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National Instruments Corporation
7
SCXI-1125 Calibration Procedure
Complete the following steps to verify the accuracy of each SCXI-1125
analog input channel:
1.
Use the DAQmx Self Calibrate VI to verify the DAQ device. This VI
measures the onboard reference voltage of the DAQ device and adjusts
the self-calibration constants to account for any errors caused by
short-term fluctuations in the operating environment.
Note
Throughout the verification procedure, refer to the function call parameters for the
LabVIEW input values.
2.
Connect the calibrator output to pins AI- and AI+ for all channels.
Refer to the
SCXI-1320 High-Voltage Terminal Block Installation
Guide and Specifications
for connection instructions. If you are not
using the recommended SCXI-1320, refer to Table 4 for the front
signal pin assignments of the SCXI-1125. If the calibration signal
source is floating, connect AI- to the SCXI chassis ground using the
ground lug available on the SCXI terminal block.
3.
Set the calibrator voltage to the desired test point indicated in Table 2.
4.
Create a task using
DAQmxCreateTask
.
LabVIEW Block Diagram
NI-DAQmx Function Call
Call
DAQmxSelfCal
with the following
parameter:
deviceName
: "
Dev1
"
LabVIEW Block Diagram
NI-DAQmx Function Call
LabVIEW does not require this step.
Call
DAQmxCreateTask
with the following
parameters:
taskName
: "
AIVerificationTask
"
taskHandle
:
&taskHandle
