Справочник Пользователя для National Instruments Welding System 321645c-01

Chapter 2

Function Reference — AI_VScale

NI-DAQ FRM for PC Compatibles

2-20

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 National Instruments Corporation

Converts the binary result from an 

AI_Read

 call to the actual input voltage.

 

 

chan is the onboard channel or AMUX channel on which NI-DAQ took the binary reading 
using 

AI_Read

. For devices other than the AT-MIO-16X, AT-MIO-64F-5, and E Series 

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 that you used to take the analog input reading. 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 that the DAQ device used. Refer to Appendix B, 

, for valid gain settings. Use of invalid gain settings 

causes NI-DAQ to return an error unless you are using SCXI. If you call 

AI_VScale

 for the 

516 and LPM devices or DAQCard-500/700, NI-DAQ ignores the gain unless you are using 
SCXI.

i16

assigned by configuration utility

i16

channel on which binary reading was taken

i16

gain setting used to take the reading

f64

multiplying factor to adjust gain

f64

binary offset present in reading

i16

result of the A/D conversion

f64

computed floating-point voltage