National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — DAQ_to_Disk

NI-DAQ FRM for PC Compatibles

2-142

©

 National Instruments Corporation

Performs a synchronous, single-channel DAQ operation and saves the acquired data in a disk 
file. 

DAQ_to_Disk

 does not return until NI-DAQ has acquired and saved all the data or an 

acquisition error has occurred.

chan is the analog input channel number. If you are using SCXI, you must use the appropriate 
analog input channel on the DAQ device that corresponds to the SCXI channel you want. 
Select the SCXI channel using 

SCXI_Single_Chan_Setup

before calling this function. Refer to the NI-DAQ User Manual for PC Compatibles for more 
information on SCXI channel assignments.

Range:

See Table B-1 in Appendix B, 

.

gain is the gain setting to be used for that channel. This gain setting applies only to the DAQ 
device; if SCXI is used, you must establish any gain at the SCXI module either by setting 
jumpers on the module or by calling 

SCXI_Set_Gain

. Refer to Appendix B, 

, for valid gain settings. If you use invalid 

gain settings, NI-DAQ returns an error. NI-DAQ ignores gain for 516 and LPM devices and 
the DAQCard-500/700.

i16

assigned by configuration utility

i16

analog input channel number

i16

gain setting

STR

name of data file to be created

u32

number of samples to be acquired

f64

rate in units of pts/s

i16

enables concatenation to an existing file