/4082 to the specified range.
b) Configure the calibrator as specified.
c) Wait the specified settling time.
d) Call niDMM Cal Adjust Gain VI or the niDMM_CalAdjustGain function with
the specified parameters.
20 | ni.com | PXIe-4080/4082 Calibration Procedure