© National Instruments Corporation 27 NI 446X Calibration Procedure
9. Configure the onboard memory of the device using the following
function and the array modified in step 3.
10. Start the task using the following function.
11. Measure the DC voltage of the analog output channel using the
multimeter in the appropriate range. Compare this value to the
limits (V) in Table 5 for – 40 dB device gain
.
NI-DAQmx Function Call LabVIEW Block Diagram
Call DAQmxWriteAnalogF64 with the
following parameters:
taskHandle:
myTaskHandle
numSampsPerChan: 1024
autoStart: FALSE
timeout: 10.0
dataLayout:
DAQmx_Val_GroupByChannel
writeArray: myDataArray
reserved: NULL
sampsPerChanWritten:
int32PointerReturnValue
NI-DAQmx Function Call LabVIEW Block Diagram
Call DAQmxStartTask with the following
parameters:
taskHandle:
myTaskHandle
Table 5. AO Gain Accuracy Limits
Device Gain
Device Output
Amplitude
(VDC)
Output Amplitude Accuracy
Min (dB) Max (dB) Min (V) Max (V)
– 40 0.09 – 0.04 0.04 0.089587 0.090415
–20 0.9 – 0.04 0.04 0.89587 0.90415
0 9.0 – 0.04 0.04 8.9587 9.0415
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