How to Measure Power using FETCh and READ VISA Programming Examples
Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition 195
How to Measure Power using
FETCh and READ
The example shows the difference between a "FETCh" and a "READ"
command.
Install a power meter in Slot 1, before executing this example.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <visa.h>
/* function prototypes for this examples */
/* function for a simple error handling explained in example 1 */
void checkError(ViSession session, ViStatus err_status );
void main (void)
{
ViStatus errStatus; /* returned error code from visa call */
ViSession defaultRM; /* default visa resource manager
variable */
ViSession vi; /* current session handle */
ViChar replyBuf[256]; /* buffer holding answers of the
instrument*/
ViChar compBuf[256]; /* buffer used for comparsion */
ViChar c; /* used in the keyboard wait loop */
ViReal64 averagingTime; /* averaging time */
ViInt32 i; /* loop counter */
errStatus = viOpenDefaultRM (&defaultRM);
if(errStatus < VI_SUCCESS)
{
printf("Failed to open VISA Resource manager\n");
exit(errStatus);
}
errStatus = viOpen (defaultRM, "GPIB::20::INSTR",
VI_NULL,VI_NULL,&vi);
if(errStatus < VI_SUCCESS)
{
printf("Failed to open instrument\n");
exit(errStatus);
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