128 Chapter3
Programming Examples
Using Markers
Example:
#include <stdio.h>
#include <stdlib.h>
#include <stdmath.h>
#include "visa.h"
void main ()
{
/*program variables*/
ViSession defaultRM, viVSA;
ViStatus viStatus = 0;
double dPeakPower = 0;
double dNoiseMarker = 0;
double dResult= 0;
long lComplete = 0;
/*open session to GPIB device at address 18 */
viStatus=viOpenDefaultRM (&defaultRM);
viStatus=viOpen (defaultRM, "GPIB0::18::INSTR",
VI_NULL,VI_NULL, &viVSA);
/*check opening session sucess*/
if(viStatus)
{
printf("Could not open a session to GPIB device at
address 18!\n");
exit(0);
}
/*reset the instrument */
viPrintf(viVSA, "*RST\n");
/*set the input port to the internal 50Mhz reference
source*/
viPrintf(viVSA, "SENS:FEED AREF\n");
/*tune the instrument to 50MHZ*/
viPrintf(viVSA, "SENS:FREQ:CENT 50E6\n");
/*put the instrument in single measurement mode*/
viPrintf(viVSA, "INIT:CONT 0\n");
/*zoom the spectrum display*/
viPrintf(viVSA, "DISP:FORM:ZOOM1\n");
/*trigger a spectrum measurement*/
viPrintf(viVSA, "INIT:IMM;*OPC?\n");
/*poll the operation complete query*/
while (!lComplete)
viScanf (viVSA,"%d",&lComplete);
/*assign marker 1 to the average trace of the spectrum*/
viPrintf(viVSA, "CALC:SPEC:MARK1:TRAC ASP\n");
/*put the marker 1 on the signal peak*/
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