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140 Chapter 3
Programming Examples
Saving and Recalling Instrument State Data
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include "visa.h"
void main ()
{
/*program variables*/
ViSession defaultRM, viVSA;
ViStatus viStatus= 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);
}
/*set the instrument to basic mode*/
viPrintf(viVSA, "INST BASIC\n");
/*reset the instrument */
viPrintf(viVSA, "*RST\n");
/*set the input port to the internal 50Mhz reference source*/
viPrintf(viVSA, "SENS:FEED AREF\n");
/*zoom the spectrum display*/
viPrintf(viVSA, "DISP:FORM:ZOOM1\n");
/*tune the analyzer to 50MHZ*/
viPrintf(viVSA, "SENS:FREQ:CENT 50E6\n");
/*change the resolution bandwidth*/
viPrintf(viVSA, "SENS:SPEC:BAND:RES 100E3\n");
/*change the Y Axis Scale/Div*/
viPrintf(viVSA, "DISP:SPEC:WIND:TRAC:Y:SCAL:PDIV 5\n");
/*Change the display refernece level*/
viPrintf(viVSA, "DISP:SPEC:WIND:TRAC:Y:SCAL:RLEV -15\n");
/*trigger the instrument*/