Keysight Technologies 8163A/B - Page 233

8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide 233
VISA Programming Examples 6
/*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);
/* first get the wavelength of the laser source; to
address the second channel of a dual laser source use "CHAN2"
instead of "CHAN1"*/
errStatus = viQueryf(vi,"%s","%f","SOURCE2:CHAN1:WAV?\
n",&wavelength);
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
else
{ printf("Source Wavelength:%g\n",wavelength); }
/* to receive the maximum power the attenuation must be
set to zero */
errStatus = viPrintf(vi,"SOURCE2:CHAN1:ATT 0\n");
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
/* turn off amplitude modulation */
errStatus = viPrintf(vi,"SOURCE2:CHAN1:AM:STATE 0\n");
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
/* turn the laser on */
errStatus = viPrintf(vi,"SOURCE2:CHAN1:POW:STATE 1\n");
if (errStatus < VI_SUCCESS) checkError(vi,errStatus);
/* loop, until a key is pressed */
while(!scanf("%c",&c));
/* turn the laser off */
errStatus = viPrintf(vi,"SOURCE2:CHAN1:POW:STATE 0\n");
if (errStatus < VI_SUCCESS) 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") ;