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CALIBRATION PROCEDURE

NI 9225

3-Channel, 300 Vrms, 24-Bit, Simultaneous,
Channel-to-Channel Isolated Analog Input Module

This document contains the verification and adjustment procedures for the National Instruments
9225. For more information about calibration solutions, visit

ni.com/calibration

Contents

Accuracy Verification....................................................................................................... 5
Gain Matching Verification.............................................................................................. 6
Phase Matching Verification ............................................................................................ 8

Adjustment................................................................................................................................ 9

Accuracy Adjustment ....................................................................................................... 9

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.com/downloads

. NI-DAQmx supports

LabVIEW, LabWindows

™

/CVI

™

, ANSI C, and .NET. When you install NI-DAQmx, you only

need to install support for the application software that you intend to use.

ni.com/manuals

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Содержание 9225

Страница 1: ...cation 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 ni com downloads NI DAQmx sup...

Страница 2: ...ions and Specifications NI 9225 specific information specifications and calibration interval NI DAQmx Readme Operating system and application software support in NI DAQmx LabVIEW Help LabVIEW programming concepts and reference information about NI DAQmx VIs and functions NI DAQmx C Reference Help Reference information for NI DAQmx C functions and NI DAQmx C properties NI DAQmx NET Help Support for...

Страница 3: ... for all cable connections to the NI 9225 Use twisted pairs wire to eliminate noise and thermal offsets Maintain an ambient temperature of 23 C 5 C The NI 9225 temperature will be greater than the ambient temperature Keep relative humidity below 80 Allow a warm up time of at least 10 minutes to ensure that the NI 9225 measurement circuitry is at a stable operating temperature Table 1 Recommended E...

Страница 4: ...tem safety ground 4 Install the module in slot 8 of the NI cDAQ 9178 chassis Leave slots 1 through 7 of the NI cDAQ 9178 chassis empty 5 Connect the NI cDAQ 9178 chassis to your host computer 6 Connect the power source to the NI cDAQ 9178 chassis 7 Launch Measurement Automation Explorer MAX 8 Right click the device name and select Self Test to ensure that the module is working properly Verificatio...

Страница 5: ... to Operate mode OPR 5 Acquire and average samples a Create and configure an AI voltage task according to Table 2 b Configure the task timing according to Table 3 c Start the task d Read samples from the NI 9225 e Average the samples f Stop the task g Clear the task Table 2 NI 9225 AI Voltage Task Configuration for Phase Matching Physical Channels Minimum Vrms Maximum Vrms Terminal Configuration A...

Страница 6: ...tus of the NI 9225 1 Connect the NI 9225 to the function generator as shown in Figure 2 Figure 2 Gain Matching Verification Connections 2 Configure function generator according to Table 5 Table 4 NI 9225 Verification Test Limits for Accuracy Range Test Point 1 Year Limits Min Vrms Max Vrms Location Value VDC Lower Limit VDC Upper Limit VDC 300 300 Max 403 75 403 431250 404 068750 Mid 0 00 0 052275...

Страница 7: ...nnel using the AmplitudeAcq value 6 Compare the channel to channel gain difference to the maximum limit of 0 25 dB 7 Disable the function generator 8 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 Where to Go for Support for assistance in returning the device to NI Table 6 NI 9225 Configura...

Страница 8: ...ire samples a Create and configure an AI voltage task according to Table 9 b Configure the task timing according to Table 10 c Start the task d Read samples from the NI 9225 e Clear the task Table 8 Function Generator Configuration for Phase Matching Verification Signal Type Amplitude Vpk Sinewave 9 Table 9 NI 9225 Voltage Task Configuration for Phase Matching Verification Physical Channels Termin...

Страница 9: ...just the accuracy performance of the NI 9225 1 Set the calibrator to Standby mode STBY 2 Connect the NI 9225 to the calibrator as shown in Figure 1 3 Adjust the NI 9225 a Initialize a calibration session on the NI 9225 The default password is NI b Input the external temperature in degrees Celsius c Call the NI 9225 get C Series adjustment points function to obtain an array of recommended calibrati...

Страница 10: ...ils Reverification after performing an adjustment verify that you have met the Test Conditions before returning your device to NI Refer to Where to Go for Support for assistance in returning the device to NI Accuracy Under Calibration Conditions The values in the following table are based on calibrated scaling coefficients which are stored in the onboard EEPROM The following accuracy table is vali...

Страница 11: ...ebsite is your complete resource for technical support At ni com support you have access to everything from troubleshooting and application development self help resources to email and phone assistance from NI Application Engineers Visit ni com services for NI Factory Installation Services repairs extended warranty and other services Visit ni com register to register your National Instruments prod...

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