HP 8163A Series Programming Manual page 140

Programming Examples
checkError(vi,errStatus);
/*save this wavelength */
wavelength_max = atof(replyBuf);
/* change the power unit of the power meter to dbm */
errStatus = viPrintf(vi,"SENS1:CHAN1:POW:UNIT DBM\n");
checkError(vi,errStatus);
/* read the default power from the tunable laser source */
errStatus = viQueryf(vi,"SOURCE2:POW? DEF\n","%s",replyBuf);
checkError(vi,errStatus);
/* set the default power */
errStatus = viPrintf(vi,"SOURCE2:POW %s\n",replyBuf);
checkError(vi,errStatus);
/* turn auto range on*/
errStatus = viPrintf(vi,"SENS1:CHAN1:POW:RANGE:AUTO 1\n");
checkError(vi,errStatus);
/*set the averaging time for measuring to 20ms*/
errStatus = viPrintf(vi,"SENS1:CHAN1:POW:ATIME 0.02\n");
checkError(vi,errStatus);
/* turn laser on */
errStatus = viPrintf(vi,"SOURCE2:POW:STATE 1\n");
checkError(vi,errStatus);
/* increase the wavelength of the tunable laser source 10 nm
until the maximum is reached.
read the results from the power meter and display it */
for(i=1;1;i++)
{
/*query the power */
errStatus = viQueryf(vi,"READ1:CHAN1:POW?\n","%s",replyBuf);
checkError(vi,errStatus);
/* display the power read from power meter and wavelength */
printf("#%02d power:%s wavelength:%g\n",i,replyBuf,wavelength);
/* increase the wavelength */
wavelength += 10.0e-9;
if(wavelength > wavelength_max) break;
/*set the new wavelength*/
140
HP 8163A Lightwave Multimeter, HP 8164A Lightwave Measurement System,
& HP 8166A Lightwave Multichannel System User's Guide, E1299
How Power Varies with Wavelength