National Instruments PXIe-4468 Manual

PXIe-4468

September 2022

PXIe-4468

Calibration procedure

ni.com/services

PXIe-4468 Calibration Procedure

2ni.com/services

This document contains the verification and adjustment procedures for the

PXIe-4468 with either BNC or mini-XLR connectors. Use the procedures in this

document to automate calibration or to conduct manual calibration. Review

and become familiar with the entire procedure before beginning the

calibration process.

Contents

Terms and Definitions...............................................................................................3

Calibration Overview.................................................................................................4

Calibration Condition Guidelines .........................................................................5

Calibration Resources...............................................................................................5

Required Software.................................................................................................5

Recommended Documentation...........................................................................6

Test Equipment .....................................................................................................6

Warm Up the DUT......................................................................................................8

Perform Self-Calibration.......................................................................................8

Perform Verification..................................................................................................9

AI Offset Accuracy Verification..............................................................................9

AI Gain Accuracy Verification ..............................................................................12

AI Gain Flatness Verification ...............................................................................14

IEPE Current Verification.....................................................................................17

AO Differential Offset Accuracy Verification.......................................................19

AO Differential Gain Accuracy Verification.........................................................22

AO Gain Flatness Verification..............................................................................26

AO Common-Mode Gain and Offset Verification ...............................................29

Timebase Frequency Accuracy Verification.......................................................31

Perform Adjustment................................................................................................34

AI/AO Gain and Offset Adjustment .....................................................................34

Timebase Adjustment .........................................................................................35

Perform Reverification............................................................................................36

Update the Onboard Calibration Information.......................................................37

Revision History.......................................................................................................37

NI Services ...............................................................................................................38

PXIe-4468 Calibration Procedure

Terms and Definitions

DUT DUT is an acronym for Device Under Test and refers to the NI product

being calibrated. For this procedure, DUT refers to the PXIe-4468.

As-Found Limits These limits are derived from the published specifications for the DUT.

NI uses these limits to determine if the DUT is performing within the

recommended calibration interval specifications at the time of

calibration and before any adjustment is performed.

As-Left Limits These limits are derived from the published specifications for the DUT

minus guardband to ensure a high probability that the DUT will meet its

specifications over the next recommended calibration interval.

Functional Test Functional Tests determine whether the DUT is operating correctly.

Functional tests are not directly related to performance specifications.

Verification Verification evaluates the measured calibration results against the

defined As-Found Limits. The result of the evaluation is expressed as a

Pass/Fail condition in the calibration certificate using an established

evaluation formula.

Adjustment Adjustment performs a set of operations on the DUT to optimize the

measurement performance and conform it to the assigned calibrated

values.

Reverification Reverification evaluates the measured calibration results against the

As-Left limits after adjustment. The As-Left limits may be tighter than

the As-Found limits.

Recommended

Calibration Interval

This interval indicates the recommended period between each round of

verification and adjustment of the DUT. There is a high probability that,

within this interval, the DUT will remain within the published warranted

performance specifications. Some measurement DUTs have warranted

specifications for different calibration intervals, for example: 24 hours,

90 days, 1 year, and 2 years. In this case, the specification depends on

the calibration cycle chosen by the user.

PXIe-4468 Calibration Procedure

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Calibration Overview

Recommended Calibration Interval

2 years

Password

Note

This is the default password for all password-protected operations.

This password is site-specific.

Task Estimated Test

Time

Operator

Connections Test Points

Setup 10 minutes — —

Warm Up 15 minutes — —

Verify, Adjust, and

Reverify

19 minutes 36 344

Verify Only 8 minutes 17 171

Adjust Only 3 minutes 2 2

Note

Estimated test times assume the user is conducting a manual

calibration. For most procedures, automating the calibration

significantly reduces test times.

Environmental Conditions Verification Adjustment

Ambient temperature 23 °C ± 5 °C 23 °C ± 5 °C

Internal DUT temperature range Tcal ±5 °C Tcal ±5 °C

Relative humidity Between 20% and 80%, noncondensing

PXIe-4468 Calibration Procedure

Calibration Condition Guidelines

Keep cabling as short as possible. Long cables act as antennas, picking

up extra noise that can affect measurements.

Ensure that all connections to the DUT are secure.

Allow adequate warm up time for all components of the calibration

system.

Make all connections as shown in diagrams.

Use shielded copper wire for all cable connections to the DUT.

Use twisted-pair wires to eliminate noise and thermal offsets.

Ensure that the PXI/PXI Express chassis fan speed is set to HIGH, that the

fan filters are clean, and that the empty slots contain filler panels. For

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

document available at ni.com/manuals.

If a DUT fails reverification after adjustment, ensure that the Test

Conditions have been met before returning the DUT to NI.

If the coupling changes from DC to AC (for example, on the first gain

verification point tested), commit the configuration using the DAQmx

Control Task VI and wait 5 seconds for the input to settle. Subsequent

gain verification points, which do not change the coupling, do not

require a delay.

Calibration Resources

Required Software

Note

Ensure that the most recent version of the required driver software is

installed before conducting the calibration.

PXIe-4468 Calibration Procedure

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Install the following software on the calibration system:

DAQmx

Recommended Documentation

Go to ni.com/docs to locate the following documentation for more

information when performing this calibration:

PXIe-4468 Getting Started Guide

PXIe-4468 Specifications

NI-DAQmx Readme

NI-DAQmx Help

LabVIEW Help

NI-DAQmx C Reference Help

NI-DAQmx .NET Help Support for Visual Studio

Test Equipment

This section details the equipment NI recommends for each test performed

as part of this calibration procedure.

NI Calibration Executive Users

Refer to the Calibration Executive Help to find an updated list of test

equipment for this calibration procedure.

PXIe-4468 Calibration Procedure

Standard Recommended

Model Where Used Functional

Requirement(s)

Calibrator Fluke 5730A AI Gain

AI Flatness

Frequency Range:

40 Hz to 100 kHz

Voltage Range: up to

6.3 Vrms

Digital Multimeter

(DMM)

Keysight (Agilent)

3458A

AO Differential Offset

and Gain Adjustment

DC Voltage

Input Range: 100mV,

1 V, 10 V

AO Differential Gain

AO Differential

Flatness

AC Voltage

Input Range: 1 Vrms,

10 Vrms

Frequency Range:

20Hz to 100 kHz

Function Generator Keysight (Agilent)

33250A series

Timebase Frequency Frequency Range: up

to 90 kHz

PXI Express Chassis NI PXIe-1082

NI PXIe-1085

NI PXIe-1075

NI PXIe-1065

NI PXIe-1062Q

All Tests

System Controller NI PXIe-8135 All Tests A PXI Express

controller or MXI

Express Card

mXLR (F) to BNC (M)

Cable (quantity 1)

NI 140150-0R46 All Tests (mXLR

Variant)

Length: ≤ 0.5m

BNC (M) to BNC (M)

Cable (quantity 1)

Pomona Electronics

5697

All Tests (BNC

Variant)

Length: ≤ 0.5m

BNC (F) to Banana

Adapter (quantity 1)

Pomona Electronics

1269

AI Gain

AI Flatness

AO Offset

AO Gain

AO Flatness

AO Offset and Gain

Adjustment

PXIe-4468 Calibration Procedure

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Banana to Banana

Cable (quantity 1)

Pomona Electronics

B-4-2

AO Differential Gain

and Offset

Length: ≤ 0.5m

Banana to Alligator

Clip Cable (quantity 2)

Pomona Electronics

1166-12-0 (Black)

1166-12-2 (Red)

AO Differential Gain

and Offset

Length: ≤ 0.5m

Warm Up the DUT

Warm up time starts after the installed DUT is powered on in the chassis.

Warm up time resets after the DUT is removed from the chassis. This DUT

requires 15 minutes to warm up prior to conducting any tests.

Note

Observe adequate Warm up time for all components of the calibration

system.

Perform Self-Calibration

Self-calibration should be performed after the DUT has warmed up for the

recommended time period. This function measures the onboard reference

voltage of the DUT and adjusts the self-calibration constants to account for

any errors caused by short-term fluctuations in the environment.

Complete the following steps to conduct self-calibration using Measurement

& Automation Explorer (MAX).

Note

Disconnect all external signals before beginning self-calibration.

1. Launch MAX.

2. Select My System»Devices and Interfaces»NI PXIe-4468.

3. Start self-calibration using one of the following methods:

4. Click Self-Calibrate in the upper right corner of MAX.

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