National Instruments NI PXIe-4139 Handbuch

CALIBRATION PROCEDURE

NI PXIe-4139

Single-Channel Precision Source-Measure Unit (SMU)

This document contains the verification and adjustment procedures for the PXIe-4139. 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..........................................................................................................................3

Test Conditions..........................................................................................................................3

As-Found and As-Left Limits................................................................................................... 4

Calibration Overview................................................................................................................5

Verification................................................................................................................................5

Self-Calibrating the PXIe-4139........................................................................................ 6

Connecting and Configuring Equipment for Voltage Verification....................................6

Verifying Voltage Measurement and Output.....................................................................6

Verifying Remote Sense Voltage Offset............................................................................8

Verifying Voltage Remote Sense.......................................................................................8

Verifying Current Offset................................................................................................. 10

Verifying Load Regulation.............................................................................................. 11

Verifying 1 μA and 10 μA Current Measurement and Output........................................12

Verifying 100 μA to 100 mA Current Measurement and Output....................................14

Verifying 1 A and 3 A Current Measurement and Output.............................................. 16

Adjustment.............................................................................................................................. 17

Adjusted Specifications...................................................................................................18

Initiating the Adjustment Session................................................................................... 18

Voltage and Current Output............................................................................................ 18

Residual Offset Voltage...................................................................................................22

Closing the Adjustment Session..................................................................................... 23

Alternative to Performing Adjustment Procedures.........................................................23

Reverification..........................................................................................................................23

Worldwide Support and Services............................................................................................ 23

Required Software

Calibrating the PXIe-4139 requires you to install the following software on the calibration

system:

• 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-4138/4139 Getting Started Guide

•NI DC Power Supplies and SMUs Help

•PXIe-4139 Specifications

•NI-DCPower Readme

•LabVIEW Help

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

2| ni.com | NI PXIe-4139 Calibration Procedure

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.

Table 1. Required Equipment for Calibration

Required

Equipment

Recommended Model(s) Parameter

Measured

Minimum

Specifications

Digital

multimeter

(DMM)

Keysight 3458 A 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

< 4 ppm accuracy, <

0.2 ppm / °C tempco.

1 Ω current

shunt

Ohm Labs CS-1 1 A current

accuracy

<65 ppm accuracy, <

5 ppm / °C tempco.

333 mΩ current

shunt

Ohm Labs CS-3 3 A current

accuracy

< 120 ppm accuracy, <

5 ppm / °C tempco.

3 kΩ resistor Vishay PTF563K0000BYEB Remote sense

accuracy

0.1% 250 mW

Test Conditions

Follow the setup and environmental information below to ensure the PXIe-4139 meets the

published specifications. Test limits in this document are based on the January 2016 edition of

the PXIe-4139 Specifications, except for more recently revised remote sense test limits.

• 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-4139, 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

information about cooling, refer to the Maintain Forced-Air Cooling Note to Users

document available at ni.com/manuals.

NI PXIe-4139 Calibration Procedure | © National Instruments | 3

• 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-4139. The warm-up time ensures that the

PXIe-4139 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.

• 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 device.

– 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.

• 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 ranges and measurement settings for each specified test point.

• 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-4139 internal temperature is greater than the ambient temperature.

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.

1Tcal is the internal device temperature recorded by the PXIe-4139 at the completion of the last self-

calibration. Call the niDCPower Get Self Cal Last Temp VI to query Tcal from the PXIe-4139.

4| ni.com | NI PXIe-4139 Calibration Procedure

Calibration Overview

Calibration includes the steps shown in the following figure:

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-4139 and configure it in Measurement & Automation

Explorer (MAX).

2. Verification—Verify the existing operation of the PXIe-4139.

This step confirms whether the device is operating within the published specifications

prior to adjustment.

3. Adjustment—Adjust the calibration constants of the PXIe-4139.

4. Reverification—Repeat the Verification procedure to ensure that the device is operating

within the published specifications after adjustment.

Verification

The performance verification procedures assume that adequate traceable uncertainties are

available for the calibration references.

NI PXIe-4139 Calibration Procedure | © National Instruments | 5

You do not need to separately verify both measurement and output. The architecture of the

PXIe-4139 ensures that if measurement is accurate, then output is as well, and vice versa.

Related Information

Reverification on page 23

After completing adjustment, wait a minimum of five minutes for the internal device

temperature to stabilize. Repeat the Verification section to determine the as-left status of

the device.

Self-Calibrating the PXIe-4139

Complete the following steps to self-calibrate the PXIe-4139.

1. Disconnect or disable all connections to the PXIe-4139.

2. Allow the PXIe-4139 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.

Connecting and Configuring Equipment for Voltage

Verification

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

2. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION

attribute to DC Voltage for the PXIe-4139.

Verifying Voltage Measurement and Output

Compare a set of voltages measured by a DMM to the voltage test points requested by the

PXIe-4139.

Refer to the following table as you complete the following steps.

Verify ranges in the order listed in the table.

6| ni.com | NI PXIe-4139 Calibration Procedure

Table 2. Voltage Output and Measurement Verification

Level

Range

Limit

Range and

Limit

Test Point As-Found

Measurement Test

Limit (% of Voltage +

Offset)

As-Left Measurement

Test Limit (% of Voltage

+ Offset)

600 mV 1 mA -600 mV 0.016% + 30 μV 0.0065% + 25 μV

0 mV

600 mV

6 V 1 mA -6 V 0.016% + 90 μV 0.0045% + 85 μV

0 V

6 V

60 V 1 mA -60 V 0.016% + 900 μV 0.0065% + 820 μV

0 V

60 V

1. Set the first specified level range, limit range, and limit on the PXIe-4139.

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) If the internal device temperature exceeds Tcal ±1 °C, wait up to five minutes for the

temperature to stabilize to within Tcal ±1 °C.

b) If after five minutes the stable temperature still exceeds Tcal ±1 °C, call the self-

calibration VI or function.

4. Set the level on the PXIe-4139 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.

b) Calculate the lower and upper voltage measurement test limits using the following

formula:

Voltage Measurement Test Limits = Test Point ± (|Test Point| * % of Voltage + Offset)

c) Verify the DMM measurement 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 PXIe-4139 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.

NI PXIe-4139 Calibration Procedure | © National Instruments | 7

Verifying Remote Sense Voltage Offset

Compare a set of voltages measured by a DMM to the voltage test points requested by the

PXIe-4139.

Refer to the following table as you complete the following steps.

Verify ranges in the order listed in the table. Use the same connections as the previous test.

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 ±25 μV

6 V ±90 μV ±85 μV

60 V ±900 μV ±820 μV

1. Set the first specified level range, limit range, and limit on the PXIe-4139.

2. Set the niDCPower Sense property or NIDCPOWER_ATTR_SENSE attribute to Remote.

3. Set the level on the PXIe-4139 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. If more than one level range is specified, repeat the previous steps using the values

specified in each level range.

Verifying Voltage Remote Sense

Use the PXIe-4139 in constant current mode with a test circuit to simulate the voltage drop

between the device and a load.

Refer to the following table as you complete the following steps.

Table 4. Remote Sense Voltage Output Verification

Level

Range

Limit Range

and Limit

Test Point Load1 Load2 Voltage Remote Sense Test

Limit

Load1 Load2

1 mA 600 mV 0 mA 3 kΩ 3 kΩ ≤38.4 µV ≤6 µV

1 mA

1. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION

attribute to DC Current for the PXIe-4139.

8| ni.com | NI PXIe-4139 Calibration Procedure

2. Set the niDCPower Sense property or NIDCPOWER_ATTR_SENSE attribute to Remote.

3. Make the necessary connections for this procedure, as shown in the following figure:

Figure 3. Voltage Remote Sense Diagram, Part 12

NI-DCPower Device

Sense LO

Sense HI

Load1

4. Set the first specified level range, limit range, and limit on the PXIe-4139.

5. Measure the internal device temperature and perform self-calibration if necessary.

a) If the internal device temperature exceeds Tcal ±1 °C, wait up to five minutes for the

temperature to stabilize to within Tcal ±1 °C.

b) If after five minutes the stable temperature still exceeds Tcal ±1 °C, call the self-

calibration VI or function.

6. Set the level on the PXIe-4139 to the first specified test point.

7. Take a voltage measurement using the PXIe-4139.

8. Record the voltage from the previous step as V1.

9. Repeat the previous three steps for the other test point specified in the range. This time,

record the value as V2.

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. Repeat the previous steps. This time, make the necessary connections as shown in the

following figure:

2Follow industry best practices for minimizing thermal electromotive force (EMF) when making the

necessary connections for this procedure.

NI PXIe-4139 Calibration Procedure | © National Instruments | 9

Figure 4. Voltage Remote Sense Diagram, Part 23

NI-DCPower Device

Sense LO

Sense HI

Load2

Verifying Current Offset

Remove all connections from the PXIe-4139 and confirm the current measured by the

PXIe-4139 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 verification

procedures. Verify ranges in the order listed in the table.

Table 5. Current Offset Verification

Level

Range

Limit

Range and

Limit

Test

Point

As-Found Offset Test

Limit

As-Left Offset Test Limit

Lower Limit Upper

Limit

Lower Limit Upper

Limit

600 mV 1 μA 0 mV -40 pA 40 pA -25 pA 25 pA

10 µA -300 pA 300 pA -200 pA 200 pA

100 µA -2 nA 2 nA -1.5 nA 1.5 nA

1 mA -20 nA 20 nA -15 nA 15 nA

10 mA -200 nA 200 nA -150 nA 150 nA

100 mA -2 μA 2 μA -1.5 μA 1.5 μA

1 A -20 μA 20 μA -15 μA 15 μA

3 A -600 μA 600 μA -500 μA 500 μA

3Follow industry best practices for minimizing thermal electromotive force (EMF) when making the

necessary connections for this procedure.

10 | ni.com | NI PXIe-4139 Calibration Procedure

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