National Instruments RM-26999 Handbuch

December 2020

RM-26999

Calibration Procedure

RM-26999 Calibration Procedure

This document contains the verification and adjustment procedures for the

RM-26999. 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 ......................................................................................................2

Calibration Overview........................................................................................................2

Calibration Condition Guidelines...............................................................................3

Calibration Resources ......................................................................................................4

Required Software.......................................................................................................4

Recommended Documentation.................................................................................5

Test Equipment ...........................................................................................................5

Initial Equipment Setup ...................................................................................................7

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

Perform Verification .........................................................................................................8

DC Gain Verification.....................................................................................................8

AC Gain Verification...................................................................................................12

Perform Adjustment.......................................................................................................17

Initial Test Connection..............................................................................................17

Adjustment Procedure..............................................................................................19

Perform Reverification ...................................................................................................22

Revision History..............................................................................................................22

NI Services.......................................................................................................................23

RM-26999 Calibration Procedure

2ni.com/calibration

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 RM-26999.

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.

Calibration Overview

Recommended Calibration Interval

1 year

RM-26999 Calibration Procedure

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 5 minutes 8 connections —

Warm Up 30 minutes — —

Verify, Adjust, and Reverify 35 minutes 28 connections 88 points

Verify only 15 minutes 8 connections 41 points

Adjust only 5 minutes 12 connections 6 points

Note

Estimated test times assume the user is conducting a manual calibration.

For most procedures, automating the calibration significantly reduces test

times.

Environmental Conditions for Calibration

Ambient temperature 23 °C ± 5 °C

Relative humidity 20% to 80%

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.

RM-26999 Calibration Procedure

4ni.com/calibration

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.

Allow the calibrator and DMM to settle fully before taking any measurements. NI

recommends a settling time of 10 seconds. Consult the calibrator and DMM user

documentation for more information.

Allow 2 minutes for the thermal EMF to stabilize after changing connections to

the calibrator, DMM, or DUT.

Calibration Resources

Required Software

Note

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

installed before conducting the calibration.

Install the following software on the calibration system:

LabVIEW 2017 SPI Base/Full/Pro or later

NI-DAQmx 17.0 or later

RM-26999 API from the VI Package Manager

RM-26999 Calibration Procedure

Recommended Documentation

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

when performing this calibration:

RM-26999 Specifications

RM-26999 Getting Started Guide

RM-26999 User Manual

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.

Standard Recommended Model Where Used Functional Requirement(s)

Calibrator Fluke 5730A

Verifications:

DC Gain

AC Gain

DC Range: ±1000 V

DC Accuracy: ±20 µV/V

AC Range: ±1000 V

AC Accuracy:

< 100 kHz: ±0.3%

< 1 MHz: ±1.5%

Calibrator Amp Fluke 5725A

Verifications:

AC Gain

AC Range: ±1000 V

AC Accuracy:

< 100 kHz: ±0.3%

< 1 MHz: ±1.5%

RM-26999 Calibration Procedure

6ni.com/calibration

DMM Keysight 3458A

Verifications:

DC Gain

AC Gain

DC Range: ±10 V

DC Accuracy: ±20 µV/V

AC Range: ±10 V

AC Accuracy: <1 MHz: ±0.02%

Low Thermal EMF

Cable with

Banana Plugs

Fluke 5730A-7002

Verifications:

DC Gain

AC Gain

—

BNC (f) to Banana

Plug Adaptor Pomona Model 1269

Verifications:

DC Gain

AC Gain

—

Power Supply NI PS-16

Verifications:

DC Gain

AC Gain

24 V DC, 5 A

BNC (f) to BNC (f)

cable

Verifications:

DC Gain

AC Gain

—

Calibrator Amp

Cable Fluke 842901

Verifications:

AC Gain No substitution.

SMIO (DAQ)

Module

PXIe-6356, PXIe-6358,

PXIe-6366, PXIe-6368,

PXIe-6376, or PXIe-6378

Verifications:

DC Gain

AC Gain

—

DAQ Device Cable NI SH68F-68F-EPM — —

RM-26999 Calibration Procedure

Initial Equipment Setup

1. Verify that the calibrator has been calibrated within 1 year and that DC Zero

Calibration has been performed within the last 30 days.

Note

Consult the calibrator user documentation for calibration instructions.

2. Verify that the DMM has been calibrated within 1 year. Verify that ACAL (self-

calibration) has been performed within the last 24 hours or when the

temperature drifts more than ±1 °C from last ACAL temperature. The DMM

must also be within ±5 °C from TCAL. TCAL is the temperature at which an

external calibration was performed on the DMM.

Note

Conducting ACAL on the DMM provides additional c

orrection for errors that

result from measurement, such as temperature drift. Refer to the DMM

user

documentation for more information on conducting ACAL. Account for

additional uncertainty if ACAL is not performed correctly or if TCAL

is outside

the bounds of

3. Verify that the calibrator and DMM have warmed up for at least 1 hour before

making any measurements for this procedure.

4. Allow the calibrator and DMM to settle before taking any measurements.

Note

NI recommends a settling time of 10 seconds. Refer to the calibrator and

DMM documentation for more information about manufacturer-

recommended settling times.

5. Clean any oxidation from the banana connectors on the cables before

connecting them to the calibrator, DMM or DUT.

Note

Oxidation tarnishes the copper plugs so that they appear dull rather than

shiny and increases thermal EMF.

RM-26999 Calibration Procedure

8ni.com/calibration

Warm Up the DUT

Warm up time is not required for the DUT prior to taking measurements. All test

equipment used in this procedure require a warm up time of at least 1 hour.

Perform Verification

DC Gain Verification

Test Limits

Table 1: DC Gain Verification Test Limits

High Voltage

Input Value

Low Voltage

Input Value

Calibrator

Range DMM Range

As-Found Test Limit As-Left Test Limit

Lower

Limit

Upper

Limit

Lower

Limit

Upper

Limit

1000 V 5 V 1100 V 10 V - 502 mV + 502 mV - 251 mV + 251 mV

750 V 3.75 V 1100 V 10 V - 377 mV + 377 mV - 189 mV + 189 mV

500 V 2.5 V 1100 V 10 V - 252 mV + 252 mV - 126 mV + 126 mV

200 V 1 V 220 V 1 V - 102 mV + 102 mV - 51 mV + 51 mV

100 V 500 mV 220 V 1 V - 52 mV + 52 mV - 26 mV + 26 mV

10 V 50 mV 11 V 0.1 V - 7 mV + 7 mV - 3 mV + 3 mV

0 V 5 mV 11 V 0.1 V - 2 mV + 2 mV - 1 mV + 1 mV

-10 V 50 mV 11 V 0.1 V - 7 mV + 7 mV - 3 mV + 3 mV

-100 V 500 mV 220 V 1 V - 52 mV + 52 mV - 26 mV + 26 mV

-200 V 1 V 220 V 1 V - 102 mV + 102 mV - 51 mV + 51 mV

-500 V 2.5 V 1100 V 10 V - 252 mV + 252 mV - 126 mV + 126 mV

-750 V 3.75 V 1100 V 10 V - 377 mV + 377 mV - 189 mV + 189 mV

-1000 V 5 V 1100 V 10 V - 502 mV + 502 mV - 251 mV + 251 mV

RM-26999 Calibration Procedure

Initial Test Connection

Caution: Possibility of Electric Shock

Power off all high-voltage signals before making any connections.

Figure 1: DC Gain Connection

Calibrator

BNC

-2090A

Low

thermal EMF cable with banana plugs

PXIe

-6356

-26999

SH68F

-68F-EPM cable

Power supply

10.

BNC cable

Twisted, shielded power cable

11.

BNC to

banana plug adaptor

SH68F

-68F-EPM cable

12.

DMM

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