NI 446X Calibration Procedure 12 ni.com
Verifying AI DC Offset
Complete the following steps to verify the AI DC offset:
1. Connect a 50 Ω terminator to the analog input channel 0 of the device.
The terminator grounds the input channel when it is in
pseudodifferential configuration.
2. If you use C function calls, create a task using the following function.
If you use LabVIEW, skip this step. The task is created in step 3 in
LabVIEW.
You use the object
myTaskHandle in all subsequent NI-DAQmx
function calls.
3. Create an AI voltage channel through NI-DAQmx using the following
function.
NI-DAQmx Function Call LabVIEW Block Diagram
Call DAQmxCreateTask with the following
parameter:
taskHandle:
mytaskHandleReturnValue
LabVIEW does not require this step.
NI-DAQmx Function Call LabVIEW Block Diagram
Call DAQmxCreateAIVoltageChan with the
following parameters:
taskHandle:
myTaskHandle
physicalChannel: dev1/ai0
nameToAssignToChannel: ""
terminalConfig: DAQmx_Val_PseudoDiff
minVal: -10.0
maxVal: 10.0
units: DAQmx_Val_Volts
CustomScaleName: NULL
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