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CALIBRATION PROCEDURE
NI 9225
3-Channel, 300 Vrms, 24-Bit, Simultaneous,
Channel-to-Channel Isolated Analog Input Module
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This document contains the verification and adjustment procedures for the National Instruments
9225. For more information about calibration solutions, visit
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
Where to Go for Support .......................................................................................................... 11
Software
Calibrating the NI 9225 requires the installation of NI-DAQmx 9.3 or later on the calibration
system. You can download NI-DAQmx from
LabVIEW, LabWindows
need to install support for the application software that you intend to use.
Deutsch
ni.com/manuals
™
/CVI
™
, ANSI C, and .NET. When you install NI-DAQmx, you only
ni.com/calibration
ni.com/downloads
.
. NI-DAQmx supports
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Table of Contents
Related Manuals for National Instruments 9225
Summary of Contents for National Instruments 9225
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Page 1: Table Of Contents
Reverification ........................... 10 Accuracy Under Calibration Conditions .................. 10 Where to Go for Support ......................11 Software Calibrating the NI 9225 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 LabVIEW, LabWindows ™... -
Page 2: Documentation
Documentation Consult the following documents for information about the NI 9225, NI-DAQmx, and your application software. All documents are available on and help files install with the ni.com software. NI cDAQ-9174/9178 Quick Start Guide NI-DAQmx installation and hardware setup NI 9225 Operating Instructions and Specifications... -
Page 3: Test Equipment
The following setup and environmental conditions are required to ensure the NI 9225 meets published specifications. • Keep connections to the NI 9225 as short as possible. Long cables and wires act as antennas, picking up extra noise that can affect measurements. •... -
Page 4: Initial Setup
Verification The following performance verification procedures describe the sequence of operation and test points required to verify the NI 9225 and assumes that adequate traceable uncertainties are available for the calibration references. 4 | ni.com | NI 9225 Calibration Procedure... -
Page 5: Accuracy Verification
Accuracy Verification Complete the following procedure to determine the As-Found status of the NI 9225. Set the calibrator to Standby mode (STBY). Connect the NI 9225 to the calibrator as shown in Figure 1. Figure 1. Accuracy Verification Connections –... -
Page 6: Gain Matching Verification
The test limits listed in Table 4 are derived using the values in Table 17. Note Gain Matching Verification Complete the following procedure to determine the As-Found status of the NI 9225. Connect the NI 9225 to the function generator as shown in Figure 2. Figure 2. Gain Matching Verification Connections –... - Page 7 Compare the channel-to-channel gain difference to the maximum limit of ±0.25 dB. Disable the function generator. Disconnect the function generator from the device. If the Gain Matching verification procedure determines that the NI 9225 is outside of the limits, refer to for assistance in returning the device to NI.
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Page 8: Phase Matching Verification
Phase Matching Verification Complete the following procedure to determine the As-Found status of the NI 9225. Connect the NI 9225 to the function generator as shown in Figure 3. Figure 3. Phase Matching Verification Connections – Function Generator – –... -
Page 9: Adjustment
±0.700° Disable the function generator. 10. Disconnect the function generator from the device. If the Phase Matching verification procedure determines that the NI 9225 is outside of the limits, refer to for assistance in returning the device to NI. Where to Go for Support... -
Page 10: Eeprom Update
Disconnect the NI 9225 from the calibrator. EEPROM Update When an adjustment procedure is completed, the NI 9225 internal calibration memory (EEPROM) is immediately updated. If you do not want to perform an adjustment, you can update the calibration date and onboard calibration temperature without making any adjustments by initializing an external calibration, setting the C Series calibration temperature, and closing the external calibration. -
Page 11: Where To Go For Support
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.