National Instruments 321645c-01 用户手册
Chapter 2
Function Reference — DAQ_VScale
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National Instruments Corporation
2-145
NI-DAQ FRM for PC Compatibles
DAQ_VScale
Format
status = DAQ_VScale (deviceNumber, chan, gain, gainAdjust, offset, count, binArray,
voltArray)
Purpose
Converts the values of an array of acquired binary data and the gain setting for that data to
actual input voltages measured.
actual input voltages measured.
Parameters
Input
Output
Parameter Discussion
chan is the onboard channel or AMUX channel on which the binary data was acquired. For
devices other than AT-MIO-16X, AT-MIO-64F-5, and E Series devices and DSA devices,
this parameter is ignored because the scaling calculation is the same for all of the channels.
However, you are encouraged to pass the correct channel number.
devices other than AT-MIO-16X, AT-MIO-64F-5, and E Series devices and DSA devices,
this parameter is ignored because the scaling calculation is the same for all of the channels.
However, you are encouraged to pass the correct channel number.
gain is the gain setting at which NI-DAQ acquired the data in binArray. If you used SCXI to
take the reading, this gain parameter should be the product of the gain on the SCXI module
channel and the gain used by the DAQ device.
take the reading, this gain parameter should be the product of the gain on the SCXI module
channel and the gain used by the DAQ device.
Name
Type
Description
deviceNumber
i16
assigned by configuration utility
chan
i16
channel on which binary reading was taken
gain
i16
gain setting
gainAdjust
f64
multiplying factor to adjust gain
offset
f64
binary offset present in reading
count
u32
length of binArray and voltArray
binArray
[i16]
acquired binary data
Name
Type
Description
voltArray
[f64]
double-precision values returned