National Instruments USB-443 Series - Page 15

© National Instruments Corporation 15 NI USB-443x Calibration Procedure
8. Configure the calibrator to output 0 V.
Note The Fluke 5700A calibrator must be locked on the 2.2 V range when the output is set to 0 V.
Alternately, you can use a shorting cap instead of the calibrator in step 8 and step 9.
9. Enable the calibrator output.
10. Set the reference voltage to 0 VDC, and call the DAQmx Adjust DSA AI Calibration
Polymorphic VI as shown below.
11. Disable the calibrator output.
12. Finish the AI calibration with the DAQmx Close External Calibration VI as shown below. Use the
action
cancel if there has been any error during the AI calibration or if you do not want to save
the new AI calibration constants in the device EEPROM. Use the action commit to save the new
AI calibration constants in the device EEPROM.
The analog input of the device is now calibrated with respect to your external equipment. After
calibrating the device, verify the analog input operation by repeating the Analog Input Performance
Verification section.
LabVIEW Block Diagram NI-DAQmx Function Call
Call DAQmxAdjustDSAAICal with the following
parameters:
calHandle: myCalHandle
referenceVoltage: 0
inputsShorted: True
LabVIEW Block Diagram NI-DAQmx Function Call
Call DAQmxCloseExtCal with the following
parameters:
calHandle: myCalHandle
action: DAQmx_Val_Action_Commit or
DAQmx_Val_Action_Cancel