HP 8163A Series Programming Manual page 141

How Power Varies with Wavelength
errStatus = viPrintf(vi,"SOURCE2:WAV %g\n",wavelength);
/*
poll the instrument for completion of this command
because adjusting a new wavelength takes some time
*/
do
{
errStatus = viQueryf(vi,"*OPC?\n","%d",&cmdDone);
checkError(vi,errStatus);
} while (!cmdDone);
}
/* loop, until a key is pressed */
while(!scanf("%c",&c));
/* turn laser off */
errStatus = viPrintf(vi,"SOURCE2:CHAN1:POW:STATE 0\n");
checkError(vi,errStatus);
/* close the session */
viClose(vi);
}
void checkError(ViSession session, ViStatus err_status )
{
ViStatus error;
ViChar errMsg[256];
error = viQueryf(session,"SYST:ERR?\n","%t",errMsg);
if (error == VI_ERROR_TMO) printf("System Error!\n") ;
else
{
/* only errors should be displayed */
if(errMsg[0] != '+')
printf("error:%ld --> %s\n", err_status,errMsg) ;
}
}
HP 8163A Lightwave Multimeter, HP 8164A Lightwave Measurement System,
& HP 8166A Lightwave Multichannel System User's Guide, E1299
Programming Examples
141