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NI 9225 Calibration Procedure

Initial Setup

Complete the following steps to set up the NI 9225.

1.

Install NI-DAQmx.

2.

Make sure the NI cDAQ-9178 power source is not connected.

3.

Connect the NI cDAQ-9178 to the system safety ground.

a.

Attach a ring lug to a 14 AWG (1.6 mm) wire.

b.

Connect the ring lug to the ground terminal on the side of the NI cDAQ-9178 using 
the ground screw.

c.

Attach the other end of the wire to the system 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.

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.

Summary of Contents for NI 9225

Page 1: ...NI 9225...

Page 2: ...ation 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 1...

Page 3: ...ons 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 programmi...

Page 4: ...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 ambi...

Page 5: ...em 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...

Page 6: ...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 t...

Page 7: ...us 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 92...

Page 8: ...nel 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 I...

Page 9: ...re 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 Fu...

Page 10: ...ust 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 sessi...

Page 11: ...ls 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...

Page 12: ...bsite 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...

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