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8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide
6
VISA Programming Examples
How Power Varies with Wavelength
This example shows how the measured power depends on wavelength.
Install a Power Sensor in Slot 1 and a Tunable Laser Source in Slot 2 and
connect the Tunable Laser Source output to the Power Sensor input,
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 c; /* used in the keyboard wait
loop */
ViReal64 wavelength; /* used to hold the wavelength
of the tunable laser source */
ViReal64 wavelength_max; /*used to hold the maximum
wavelength of the tunable laser source*/
ViInt32 i; /* loop counter */
ViInt32 cmdDone; /* return value for OPC command
*/
errStatus = viOpenDefaultRM (&defaultRM);
if(errStatus < VI_SUCCESS)
{
printf("Failed to open VISA Resource manager\n");
exit(errStatus);
}
