NI 9234 User Manual

CALIBRATION PROCEDURE
NI 9234
4-Channel, ±5 V, 24-Bit Software-Selectable
IEPE and AC/DC Analog Input Module
This document contains the verification and adjustment procedures for the National
Instruments 9234. For more information on calibration, visit
ni.com/calibration.
Contents
Software.................................................................................................................................... 1
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 3
Test Conditions......................................................................................................................... 4
Initial Setup............................................................................................................................... 4
Verification............................................................................................................................... 5
Accuracy Verification....................................................................................................... 5
Gain Matching Verification.............................................................................................. 6
Phase Matching Verification ............................................................................................ 8
Common-Mode Rejection Ratio Verification .................................................................. 9
IEPE Current Verification ................................................................................................ 11
IEPE Compliance Voltage Verification ........................................................................... 12
Adjustment................................................................................................................................ 14
Accuracy Adjustment ....................................................................................................... 14
EEPROM Update ..................................................................................................................... 14
Reverification ........................................................................................................................... 15
Accuracy Under Calibration Conditions .................................................................................. 15
Worldwide Support and Services ............................................................................................. 16
Software
Calibrating the NI 9234 requires the installation of NI-DAQmx 9.2 or later on the calibration
system. You can download NI-DAQmx from ni.com/downloads. NI-DAQmx supports
LabVIEW, LabWindows
TM
/CVI, C/C++, C#, and Visual Basic .NET. When you install
NI-DAQmx you only need to install support for the ADE that you intend to use.

NI 9234 Specifications

General

Number of Channels	4
Simultaneous Sampling	Yes
Maximum Sample Rate	51.2 kS/s per channel
Resolution	24 bits
Input Range	±5 V
Operating Temperature Range	-40 °C to 70 °C
Signal Conditioning	IEPE
Isolation	Channel-to-earth ground

Summary

Software Requirements

Related Documentation

Test Equipment List

Test Setup Conditions

Initial Setup Procedure

Verification Procedures

Accuracy Verification

Procedure to determine the As-Found status of the NI 9234 accuracy.

Gain Matching Verification

Procedure to determine the As-Found status of the NI 9234 gain matching.

Phase Matching Verification

Procedure to determine the As-Found status of the NI 9234 phase matching.

Common-Mode Rejection Ratio Verification

Procedure to determine the As-Found status of the NI 9234 CMRR.

IEPE Current Verification

Procedure to determine the As-Found status of the NI 9234 IEPE current.

IEPE Compliance Voltage Verification

Procedure to determine the As-Found status of the NI 9234 IEPE compliance voltage.

Adjustment Procedures

Accuracy Adjustment

Procedure to adjust the accuracy performance of the NI 9234.

EEPROM Update

Update the NI 9234 internal calibration memory (EEPROM).

Reverification

Accuracy Under Calibration Conditions

Specifies calibration conditions for accuracy measurements.

Worldwide Support and Services