Agilent Technologies 8163A Programming Manual page 140

VISA Programming Examples
void checkError(ViSession session, ViStatus err_status );
void main (void)
{
ViStatus
ViSession
ViSession
ViChar
ViChar
ViChar
ViReal64 averagingTime; /* averaging time */
ViInt32 i;
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);
}
/*set timeout to 20 sec; this should work for all commands
except zeroing */
errStatus = viSetAttribute(vi,VI_ATTR_TMO_VALUE,20000);
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
/* make sure that the reference is not used */
errStatus = viPrintf(vi,"SENS1:CHAN1:POW:REF:STATE 0\n");
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
/* clear the error queue */
errStatus = viPrintf(vi,"*CLS\n");
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
/* turn auto range on */
errStatus = viPrintf(vi,"SENS1:CHAN1:POW:RANGE:AUTO 1\n");
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
/* change the power unit to watt */
140
errStatus; /* returned error code from visa call */
defaultRM; /* default visa resource manager variable */
vi; /* current session handle */
replyBuf[256]; /* buffer holding answers of the instrument*/
compBuf[256]; /* buffer used for comparsion */
c; /* used in the keyboard wait loop */
/* loop counter */
Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System,
& Agilent 8166A Lightwave Multichannel System, Third Edition
How to Measure Power using FETCh and READ