NI 9234 Calibration Manual
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NI 9234 Calibration Manual

4-channel, ±5 v, 24-bit software-selectable iepe and ac/dc analog input module
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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
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
LabVIEW, LabWindows
NI-DAQmx you only need to install support for the ADE that you intend to use.
/CVI, C/C++, C#, and Visual Basic .NET. When you install
TM
ni.com/calibration
ni.com/downloads
.
. NI-DAQmx supports

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  • Page 1: Table Of Contents

    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-DAQmx supports ni.com/downloads LabVIEW, LabWindows /CVI, C/C++, C#, and Visual Basic .NET.

  • Page 2: Documentation

    Documentation Consult the following documents for information about the NI 9234, NI-DAQmx, and your application software. All documents are available on and help files install with the ni.com software. NI cDAQ-9174/9178 USB Chassis Quick Start NI-DAQmx installation and hardware setup...

  • Page 3: Test Equipment

    Measure 2400 Compliance DC with an accuracy ≤0.1% while Unit (SMU) Voltage sinking >2 mA DC. BNC Cable — Use a length appropriate for your application. Chassis NI cDAQ-9178 — NI 9234 Calibration Procedure | © National Instruments | 3...

  • Page 4: Test Conditions

    Attach the other end of the wire to the system safety ground. Install the module in slot 8 of the NI cDAQ-9178 chassis. Leave slots 1 through 7 of the NI cDAQ-9178 chassis empty. Connect the NI cDAQ-9178 chassis to your host computer.

  • Page 5: Verification

    Verification The following performance verification procedures describe the sequence of operation and test points required to verify the NI 9234 and assumes that adequate traceable uncertainties are available for the calibration references. Accuracy Verification Complete the following procedure to determine the As-Found status of the NI 9234.

  • Page 6: Gain Matching Verification

    Complete the following procedure to determine the As-Found status of the NI 9234. Set the calibrator to Standby mode (STBY). Connect the NI 9234 to the calibrator. Refer to Figure 2 for a connection diagram. Figure 2. Gain Matching Verification Connections to the NI 9234 –...
  • Page 7 10. Repeat steps 1 through 9 for each channel. 11. Compare the channel-to-channel gain difference to the maximum limit of ±40 mdB. If the Gain Matching verification procedure determines that the NI 9234 is outside of the limits, Worldwide Support and Services refer to for assistance in returning the device to NI.

  • Page 8: Phase Matching Verification

    Scaled Units Channel Configuration Volts AC Coupled Wait 20 s for the AC coupling filter on the NI 9234 to settle. Note Configure the AI voltage task timing according to Table 9. Table 9. NI 9234 Timing Configuration Sample Mode...

  • Page 9: Common-Mode Rejection Ratio Verification

    Generator Frequency (kHz) Phase Matching Channel-to-Channel Limit ±0.085° ±0.49° If the Phase Matching verification procedure determines that the NI 9234 is outside of the limits, Worldwide Support and Services refer to for assistance in returning the device to NI. Common-Mode Rejection Ratio Verification Complete the following procedure to determine the As-Found status of the NI 9234.
  • Page 10 Acquire a reference amplitude. Create and configure an AI voltage task on the NI 9234 according to Table 12. Table 12. NI 9234 Configuration for CMRR Verification Min (V) Max (V) Scaled Units Channel Configuration Volts DC Coupled Configure the AI voltage task timing according to Table 13.

  • Page 11: Iepe Current Verification

    Compare the DMM measurement to the minimum current limit of 2.0 mA. Repeat steps 1 through 4 for each channel. If the IEPE Current verification procedure determines that the NI 9234 is outside of the limits, Worldwide Support and Services refer to for assistance in returning the device to NI.

  • Page 12: Iepe Compliance Voltage Verification

    IEPE Compliance Voltage Verification Complete the following procedure to determine the As-Found status of the NI 9234. Connect the NI 9234 to the DMM as shown in Figure 6. Figure 6. IEPE Compliance Voltage Verification Connections to the NI 9234 (IEPE Source Short Circuit Current Measurement) –...
  • Page 13 Connect the SMU to the channel you want to verify on the NI 9234. Refer to Figure 7 for a connection diagram. Figure 7. IEPE Compliance Voltage Verification Connections to the NI 9234 (IEPE Source Compliance Voltage Measurement) – NI 9234 Configure the SMU as a current source and set the voltage limit to the lowest appropriate range to measure 24 V.

  • Page 14: Adjustment

    Initialize a calibration session on the NI 9234. The default password is Input the external temperature in degrees Celsius. Call the NI 9234 get C Series adjustment points function to obtain an array of recommended calibration voltages for the NI 9234.

  • Page 15: Reverification

    • Ambient temperature 23 ±5 °C • NI 9234 installed in slot 8 of an NI cDAQ-9178 chassis • Slots 1 through 7 of the NI cDAQ-9178 chassis are empty The test limits listed in Table 4 are derived using the values in Table 21.

  • Page 16: Worldwide Support And Services

    NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance for the National Instruments global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS.

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