National Instruments NI 4495, Процедура калибровки, Страница: 18 / 22

NI 449
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Calibration Procedure | © National Instruments | 17
5. 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
if you want to save the new AI calibration constants in the device EEPROM.
The device is now calibrated with respect to your external source. After calibrating the device,
verify the analog input operation by repeating the
Verification section using the after adjustment
values found in Tables 3, 4, 7, and 15, and the values found in Table 14.
Analog Input Adjustment for NI 4492/4497/4499 Devices
Complete the following steps to calibrate the analog input of an NI 4492/4497/4499 device:
1. Connect the output of the calibrator to all input channels on the device, using the BNC
T-connectors to split the signal in a tree formation to all the inputs.
2. Initialize the AI calibration using the DAQmx Initialize External Calibration VI, as shown
below.
Note Refer to the NI-DAQmx function parameters for the LabVIEW input values.
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
LabVIEW Block Diagram NI-DAQmx Function Call
Call
DAQmxInitExtCal
with the
following parameters:
deviceName :
Dev_name
password :
NI
calHandle :
&myCalHandle