National Instruments NI PXIe-4141 Manual

CALIBRATION PROCEDURE
NI PXIe-4141
Four Channel Precision Source-Measure Unit (SMU)
This document contains the verification and adjustment procedures for the NI PXIe-4141
(NI 4141). Refer to ni.com/calibration for more information about calibration solutions.
Contents
Verification................................................................................................................................2
Required Software.............................................................................................................2
Related Documentation.....................................................................................................2
Password........................................................................................................................... 2
Calibration Interval........................................................................................................... 2
Test Equipment..................................................................................................................2
Test Conditions..................................................................................................................3
Calibration Overview........................................................................................................4
Self-Calibrating.................................................................................................................5
Voltage Output and Measurement..................................................................................... 5
Current Output and Measurement.....................................................................................7
Remote Sense....................................................................................................................9
Adjustment.............................................................................................................................. 12
Adjusted Specifications...................................................................................................13
Self-Calibrating...............................................................................................................13
Initiating the Adjustment Session................................................................................... 13
Connecting and Configuring Equipment for Voltage Adjustment..................................13
Adjusting Voltage Measurement..................................................................................... 14
Connecting and Configuring Equipment for Current Adjustment..................................15
Adjusting Current Measurement.....................................................................................15
Connecting and Configuring Equipment to Adjust Residual Offset Voltage..................16
Adjusting Residual Voltage Offset..................................................................................17
Adjusting Residual Current Offset..................................................................................17
Closing the Adjustment Session..................................................................................... 17
Alternative to Adjustment Procedures............................................................................ 17
Reverification..........................................................................................................................18
Worldwide Support and Services............................................................................................ 18

Verification
The performance verification procedures assume that adequate traceable uncertainties are
available for the calibration references.
Related Information
Reverification on page 18
Repeat the Verification section to determine the as-left status of the device.
Required Software
Calibrating the NI 4141 requires you to install the following software on the calibration
system:
• NI-DCPower. The NI 4141 was first supported in NI-DCPower 1.7.5.
• Supported application development environment (ADE)—LabVIEW or
LabWindows™/CVI™
• Supported operating system—Windows
You can download all required software from ni.com/downloads.
Related Documentation
You might find the following documents helpful as you perform the calibration procedure:
•NI DC Power Supplies and SMUs Getting Started Guide
•NI DC Power Supplies and SMUs Help
•NI PXIe-4141 Specifications
•NI-DCPower Readme
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
using the minimum requirements listed in the table.
2| ni.com | NI PXIe-4141 Calibration Procedure

Table 1. Required Equipment for Calibration
Required
Equipment
Recommended Model(s) Where Used Minimum
Specifications
Digital multimeter
(DMM)
Agilent 3458A1All parameters Voltage: <±26 ppm
accuracy and <1 µV
resolution
Current: <±100 ppm
accuracy and <5 pA
resolution
Two 50 Ω resistors Vishay
PTF5650R000BZEK
Voltage remote
sense
0.1% tolerance, 1/8 W
Two 10 Ω resistors Vishay
CMF5510R000BEEK
Current remote
sense
0.1% tolerance, 1/4 W
Two 100 Ω
resistors
Vishay
PTF65100R00BYEK
Current remote
sense
0.1% tolerance, 1/4 W
Two 1 kΩ resistors Vishay
PTF651K0000BYEK
Voltage and
current remote
sense
0.1% tolerance, 1/4 W
Two 10 kΩ
resistors
Vishay
PTF6510K000BYEK
Current remote
sense
0.1% tolerance, 1/4 W
Two 100 kΩ
resistors
Vishay
PTF65100K00BYEK
Current remote
sense
0.1% tolerance, 1/4 W
Test Conditions
The following setup and environmental conditions are required to ensure the NI 4141 meets
published specifications:
• 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 device, including front panel connections and screws,
are secure.
• Ensure that the PXI chassis fan speed is set to HIGH, that the fan filters (if present) are
clean, and that the empty slots contain slot blockers and filler panels. For more
1To take measurements in the 10 µA range with the Agilent 3458A, you must send your device to
the Agilent Primary Standards Lab for a special calibration to verify the 10 µA, 1 µA, and 100 nA
ranges.
NI PXIe-4141 Calibration Procedure | © National Instruments | 3

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 NI 4141. The warm-up time ensures that the
NI 4141 and test instrumentation are at a stable operating temperature.
• Use shielded copper wire for all cable connections to the device. Use twisted-pair wire to
eliminate noise and thermal offsets.
• 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.
• Keep relative humidity between 10% and 70%, noncondensing.
• Recalculate the test limits if they differ from the newest device specifications. Test limits
in this document are based on the July 2013 edition of the NI PXIe-4141 Specifications.
• When making measurements, set the niDCPower Aperture Time property or
NIDCPOWER_ATTR_APERTURE_TIME attribute to 2 power-line cycles (PLCs) on the
device. Set the niDCPower Aperture Time Units property or
NIDCPOWER_ATTR_APERTURE_TIME_UNITS to power line cycles.
• Do not use the NI-DCPower Soft Front Panel (SFP) to request test points for any
adjustment functions because you cannot set aperture time using the SFP.
• Ensure that properties or attributes for the device 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 levels and limits for each specified test point.
Temperature conditions specific to verification procedures:
• Maintain an ambient temperature of 23 °C ± 5 °C. Maintain an internal device
temperature range of Tcal ± 1 °C.2
Temperature conditions specific to adjustment procedures:
• Maintain an ambient temperature of 23 °C ± 1 °C. The NI 4141 internal temperature will
be greater than the ambient temperature.
Calibration Overview
Calibration includes the steps shown in the following figure.
2Tcal is the internal device temperature recorded by the NI 4141 at the completion of the last self-
calibration. Call the niDCPower Get Self Cal Last Temp VI to query Tcal from the NI 4141.
4| ni.com | NI PXIe-4141 Calibration Procedure

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 NI 4141 and configure it in Measurement & Automation
Explorer (MAX) .
2. Verification—Verify the existing operation of the NI 4141.
This step confirms whether the device is operating within the published specifications
prior to adjustment.
3. Adjustment—Adjust the calibration constants of the NI 4141.
4. Reverification—Repeat the Verification procedure to ensure that the device is operating
within the published specifications after adjustment.
Self-Calibrating
Complete the following steps to self-calibrate the device.
1. Disconnect or disable all connections to the device.
2. Ensure the device had 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.
Voltage Output and Measurement
Connecting and Configuring Equipment for Voltage Verification
1. Make the necessary connections for this procedure, as shown in the following figure.
NI PXIe-4141 Calibration Procedure | © National Instruments | 5

Figure 2. Voltage Verification or Adjustment Connection Diagram
DMM
Voltage
Mode
+
–
NI-DCPower Device
Sense LO
Sense HI
HI
LO
2. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Voltage for the NI 4141.
Verifying Voltage Output and Measurement
Compare a set of voltages measured by the external DMM to both a set of voltage test points
requested by the NI 4141 and to the measured voltages reported by the NI 4141.
Refer to the following table as you complete the following steps.
Table 2. Voltage Output and Measurement Verification
Level Range Limit Range
and Limit
Test Point As-Found Output
Test Limit (% of
Voltage + Offset)
As-Found Measurement
Test Limit (% of Voltage +
Offset)
10 V 1 mA -10 V 0.013% + 150 μV 0.013% + 150 μV
-7.5 V
5 V
-2.5 V
0 V
2.5 V
5 V
7.5 V
10 V
1. Set the first specified level range, limit range, and limit on the NI 4141.
2. Set the level on the NI 4141 to the first specified test point.
3. Take a voltage measurement using the DMM, and take a voltage measurement using the
NI 4141.
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4. Record the values from the previous step.
5. Calculate the lower and upper voltage output test limits using the following formula:
Voltage Output Test Limits = Test Point ± (|Test Point| × % of Voltage + Offset)
6. Verify that the recorded DMM value falls within the test limits.
7. Calculate the lower and upper voltage measurement test limits using the following
formula: Voltage Measurement Test Limits = DMM Measured Voltage ± (| DMM
Measured Voltage| × % of Voltage + Offset). Record the test limits.
8. Verify that the recorded NI 4141 value falls within the test limits.
9. If more than one test point per level range is specified, repeat the previous steps for each
test point, from setting the level to the test point on the NI 4141 up to this step.
10. If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
Current Output and Measurement
Connecting and Configuring Equipment for Current Verification
1. Make the necessary connections for this procedure, as shown in the following figure.
Figure 3. Current Verification or Adjustment Connection Diagram
NI-DCPower Device
Sense LO
Sense HI
HI
LO
DMM
Current
Mode
+
–
2. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Current for the NI 4141.
Verifying Current Output and Measurement
Compare a set of currents measured by the external DMM to both a set of current test points
requested by the NI 4141 and to the measured currents reported by the NI 4141.
Refer to the following table as you complete the following steps.
NI PXIe-4141 Calibration Procedure | © National Instruments | 7

Table 3. Current Output and Measurement Verification
Level Range Limit Range
and Limit
Test Point As-Found Output
Test Limit (% of
Current + Offset)
As-Found Measurement
Test Limit (% of Current +
Offset)
10 μA 10 V -10 μA 0.03% + 300 pA 0.03% + 300 pA
0 µA
10 μA
100 μA 10 V -100 μA 0.03% + 3.0 nA 0.03% + 3.0 nA
0 µA
100 μA
1 mA 10 V -1 mA 0.03% + 30 nA 0.03% + 30 nA
-750 μA
-500 μA
-250 μA
0 mA
250 μA
500 μA
750 μA
1 mA
10 mA 10 V -10 mA 0.03% + 300 nA 0.03% + 300 nA
0 mA
10 mA
100 mA 10 V -100 mA 0.03% + 3.0 μA 0.03% + 3.0 μA
0 mA
100 mA
1. Set the first specified level range, limit range, and limit on the NI 4141.
2. Set the level on the NI 4141 to the first specified test point.
3. Take a current measurement using the DMM, and take a current measurement using the
NI 4141.
4. Record the values from the previous step.
8| ni.com | NI PXIe-4141 Calibration Procedure

5. Calculate the lower and upper current output test limits using the following formula:
Current Output Test Limits = Test Point ± (|Test Point| × % of Current + Offset)
6. Verify that the recorded DMM value falls within the test limits.
7. Calculate the lower and upper current measurement test limits using the following
formula: Current Measurement Test Limits = DMM Measured Current ± (|DMM
Measured Current| × % of Current + Offset).
8. Verify that the recorded NI 4141 value falls within the test limits.
9. If more than one test point per level range is specified, repeat the previous steps for each
test point, from setting the level to the test point on the NI 4141 up to this step. For zero
current test points, disconnect all external equipment from the I/O connector on the
NI 4141 and take a current measurement solely with the NI 4141, in order to ensure that
the output current is zero. In calculations for zero current test points, substitute 0 A for
the DMM Measured Current.
10. If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
Remote Sense
Connecting and Configuring Equipment for Voltage Remote
Sense Accuracy Verification
1. Make the necessary connections for this procedure, as shown in the following figure.
Figure 4. Voltage Remote Sense Output Verification Connection Diagram
Load3
Load2
Load1
+
–
DMM
Load Voltage Measurements
DMM
LO Lead Drop Measurements
+
–
NI-DCPower Device
Sense LO
Sense HI
HI
LO DMM1
Voltage
Mode
DMM2
Voltage
Mode
2. Set the niDCPower Sense property or NIDCPOWER_ATTR_SENSE attribute to Remote.
3. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Voltage for the NI 4141.
NI PXIe-4141 Calibration Procedure | © National Instruments | 9

Verifying Voltage Remote Sense Accuracy
Use the NI 4141 in constant voltage 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.
Refer to the following table as you complete the following steps.
Table 4. Voltage Remote Sense Output Verification
Level Range Limit Range and Limit Test Point Load1Load2Load3
10 V 100 mA 10 V 50 Ω 1 kΩ 50 Ω
1. Set the first specified level range, limit range, and limit on the NI 4141.
2. Set the level on the NI 4141 to the first specified test point.
3. Measure the LO lead drop with DMM1 from the negative terminal of the device to the
negative side of Load2. Record the measurement as Lead Drop.
4. Measure the load voltage with DMM2 across Load2 where the sense leads connect.
Record the measurement as Load Voltage.
5. Calculate the upper and lower voltage remote sense test limits using the following
equation: Voltage Remote Sense Test Limit = 10 V ± (0.015 V + LO Lead Drop × 0.001).
Record the test limits.
6. Verify the Load Voltage measurement falls within the voltage remote sense test limits.
7. If more than one test point per level range is specified, repeat the previous steps for each
test point, from setting the level to the test point on the NI 4141 up to this step.
8. If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
Connecting and Configuring Equipment to Verify Current
Remote Sense Accuracy
1. Refer to the following figure to make the necessary connections to verify current remote
sense accuracy.
10 | ni.com | NI PXIe-4141 Calibration Procedure

Figure 5. Current Remote Sense Output Verification Connection Diagram
Sense LO
Sense HI
HI
LO
Load2
Load1
DMM
Current
Mode
+
–
Lead Drop 1
Lead Drop 2
NI-DCPower Device
2. Set the niDCPower Sense property or NIDCPOWER_ATTR_SENSE attribute to Remote.
3. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Current for the NI 4141.
Verifying Current Remote Sense Accuracy
Use the NI 4141 in constant current mode with a test circuit to simulate the voltage drop
between the device and a load.
Measure all of the specified resistors using the DMM before you connect equipment. Record
the values.
Refer to the following table as you complete the following steps.
Table 5. Current Remote Sense Output Verification
Level Range Limit Range and Limit Test Point Load1Load2Base Limit
10 µA 10 V -10 µA 100 kΩ 100 kΩ 3.3 nA
0 µA
10 µA
100 μA 10 V -100 μA 10 kΩ 10 kΩ 33 nA
0 μA
100 μA
1 mA 10 V -1 mA 1 kΩ 1 kΩ 330 nA
0 mA
1 mA
NI PXIe-4141 Calibration Procedure | © National Instruments | 11

Table 5. Current Remote Sense Output Verification (Continued)
Level Range Limit Range and Limit Test Point Load1Load2Base Limit
10 mA 10 V -10 mA 100 Ω 100 Ω 3.3 μA
0 mA
10 mA
100 mA 10 V -100 mA 10 Ω 10 Ω 33 μA
0 mA
100 mA
1. Set the first specified level range, limit range, and limit on the NI 4141.
2. Set the level on the NI 4141 to the first specified test point.
3. Calculate the total lead drop using the following steps.
a) Take a current measurement using the DMM. Record the value.
b) Calculate the voltage across Load1 using the following formula: DMM Measured
Current * Load1. Record as Lead Drop 1.
c) Calculate the voltage across Load2 using the following formula: DMM Measured
Current * Load2. Record as Lead Drop 2.
d) Calculate the total lead drop using the following equation: Total Lead Drop = Lead
Drop 1 + Lead Drop 2. Record the value.
4. Calculate the upper and lower current remote sense test limits using the following
equation: Current Remote Sense Test Limit = Test Point ± (Base Limit + (Total Lead Drop
× 0.02% of Level Range). Record the test limits.
5. Verify the recorded DMM current falls within the test limits.
6. If more than one test point per level range is specified, repeat the previous steps for each
test point, from setting the level to the test point on the NI 4141 up to this step.
7. If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
Adjustment
This section describes the steps needed to adjust the NI 4141 to meet published specifications.
Related Information
For information on VIs and functions used in adjustment, refer to the NI DC Power and SMUs
Help
12 | ni.com | NI PXIe-4141 Calibration Procedure

Adjusted Specifications
Adjustment corrects the following specifications for the device:
• Voltage programming accuracy
• Current programming accuracy
• Voltage measurement accuracy
• Current measurement accuracy
Following the adjustment procedure automatically updates the calibration date and
temperature on the device.
Note You do not need to separately adjust both measurement and output. The
architecture of the NI 4141 ensures that if measurement is accurate, then output is as
well, and vice versa.
Self-Calibrating
Complete the following steps to self-calibrate the device.
1. Disconnect or disable all connections to the device.
2. Ensure the device had 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.
Initiating the Adjustment Session
Initiate an external calibration session (a special type of NI-DCPower session) by calling
the niDCPower Initialize External Calibration VI or niDCPower_InitExtCal
function.
(Optional) You can close the session and commit the new constants to hardware after you
complete each adjustment procedure.
Related Information
Closing the Adjustment Session on page 17
Connecting and Configuring Equipment for Voltage
Adjustment
1. Make the necessary connections for this procedure, as shown in the following figure.
NI PXIe-4141 Calibration Procedure | © National Instruments | 13

Figure 6. Voltage Verification or Adjustment Connection Diagram
DMM
Voltage
Mode
+
–
NI-DCPower Device
Sense LO
Sense HI
HI
LO
2. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Voltage for the NI 4141.
Adjusting Voltage Measurement
Compare a set of measured voltages reported by the NI 4141 to the voltages measured by an
external DMM. You do not need to separately verify or adjust both measurement and output.
The architecture of the NI 4141 ensures that if measurement is accurate, then output is as well,
and vice versa.
Refer to the following table as you complete the following steps.
Table 6. Voltage Measurement Adjustment
Level Range Limit Range and Limit Test Point
10 V 1 mA 10 V
-10 V
1. Set the first specified level range, limit range, and limit on the NI 4141.
2. Set the level on the NI 4141 to the first specified test point.
3. Take a voltage measurement using the DMM, and take a voltage measurement using the
NI 4141.
4. Store the values from the previous step as inputs for the niDCPower Cal Adjust VI or
function called in the following steps.
5. If more than one test point per level range is specified, repeat the previous steps for each
test point, from setting the level to the test point on the NI 4141 up to this step.
6. If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
14 | ni.com | NI PXIe-4141 Calibration Procedure

7. Update the measurement calibration constants by configuring and calling the niDCPower
Cal Adjust Voltage Measurement VI or
niDCPower_CalAdjustVoltageMeasurement function.
a) Input the DMM measurements as the measured outputs.
b) Input the NI 4141 measurements as the reported outputs.
c) Input the specified level range as the range.
Connecting and Configuring Equipment for Current
Adjustment
1. Make the necessary connections for this procedure, as shown in the following figure.
Figure 7. Current Verification or Adjustment Connection Diagram
NI-DCPower Device
Sense LO
Sense HI
HI
LO
DMM
Current
Mode
+
–
2. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Current for the NI 4141.
Adjusting Current Measurement
Compare a set of measured currents reported by the NI 4141 to the currents measured by an
external DMM.
Refer to the following table as you complete the following steps.
Table 7. Current Measurement Adjustment
Level Range Limit Range and Limit Test Point
10 μA 10 V 10 μA
-10 μA
100 μA 10 V 100 μA
-100 μA
NI PXIe-4141 Calibration Procedure | © National Instruments | 15

Table 7. Current Measurement Adjustment (Continued)
Level Range Limit Range and Limit Test Point
1 mA 10 V 1 mA
-1 mA
10 mA 10 V 10 mA
-10 mA
100 mA 10 V 100 mA
-100 mA
1. Set the first specified level range, limit range, and limit on the NI 4141.
2. Set the level on the NI 4141 to the first specified test point.
3. Take a current measurement using the DMM, and take a current measurement using the
NI 4141.
4. Store the values from the previous step as inputs for the niDCPower Cal Adjust VI or
function called in the following steps.
5. If more than one test point per level range is specified, repeat the previous steps for each
test point, from setting the level to the test point on the NI 4141 up to this step. For zero
current test points, disconnect all external equipment from the I/O connector on the
NI 4141 and take a current measurement solely with the NI 4141, in order to ensure that
the output current is zero. In calculations for zero current test points, substitute 0 A for
the DMM Measured Current.
6. If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
7. Update the measurement calibration constants by configuring and calling the VI
niDCPower Cal Adjust Current Measurement or
niDCPower_CalAdjustCurrentMeasurement function.
a) Input the DMM measurements as the measured outputs.
b) Input the NI 4141 measurements as the reported outputs.
c) Input the specified level range as the range.
Connecting and Configuring Equipment to Adjust
Residual Offset Voltage
1. Make the necessary connections for this procedure, as shown in the following figure.
16 | ni.com | NI PXIe-4141 Calibration Procedure

Figure 8. Residual Voltage Adjustment Diagram
NI-DCPower Device
Sense LO
Sense HI
HI
LO
2. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Voltage for the NI 4141.
Adjusting Residual Voltage Offset
Eliminate residual offset voltage at 0 V by configuring and calling the niDCPower Cal
Adjust Residual Voltage Offset VI or
niDCPower_CalAdjustResidualVoltageOffset function.
Adjusting Residual Current Offset
1. Disconnect all equipment from the output of the NI 4141.
2. Eliminate offset current at 0 A by configuring and calling the niDCPower Cal Adjust
Residual Current Offset VI or
niDCPower_CalAdjustResidualCurrentOffset function.
Closing the Adjustment Session
Close the session and commit the new constants to hardware by calling the niDCPower
Close External Calibration VI or niDCPower_CloseExtCal function and specifying
Commit as the calibration close action.
Alternative to Adjustment Procedures
If your device passes all verification procedures successfully and you want to skip updating
the calibration constants, you can update solely the calibration date by completing the
following steps.
Note NI recommends following all adjustment procedures in order to update the
calibration constants and renew the device calibration interval.
1. Call one of the following:
• niDCPower Initialize External Calibration VI
•niDCPower_InitExtCal function
NI PXIe-4141 Calibration Procedure | © National Instruments | 17

2. Call one of the following, specifying Commit in calibration close action:
• niDCPower Close External Calibration VI
•niDCPower_CloseExtCal function
Reverification
Repeat the Verification section to determine the as-left status of the device.
Note If no as-left test limits are specified in a procedure, reuse the as-found test
limits.
Note If any test fails reverification after performing an adjustment, verify that you
have met the Test Conditions before returning your device to NI. Refer to the
Worldwide Support and Services section for information about support resources or
service requests.
Related Information
Test Conditions on page 3
Verification on page 2
Worldwide Support and Services
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can obtain the DoC for your product by visiting ni.com/certification. If your product supports
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18 | ni.com | NI PXIe-4141 Calibration Procedure

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NI PXIe-4141 Calibration Procedure | © National Instruments | 19

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