National Instruments NI 9227 Calibration Procedure
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National Instruments NI 9227 Calibration Procedure

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CALIBRATION PROCEDURE
NI 9227
This document contains the verification and adjustment procedures for the National
Instruments 9227. For more information about calibration solutions, visit
.
calibration
Contents
Software.................................................................................................................................... 1
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 3
Test Conditions......................................................................................................................... 3
Initial Setup............................................................................................................................... 4
Verification ............................................................................................................................... 4
Accuracy Verification....................................................................................................... 5
Gain Matching Verification.............................................................................................. 6
Phase Matching Verification ............................................................................................ 8
Adjustment................................................................................................................................ 9
Accuracy Adjustment ....................................................................................................... 9
EEPROM Update ..................................................................................................................... 10
Reverification ........................................................................................................................... 10
Accuracy Under Calibration Conditions .................................................................................. 10
Worldwide Support and Services ............................................................................................. 11

Software

Calibrating the NI 9227 requires the installation of NI-DAQmx 9.3 or later on the calibration
system. You can download NI-DAQmx from
LabVIEW, LabWindows
NI-DAQmx, you only need to install support for the application software that you intend to use.
™
™
/CVI
, C/C++, C#, and Visual Basic .NET. When you install
ni.com/downloads
ni.com/
. NI-DAQmx supports

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  • Page 1: Table Of Contents

    Reverification ........................... 10 Accuracy Under Calibration Conditions .................. 10 Worldwide Support and Services ..................... 11 Software Calibrating the NI 9227 requires the installation of NI-DAQmx 9.3 or later on the calibration system. You can download NI-DAQmx from . NI-DAQmx supports ni.com/downloads ™...

  • Page 2: Documentation

    Documentation Consult the following documents for information about the NI 9227, 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

    • Keep relative humidity below 80%. • Allow a warm-up time of at least 10 minutes to ensure that the NI 9227 measurement circuitry is at a stable operating temperature. NI 9227 Calibration Procedure | © National Instruments | 3...

  • Page 4: Initial Setup

    Verification The following performance verification procedures describes the sequence of operation and test points required to verify the NI 9227 and assumes that adequate traceable uncertainties are available for the calibration references. 4 | ni.com | NI 9227 Calibration Procedure...

  • Page 5: Accuracy Verification

    Accuracy Verification Complete the following procedure to determine the As-Found status of the NI 9227. Completing the Accuracy verification procedure verifies both the 5 A Note 10 A accuracy specifications listed the NI 9227 Operating Instructions and Specifications. Set the calibrator to Standby mode (STBY).

  • Page 6: Gain Matching Verification

    The test limits listed in Table 4 are derived using the values in Table 13. Note Gain Matching Verification Complete the following procedure to determine the As-Found status of the NI 9227. Connect the NI 9227 to the function generator as shown in Figure 2. Figure 2. Gain Matching Verification Connections 50 Ω...
  • Page 7 Compare the channel-to-channel gain difference to the maximum limit of ±0.13 dB. Disable the function generator. Disconnect the calibrator from the device. If the Gain Matching verification procedure determines that the NI 9227 is outside of the limits, refer to Worldwide Support and Services for assistance in returning the device to NI.

  • Page 8: Phase Matching Verification

    Phase Matching Verification Complete the following procedure to determine the As-Found status of the NI 9227. Connect the NI 9227 to the function generator as shown in Figure 3. Figure 3. Phase Matching Verification Connections 50 Ω 50 Ω –...

  • Page 9: Adjustment

    ±2.000° Disable the function generator. 10. Disconnect the function generator from the device. If the Phase Matching verification procedure determines that the NI 9227 is outside of the limits, refer to Worldwide Support and Services for assistance in returning the device to NI.

  • Page 10: Eeprom Update

    Set the calibrator to Operate mode (OPR). Call and configure the NI 9227 adjustment function according to Table 12. Table 12. Adjustment Configuration Physical Channel Reference Value cDAQMod8/aix The actual value of the current output of the calibrator Set the calibrator to Standby mode (STBY).

  • Page 11: 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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