National Instruments NI PXIe-4138 Handbuch

CALIBRATION PROCEDURE

NI PXIe-4138

Single-Channel System Source-Measure Unit (SMU)

This document contains the verification and adjustment procedures for the

National Instruments PXIe-4138 (NI 4138). Refer to ni.com/calibration for more information

about calibration solutions.

Contents

Software Requirements............................................................................................................. 1

Related Documentation.............................................................................................................2

Password................................................................................................................................... 2

Calibration Interval................................................................................................................... 3

Test Equipment..........................................................................................................................3

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

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

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

Verification................................................................................................................................6

Self-Calibrating.................................................................................................................6

Voltage and Current Verification.......................................................................................6

Adjustment.............................................................................................................................. 15

Adjusted Specifications...................................................................................................15

Initiating the Adjustment Session................................................................................... 15

Voltage and Current Output............................................................................................ 16

Residual Offset Voltage...................................................................................................20

Closing the Adjustment Session..................................................................................... 20

Alternative to Adjustment Procedures............................................................................ 20

Reverifying..............................................................................................................................21

Worldwide Support and Services............................................................................................ 21

Software Requirements

Calibrating the NI 4138 requires the following software on your system. All required NI

software is available at ni.com/downloads.

• NI-DCPower 1.9 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)

Related Documentation

Consult the following documents for information about the NI 4138, NI-DCPower, and your

application software. Visit ni.com/manuals for the latest versions of these documents.

Table 1. Documentation Locations and Descriptions for Calibration

Document Location Description

NI DC Power Supplies

and SMUs Getting

Started Guide

Available from the Start menu

and at ni.com/manuals.

Contains instructions for

installing and configuring NI

power supplies and SMUs.

NI DC Power Supplies

and SMUs Help

Available from the Start menu

and in HTML format at

ni.com/manuals.

Contains detailed information

about the NI 4138 and NI-

DCPower LabVIEW VI and C

function programming

references.

NI PXIe-4138

Specifications

Available from the Start menu

and at ni.com/manuals.

Contains the published

specification values for the

NI 4138.

NI-DCPower Readme Available from the Start

menu.

Contains operating system and

application software support in

NI-DCPower.

LabVIEW Help Available by selecting Help»

LabVIEW Help from within

LabVIEW or at ni.com/

manuals.

Contains LabVIEW

programming concepts and

reference information.

Password

The default password for password-protected operations is NI.

2| ni.com | NI PXIe-4138 Calibration Procedure

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.

Table 2. Required Equipment for Calibration

Required

Equipment

Recommended

Model(s)

Parameter

Measured

Minimum Specifications

Digital

multimeter

(DMM)

Agilent 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 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

The following setup and environmental conditions are required to ensure the NI 4138 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

NI PXIe-4138 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 4138. Allow adequate warm-up time for all

other instruments and equipment according to the manufacturer instructions. The warm-

up time ensures that the NI 4138 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.

• Test limits in this document are based on the December 2013 edition of the NI PXIe-4138

Specifications, except for more recently revised remote sense test limits.

• 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 ± 5 °C.1

Temperature conditions specific to adjustment procedures:

• Maintain an ambient temperature of 23 °C ± 1 °C. The NI 4138 internal temperature will

be 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.

1Tcal is the internal device temperature recorded by the NI 4138 at the completion of the last self-

calibration. Call the niDCPower Get Self Cal Last Temp VI to query Tcal from the NI 4138.

4| ni.com | NI PXIe-4138 Calibration Procedure

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.

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 4138 and configure it in Measurement & Automation

Explorer (MAX) .

2. Verification—Verify the existing operation of the NI 4138. This step confirms whether

the device is operating within the published specifications prior to adjustment.

3. Adjustment—Adjust the calibration constants of the NI 4138.

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

within the published specifications after adjustment.

Refer to the following sections to complete each procedure.

NI PXIe-4138 Calibration Procedure | © National Instruments | 5

Verification

The performance verification procedures assume that adequate traceable uncertainties are

available for the calibration references.You must complete all verification procedures in the

specified order.

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 and Current Verification

You do not need to separately verify or adjust both measurement and output. The architecture

of the NI 4138 ensures that if measurement is accurate, then output is as well, and vice versa.

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 NI 4138.

Verifying Voltage Measurement and Output

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

by the NI 4138.

Verify ranges in the specified order.

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

6| ni.com | NI PXIe-4138 Calibration Procedure

Table 3. 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 0.02% + 100 μV 0.0065% + 25 μV

0 mV

600 mV

6 V 1 mA -6 V 0.02% + 600 μV 0.0045% + 85 μV

0 V

6 V

60 V 1 mA -60 V 0.02% + 6 mV 0.0065% + 820 μV

0 V

60 V

1. Set the first specified level range, limit range, and limit on the NI 4138.

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

a) If the internal device temperature exceeds Tcal ± 1 °C, wait up to 5 minutes for the

temperature to stabilize to within Tcal ± 1 °C.

b) If after 5 minutes the stable temperature still exceeds Tcal ± 1 °C, call the self-

calibration VI or function.

3. Set the level on the NI 4138 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) 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.

5. Repeat the previous steps, from setting the level to the test point on the NI 4138 up to this

step, for each specified test point in the level range.

6. 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 NI 4138 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 ranges in the specified order.

NI PXIe-4138 Calibration Procedure | © National Instruments | 7

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 Load1Load2Voltage Remote Sense Test

Limit

Load1Load2

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 NI 4138.

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 NI 4138.

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 5 minutes for the

temperature to stabilize to within Tcal ± 1 °C.

b) If after 5 minutes the stable temperature still exceeds Tcal ± 1 °C, call the self-

calibration VI or function.

6. Set the level on the NI 4138 to the first specified test point.

7. Take a voltage measurement using the NI 4138.

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: Remote Sense Error = |V2 -

V1|. Record the value.

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

necessary connections for this procedure.

8| ni.com | NI PXIe-4138 Calibration Procedure

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:

Figure 4. Voltage Remote Sense Diagram, Part 23

NI-DCPower Device

Sense LO

Sense HI

Load2

Verifying Offset Current

Remove all connections from the NI 4138 and confirm the current measured by the NI 4138 at

0 V falls within the test limits.

Complete this procedure only after successfully completing all previous verification

procedures. Verify ranges in the specified order.

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

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

necessary connections for this procedure.

NI PXIe-4138 Calibration Procedure | © National Instruments | 9

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 -200 pA 200 pA -25 pA 25 pA

10 µA -1.4 nA 1.4 nA -200 pA 200 pA

100 µA -12 nA 12 nA -1.5 nA 1.5 nA

1 mA -120 nA 120 nA -15 nA 15 nA

10 mA -1.2 μA 1.2 μA -150 nA 150 nA

100 mA -12 μA 12 μA -1.5 μA 1.5 μA

1 A -120 μA 120 μA -15 μA 15 μA

3 A -1.8 mA 1.8 mA -500 μA 500 μA

1. Disconnect all equipment from the output of the NI 4138.

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

a) If the internal device temperature exceeds Tcal ± 1 °C, wait up to 5 minutes for the

temperature to stabilize to within Tcal ± 1 °C.

b) If after 5 minutes the stable temperature still exceeds Tcal ± 1 °C, call the self-

calibration VI or function.

3. Take a current measurement using the NI 4138.

4. Record the value from the previous step.

5. Verify that the recorded value falls within the test limits.

6. If more than one limit range is specified, repeat the previous steps using the values

specified in each limit range.

Verifying 1 μA and 10 μA Current Measurement and Output

Compare a set of measured currents reported by the NI 4138 to the currents measured by an

external DMM.

Complete this procedure only after successfully completing all previous verification

procedures. Verify ranges in the specified order.

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

10 | ni.com | NI PXIe-4138 Calibration Procedure

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