NI PXIe-4137 Manual

CALIBRATION PROCEDURE
PXIe-4137
PXIe, ±200 V, ±1 A (DC)/±3 A (Pulsed), 100 fA Precision System PXI
Source Measure Unit
This document contains the verification and adjustment procedures for the PXIe-4137. Refer
to ni.com/calibration for more information about calibration solutions.
Note In this document, the PXIe-4137 (40W) and PXIe-4137 (20W) are referred to
inclusively as the PXIe-4137. The information in this document applies to all
versions of the PXIe-4137 unless otherwise specified. To determine which version of
the module you have, locate the device name in one of the following places:
•In MAX—The PXIe-4137 (40W) shows NI PXIe-4137 (40W), and the
PXIe-4137 (20W) shows as NI PXIe-4137.
•Device front panel—The PXIe-4137 (40W) shows PXIe-4137 40W System
SMU, and the PXIe-4137 (20W) shows NI PXIe-4137 Precision System SMU
on the front panel.
Please review and become familiar with the entire procedure before beginning the calibration
process.
Contents
Required Software.....................................................................................................................2
Related Documentation.............................................................................................................2
Password................................................................................................................................... 3
Calibration Interval................................................................................................................... 3
Test Equipment..........................................................................................................................3
Test Conditions..........................................................................................................................5
Safety Guidelines for System Operation...................................................................................6
As-Found and As-Left Limits................................................................................................... 7
Calibration Overview................................................................................................................7
Verification................................................................................................................................8
Self-Calibrating the PXIe-4137........................................................................................ 9
Testing the Safety Interlock.............................................................................................. 9
Connecting and Configuring Equipment for Voltage Verification....................................9
Verifying Voltage Measurement and Output...................................................................10
Verifying Remote Sense Voltage Offset..........................................................................12
Verifying Voltage Remote Sense.....................................................................................12
Verifying Current Offset................................................................................................. 14
Verifying Load Regulation..............................................................................................15
Verifying 1 μA and 10 μA Current Measurement and Output........................................17

Verifying 100 μA to 100 mA Current Measurement and Output....................................19
Verifying 1 A and 3 A Current Measurement and Output.............................................. 21
Adjustment.............................................................................................................................. 23
Adjusted Specifications...................................................................................................23
Initiating the Adjustment Session................................................................................... 23
Voltage and Current Output............................................................................................ 24
Residual Offset Voltage...................................................................................................27
Closing the Adjustment Session..................................................................................... 28
Alternative to Performing Adjustment Procedures.........................................................28
Reverification..........................................................................................................................28
Setting the Calibration Due Date............................................................................................ 28
Revision History..................................................................................................................... 29
NI Services..............................................................................................................................29
Required Software
Calibrating the PXIe-4137 requires you to install the following software on the calibration
system:
• Supported driver software
– For PXIe-4137 (40W), install NI-DCPower 20.5 or later
– For PXIe-4137 (20W), install NI-DCPower 15.1 or later
• Supported application development environment (ADE)—LabVIEW or
LabWindows™/CVI™.
• Supported operating system—Windows.
When you install NI-DCPower, you need to install support only for the application software
that you intend to use. Access calibration support in the locations shown in the following table:
ADE Calibration Support Location
LabVIEW NI-DCPower Calibration palette
LabWindows/CVI NI-DCPower function panel (niDCPower.fp)
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 PXIe-4136/4137 Getting Started Guide
•NI DC Power Supplies and SMUs Help
•NI PXIe-4137 Specifications
•NI-DCPower Readme
•LabVIEW Help
2| ni.com | PXIe-4137 Calibration Procedure

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 1 year
Test Equipment
The following table lists the equipment NI recommends for the performance verification and
adjustment procedures. If the recommended equipment is not available, select a substitute that
meets the minimum required specifications listed in the table.
Table 1. Required Equipment for Calibration
Required
Equipment
Recommended Model(s) Parameter Measured Minimum
Specifications
Digital
multimeter
(DMM)
Keysight 3458A All parameters except
remote sense accuracy
Voltage: <±9 ppm
accuracy and
<100 nV resolution.
Current: <±25 ppm
accuracy and
<10 pA resolution.
1 MΩ current
shunt
IET Labs SRL-1M/1Triax 1 μA and 10 μA
current accuracy
<8 ppm accuracy,
<0.2 ppm / °C
tempco.
1 Ω current
shunt
Ohm Labs CS-1 1 A and 3 A current
accuracy
<50 ppm accuracy,
<5 ppm / °C
tempco.
3 kΩ resistor Vishay
PTF563K0000BYEB
Remote sense
accuracy
0.1% 250 mW
PXIe-4137 Calibration Procedure | © National Instruments Corporation | 3

Table 1. Required Equipment for Calibration (Continued)
Required
Equipment
Recommended Model(s) Parameter Measured Minimum
Specifications
SA-413B
Banana Jack
Adapter
NI 786818-01 Voltage Accuracy,
1 μA and 10 μA
Current accuracy,
100 µA to 100 mA
Current Output and
Measurement,3 A and
1 A Current Accuracy,
Voltage Adjustment,
Current Output and
Measurement
Adjustment
—
Low thermal
test leads
Fluke 5440A-7003 24 inch Voltage Verification
and Adjustment,
Remote Sense Voltage
Offset, 1 μA and
10 μA current
accuracy
Low Thermal
Copper EMF Plug-
In Cables, Spade
Connectors
Twisted-pair,
shielded cabling
wire
— Load Regulation 18 AWG to
20 AWG
Triax adapter
SA-413T
NI 784000-01 1 μA and 10 μA
Current accuracy
Triax adapter used
for connecting a
triax cable from the
PXIe-4137 to the
1 MΩ current shunt
BNC 3 Lug
Triax to BNC 3
Lug Triax
Pomona 5223-36 1 μA and 10 μA
Current accuracy
—
Shielded, 2
Conductor
22 AWG, Silver
Plated Copper
Cables
Belden 83319E 1 μA and 10 μA
Current accuracy,
100 µA to 100 mA
Current Output and
Measurement, 3 A and
1 A current accuracy
—
4| ni.com | PXIe-4137 Calibration Procedure

Table 1. Required Equipment for Calibration (Continued)
Required
Equipment
Recommended Model(s) Parameter Measured Minimum
Specifications
Solderless
Banana Plug
(Qty 2)
Pomona 122505A 1 μA and 10 μA
Current accuracy,
100 µA to 100 mA
Current Output and
Measurement, 3 A and
1 A current accuracy
—
Triaxial (F) to
BNC (M)
Adapter
Pomona 5299 1 μA and 10 μA
Current accuracy
—
BNC (F) to
Single Banana
Plug Adapter
Pomona 1894 1 μA and 10 μA
Current accuracy
—
Test Conditions
Follow the setup and environmental information below to ensure the PXIe-4137 meets the
published specifications.
• Ensure that the safety interlock terminal is open during verification procedures unless
specifically required. Ensure proper operator safety procedures when using the
PXIe-4137 with the interlock closed.
• Keep cabling as short as possible. Long cables act as antennas, picking up extra noise that
can affect measurements.
• Verify that all connections to the PXIe-4137, including front panel connections and
screws, are secure.
• Ensure that the PXI chassis fan filters, if present, are clean, and that the empty slots
contain filler panels.
• For chassis with slot cooling capacity = 38 W, ensure that the PXI chassis fan speed is set
to HIGH. For more information about cooling, refer to the Maintain Forced-Air Cooling
Note to Users document available at ni.com/manuals.
• Allow a warm-up time of at least 30 minutes after the chassis is powered on and
NI-DCPower is loaded and recognizes the PXIe-4137. The warm-up time ensures that the
PXIe-4137 and test instrumentation are at a stable operating temperature.
• Use shielded copper wire for all cable connections to the module. Use twisted-pair wire
to eliminate noise and thermal offsets.
PXIe-4137 Calibration Procedure | © National Instruments Corporation | 5

• To ensure the system has had adequate time to settle, wait one second after requesting a
new current or voltage or after changing a load before taking a measurement.
• When making measurements, configure the following aperture time-related settings:
– Set the niDCPower Aperture Time property or
NIDCPOWER_ATTR_APERTURE_TIME attribute to 2 power-line cycles (PLCs) on
the module.
– Set the niDCPower Aperture Time Units property or
NIDCPOWER_ATTR_APERTURE_TIME_UNITS to power line cycles.
– Set the niDCPower Configure Power Line Frequency property or the
NIDCPOWER_ATTR_POWER_LINE_FREQUENCY attribute to either 50 or 60
depending on the frequency of the AC power line in your location.
• Ensure that properties or attributes for the module that are not specified in calibration
procedures are set to their default values.
• When making measurements, configure any specified digital multimeters (DMMs) with
the best available ranges and measurement settings for each specified test point.
• Keep relative humidity between 10% and 70%, noncondensing.
• For verification procedures, maintain an ambient temperature of 23 °C ± 5 °C. Maintain
an internal device temperature range of Tcal ±1 °C.1
• For adjustment procedures, maintain an ambient temperature of 23 °C ±1 °C. The
PXIe-4137 internal temperature is greater than the ambient temperature.
Safety Guidelines for System Operation
Caution Hazardous voltages of up to the maximum voltage of the PXIe-4137 may
appear at the output terminals if the safety interlock terminal is closed. Open the
safety interlock terminal when the output connections are accessible. With the safety
interlock terminal open, the output voltage level/limit is limited to ±40 V DC, and
protection will be triggered if the voltage measured between the device HI and LO
terminals exceeds ±(42 V peak ±0.4 V).
Attention Des tensions dangereuses allant jusqu'à la tension maximale du
PXIe-4137 peuvent apparaître aux terminaux de sortie si le terminal de verrouillage
de sécurité est fermé. Ouvrez le terminal de verrouillage de sécurité lorsque les
connexions de sortie sont accessibles. Lorsque le terminal de verrouillage de sécurité
est ouvert, le niveau ou la limite de tension de sortie est limité à ± 40 V CC, et la
1Tcal is the internal device temperature recorded by the PXIe-4137 at the completion of the last self-
calibration. Call the niDCPower Get Self Cal Last Temp VI to query Tcal from the PXIe-4137.
6| ni.com | PXIe-4137 Calibration Procedure

protection se déclenchera si la tension mesurée entre les terminaux HI et LO de
l'appareil dépasse ± (42 Vpic ± 0,4 V).
Caution Do not apply voltage to the safety interlock connector inputs. The
interlock connector is designed to accept passive, normally open contact closure
connections only.
Attention N'appliquez pas de tension aux entrées du connecteur de verrouillage de
sécurité. Le connecteur de verrouillage est conçu pour accepter uniquement des
connexions à fermeture de contact passives, normalement ouvertes.
To ensure a system containing the PXIe-4137 is safe for operators, components, or conductors,
take the following safety precautions:
• Ensure proper warnings and signage exist for workers in the area of operation.
• Provide training to all system operators so that they understand the potential hazards and
how to protect themselves.
• Inspect connectors, cables, switches, and any test probes for any wear or cracking before
each use.
• Before touching any of the connections to the high terminal or high sense on the
PXIe-4137, discharge all components connected to the measurement path. Verify with a
DMM before interaction with connections.
As-Found and As-Left Limits
The as-found limits are the published 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 equal to the published NI specifications for the device, less guard bands
for measurement uncertainty, temperature drift, and drift over time. NI uses these limits to
determine whether the device will meet the device specifications over its calibration interval.
Calibration Overview
Calibration includes the steps shown in the following figure:
PXIe-4137 Calibration Procedure | © National Instruments Corporation | 7

Figure 1. Calibration Overview
Document
Post-Adjustment
Results
Document
Pre-Adjustment
Results
Calibration/
Verification
Complete
Yes No
Meets
Calibration Test
Limits?
Review Verification/
Adjustment Procedure
or Return Device
Verify
Adjust (Calibration Constants,
Dates, and Temperatures
Updated)
Verify
1. Initial setup—Install the PXIe-4137 and configure it in Measurement & Automation
Explorer (MAX).
2. Verification—Verify the existing operation of the PXIe-4137.
This step confirms whether the device is operating within the published specifications
prior to adjustment.
3. Adjustment—Adjust the calibration constants of the PXIe-4137.
4. Reverification—Repeat the Verification procedure to ensure that the device is operating
within the published specifications after adjustment.
Verification
This section provides instructions for verifying the PXIe-4137 specifications.
You must complete all verification procedures in the specified order.
8| ni.com | PXIe-4137 Calibration Procedure

You do not need to separately verify both measurement and output. The architecture of the
PXIe-4137 ensures that if measurement is accurate, then output is as well, and vice versa.
Note The performance verification procedures assume that adequate traceable
uncertainties are available for the calibration references.
Related Information
Reverification on page 28
Repeat the Verification on page 8 section to determine the as-left status of the PXIe-4137.
Self-Calibrating the PXIe-4137
Complete the following steps to self-calibrate the PXIe-4137.
1. Disconnect or disable all connections to the PXIe-4137.
2. Allow the PXIe-4137 30 minutes to warm up with the PXI chassis fans set to HIGH.
3. Initialize an NI-DCPower session.
4. Call the self-calibration function.
5. Close the NI-DCPower session.
Testing the Safety Interlock
In order to ensure safe operation of the PXIe-4137, test the safety interlock for proper
functionality before completing any verification procedures.
Testing with an Application Development Environment
1. Disconnect the output connector from the PXIe-4137 front panel.
2. Ensure that the safety interlock input on the test fixture is closed.
3. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Voltage for the PXIe-4137.
4. Set the voltage level range to 200 V, and set the voltage level to 42.4 V.
5. Set the current limit range to 1 mA, and set the current limit to 1 mA.
6. Initiate the session.
7. Verify that the Voltage Status Indicator is amber.
8. Open the safety interlock input using the test fixture.
9. Verify that the Voltage Status Indicator is red.
10. Reset the device using the niDCPower Reset VI or the niDCPower Reset function.
11. Verify that the Voltage Status Indicator is green.
Caution If the PXIe-4137 fails the safety interlock test, discontinue use of the
device and contact an authorized NI service representative to request a Return
Material Authorization (RMA).
Connecting and Configuring Equipment for Voltage
Verification
PXIe-4137 Calibration Procedure | © National Instruments Corporation | 9

1. Make the necessary connections for this procedure, as shown in the following figure:
Figure 2. Voltage Verification or Adjustment Connection Diagram
DMM
Voltage
Mode
+
–
NI-DCPower Device
Sense LO
Sense HI
Output HI
Output LO
2. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Voltage for the PXIe-4137.
Verifying Voltage Measurement and Output
Compare a set of voltages measured by a DMM to the voltage test points requested by the
PXIe-4137.
Refer to the following table as you complete the following steps.
Verify ranges in the order listed in the table.
10 | ni.com | PXIe-4137 Calibration Procedure

Table 2. Voltage Output and Measurement Verification
Level
Range
Limit
Range
and
Limit
Test
Point
As-Found Measurement
Test Limit
As-Left Measurement Test
Limit
Lower Upper Lower Upper
600 mV
1 mA
-600 mV -600.132
mV
-599.868
mV
-600.0355
mV
-599.9645
mV
0 mV -0.03 mV 0.03 mV -0.0115 mV 0.0115 mV
600 mV 599.868 mV 600.132 mV 599.9645 mV 600.0355 mV
6 V
-6 V -6.00111 V -5.99889 V -6.000212 V -5.999788 V
0 V -0.00009 V 0.00009 V -0.00005 V 0.00005 V
6 V 5.99889 V 6.00111 V 5.999788 V 6.000212 V
20 V
-20 V -20.0038 V -19.9962 V -20.000965 V -19.999035 V
0 V -0.0004 V 0.0004 V -0.000165 V 0.000165 V
20 V 19.9962 V 20.0038 V 19.999035 V 20.000965 V
200 V2
-200 V -200.0425 V -199.9575 V -200.01425 V -199.98575 V
0 V -0.0025 V 0.0025 V -0.00125 V 0.00125 V
200 V 199.9575 V 200.0425 V 199.9875 V 200.01425 V
Note The lower and upper voltage measurement test limits are calculated using the
following formula:
Voltage Measurement Test Limits = Test Point ± (|Test Point| * % of Voltage + Offset)
1. Set the first specified level range, limit range, and limit on the PXIe-4137.
2. Set the niDCPower Sense property or NIDCPOWER_ATTR_SENSE attribute to Local.
3. Measure the internal device temperature and perform self-calibration if necessary.
a) After measuring the internal device temperature, wait for the internal device
temperature to stabilize. Temperature is considered stable when it has not changed
by more than ±1 °C in the previous 5 minutes.
b) After the internal temperature has stabilized, if the temperature still exceeds
Tcal ± 1 °C, call the self-calibration VI or function.
4. Set the level on the PXIe-4137 to the first specified test point.
5. Compare a DMM voltage measurement to the voltage measurement test limits.
a) Take a voltage measurement using the DMM.
2Ensure that the safety interlock terminal is closed when verifying the 200 V range.
PXIe-4137 Calibration Procedure | © National Instruments Corporation | 11

b) Verify the DMM measurement falls within the test limits in the Voltage Output and
Measurement Verification table.
6. Repeat step 4 through step 5 for each test point.
7. Repeat step 1 through step 6 for each level range.
Verifying Remote Sense Voltage Offset
Compare a set of voltages measured by a DMM to the voltage test points requested by the
PXIe-4137.
Verify level ranges in the specified order. Use the same connections as the previous test.
Refer to the following table as you complete the following steps:
Table 3. Remote Sense Voltage Offset Verification
Level Range Limit Range
and Limit
Test Point As-Found
Measurement Test
Limit
As-Left Measurement
Test Limit
600 mV 1 mA 0 V ±30 μV ±11.5 μV
6 V ±90 μV ±50 μV
20 V ±400 μV ±165 μV
200 V ±2.5 mV ±1.25 mV
1. Set the first specified level range, limit range, and limit on the PXIe-4137.
2. Set the niDCPower Sense property or NIDCPOWER_ATTR_SENSE attribute to Remote.
3. Set the level on the PXIe-4137 to the first specified test point.
4. Compare a DMM voltage measurement to the voltage measurement test limits.
a) Take a voltage measurement using the DMM.
b) Verify the DMM measurement falls within the test limits.
5. Repeat step 1 through step 5 for each level range.
Verifying Voltage Remote Sense
Use the PXIe-4137 in constant current mode with a test circuit to simulate the voltage drop
between the device and a load.
Complete this procedure only after successfully completing all previous verification
procedures. Verify level ranges in the specified order.
Refer to the following table as you complete the following steps:
12 | ni.com | PXIe-4137 Calibration Procedure

Table 4. Remote Sense Voltage Output Verification
Level Range Limit Range
and Limit
Test Point Load1Load2Voltage Remote Sense Test
Limit
Load1Load2
1 mA 600 mV 0 mA 3 kΩ 3 kΩ ≤6 µV ≤6 µV
1 mA
1. Make the necessary connections for this procedure, as shown in the following figure:
Figure 3. Voltage Remote Sense Diagram, Part I3
NI-DCPower Device
Sense LO
Sense HI
Output HI
Output LO
Load1
2. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Current for the PXIe-4137.
3. Set the niDCPower Sense property or NIDCPOWER_ATTR_SENSE attribute to Remote.
4. Set the first specified level range, limit range, and limit on the PXIe-4137.
5. Measure the internal device temperature and perform self-calibration if necessary.
a) After measuring the internal device temperature, wait for the internal device
temperature to stabilize. Temperature is considered stable when it has not changed
by more than ±1 °C in the previous 5 minutes.
b) After the internal temperature has stabilized, if the temperature still exceeds
Tcal ± 1 °C, call the self-calibration VI or function.
6. Set the level on the PXIe-4137 to the first specified test point and enable the output.
7. Take a voltage measurement using the PXIe-4137.
8. Record the voltage from the previous step as V1.
9. Repeat step 6 through step 8 for the other test points specified in the level range, This
time, record the value as V2.
3Follow industry best practices for minimizing thermal electromotive force (EMF) when making the
necessary connections for this procedure.
PXIe-4137 Calibration Procedure | © National Instruments Corporation | 13

10. Calculate the remote sense error using the following formula, and then record the value.
Remote Sense Error = |V2 - V1|
11. Verify that the recorded value falls within the test limits.
12. Configure the PXIe-4137 output to disable.
13. Repeat the previous steps. This time, make the necessary connections as shown in the
following figure:
Figure 4. Voltage Remote Sense Diagram, Part II4
NI-DCPower Device
Sense LO
Sense HI
Output HI
Output LO
Load2
Verifying Current Offset
Remove all connections from the PXIe-4137 and confirm the current measured by the
PXIe-4137 at 0 V falls within the test limits.
Refer to the following table as you complete the following steps. Complete this procedure only
after successfully completing all previous verifcation procedures. Verify ranges in the order
listed in the table.
4Follow industry best practices for minimizing thermal electromotive force (EMF) when making the
necessary connections for this procedure.
14 | ni.com | PXIe-4137 Calibration Procedure

Table 5. Current Offset Verification
Level
Range
Limit Range Limit Test
Point
As-Found Offset
Test Limit
As-Left Offset Test
Limit
600 mV 1 μA 1 μA 0 mV ±40 pA ±17 pA
10 µA 10 µA ±300 pA ±130 pA
100 µA 100 µA ±2 nA ±970 pA
1 mA 1 mA ±20 nA ±9.7 nA
10 mA 10 mA ±200 nA ±97 nA
100 mA 100 mA ±2 μA ±970 nA
1 A 1 A ±20 μA ±8.5 µA
3 A 1 A ±600 μA ±85 µA
1. Disconnect all equipment from the output of the PXIe-4137.
2. Set the specified level range, limit range, and limit on the PXIe-4137.
3. Measure the internal device temperature and perform self-calibration if necessary.
a) After measuring the internal device temperature, wait for the internal device
temperature to stabilize. Temperature is considered stable when it has not changed
by more than ±1 °C in the previous 5 minutes.
b) After the internal temperature has stabilized, if the temperature still exceeds
Tcal ± 1 °C, call the self-calibration VI or function.
4. Take a current measurement using the PXIe-4137.
5. Record the value from the previous step.
6. Verify that the recorded value falls within the test limits.
7. Repeat step 2 through step 6 for each limit range.
8. Repeat step 2 through step 7 for each level range.
Verifying Load Regulation
Note Although load regulation is listed as a typical specification for the
PXIe-4137, verification is required. If the PXIe-4137 fails the load regulation
verification procedure, discontinue use of the device and contact an authorized NI
service representative to request a Return Material Authorization (RMA).
Refer to the following table as you complete the following steps:
PXIe-4137 Calibration Procedure | © National Instruments Corporation | 15

Table 6. Load Regulation Verification
Level Range Limit Range and Limit Test Point As-found/As-left Limit
10 mA 600 mV 10 mA 2 mV
1. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Current for the PXIe-4137.
2. Set the niDCPower Sense property or NIDCPOWER_ATTR_SENSE attribute to Local.
3. Make the necessary connections for this procedure, as shown in the following figure:
Figure 5. Load Regulation Connection Diagram
NI-DCPower Device
Sense LO
Sense HI
Output HI
Output LO
Note Connection wires should be 18 or 20 AWG and as short as possible to
ensure low resistance.
4. Set the first specified level range, limit range, and limit on the PXIe-4137.
5. Measure the internal device temperature and perform self-calibration if necessary.
a) After measuring the internal device temperature, wait for the internal device
temperature to stabilize. Temperature is considered stable when it has not changed
by more than ±1 °C in the previous 5 minutes.
b) After the internal temperature has stabilized, if the temperature still exceeds
Tcal ± 1 °C, call the self-calibration VI or function.
6. Set the level on the PXIe-4137 to the first specified test point.
7. Take a voltage measurement using the PXIe-4137.
8. Record the value from the previous step.
9. Verify that the recorded value falls within the test limits in the Load Regulation
Verification table.
16 | ni.com | PXIe-4137 Calibration Procedure

Verifying 1 μA and 10 μA Current Measurement and
Output
Compare a set of measured currents reported by the PXIe-4137 to the currents measured by a
DMM.
Refer to the following table as you complete the following steps.
Complete this procedure only after successfully completing all previous verification
procedures. Verify ranges in the order listed in the table.
Table 7. 1 µA and 10 µA Current Output and Measurement Verification
Level
Range
Limit
Range and
Limit
Shunt Test
Point
As-Found
Measurement Test
Limit (% of Current +
Offset)
As-Left
Measurement Test
Limit (% of Current +
Offset)
6 V 1 µA 1 MΩ -0.9 V 0.022% + 40 pA 0.0071% + 17 pA
0.9 V
20 V 10 µA -9 V 0.022% + 300 pA 0.0071% + 130 pA
9 V
Note The lower and upper voltage measurement test limits are calculated using the
following formula:
Current Measurement Test Limits = DMM Measured Current ± (|DMM Measured
Current| * % of Current + Offset)
1. Make the necessary connections for this procedure, as shown in the following figure:
PXIe-4137 Calibration Procedure | © National Instruments Corporation | 17

Figure 6. Current Connection Diagram, Part 1
NI-DCPower Device
Sense LO
Sense HI
Output HI
Output LO
+
–
Precision
Shunt
HI
Current Sense
LO
HI
LO
DMM
Voltage
Mode
Note Ensure to keep cabling as short as possible. Use twisted-pair wire to
eliminate noise and thermal offsets. When connecting to the IET Labs
SRL-1M/1Triax, use adapter SA-413T Triaxial adapter for PXIe-4137.
2. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Voltage for the PXIe-4137.
3. Set the first specified level range, limit range, and limit on the PXIe-4137.
4. Measure the internal device temperature and perform self-calibration if necessary.
a) After measuring the internal device temperature, wait for the internal device
temperature to stabilize. Temperature is considered stable when it has not changed
by more than ±1 °C in the previous 5 minutes.
b) After the internal temperature has stabilized, if the temperature still exceeds
Tcal ± 1 °C, call the self-calibration VI or function.
5. Set the level on the PXIe-4137 to the first specified test point.
Complete the following four steps within 5 minutes or less of completing step 4 in order
to ensure the internal device temperature remains stable.
6. Calculate the current through the shunt by completing the following steps.
a) Take a voltage measurement across the shunt using the DMM.
b) Divide the voltage measurement by the calibrated value of the shunt.
c) Record the calculated value as DMM Measured Current.
7. Disconnect the DMM. Leave the PXIe-4137 output on.
8. Leave the DUT connected to the shunt as shown in the following figure:
18 | ni.com | PXIe-4137 Calibration Procedure

Figure 7. Current Connection Diagram, Part 2
Sense LO
Sense HI
Output HI
Output LO
Precision
Shunt
NI-DCPower Device
9. Take a current measurement using the PXIe-4137.
10. Record the value from the previous step.
11. Verify that the recorded PXIe-4137 value falls within the test limits.
12. Repeat step 5 through step 11 for each test point.
13. Repeat step 3 through step 12 for each level range.
14. Configure the PXIe-4137 output to disable.
Verifying 100 μA to 100 mA Current Measurement and
Output
Compare a set of currents measured by a DMM to the current test points requested by the
PXIe-4137.
Complete this procedure only after successfully completing all previous verification
procedures. Verify ranges in the order listed in the table.
Refer to the following table as you complete the following steps:
PXIe-4137 Calibration Procedure | © National Instruments Corporation | 19

Table 8. 100 µA to 100 mA Current Output and Measurement Verification
Level
Range
Limit
Range
and
Limit Test Point
As-Found
Measurement Test
Limit
As-Left Measurement Test
Limit
Lower Upper Lower Upper
100 µA
6 V
-100 µA -100.024
µA
-99.976 µA -100.00797
µA
-99.99203 µA
100 µA 99.976 µA 100.024 µA 99.99203 µA 100.00797 µA
1 mA
-1 mA -1.00024
mA
-0.99976
mA
-1.0000797
mA
-0.9999203
mA
1 mA 0.99976
mA
1.00024
mA
0.9999203
mA
1.0000797
mA
10 mA
-10 mA -10.0024
mA
-9.9976
mA
-10.000807
mA
-9.999193
mA
10 mA 9.9976 mA 10.0024
mA
9.999193 mA 10.000807
mA
100 mA
-100 mA -100.024
mA
-99.976
mA
-100.01117
mA
-99.98883
mA
100 mA 99.976 mA 100.024
mA
99.98883 mA 100.01117
mA
Note The lower and upper voltage measurement test limits are calculated using the
following formula:
Current Measurement Test Limits = Test Point ± (|Test Point| * % of Current +
Offset)
1. Make the necessary connections for this procedure, as shown in the following figure:
20 | ni.com | PXIe-4137 Calibration Procedure