Agilent Technologies Model A.08.xx manual 118

Programming Examples

Reading Trace Data using ASCII Format (GPIB)

void main()

{

/*Program Variable*/ ViStatus viStatus = 0;

/*Dimension cResult to 13 bytes per sweep point, 8192 sweep points maximum*/ ViChar _VI_FAR cResult[106496] = {0};

FILE *fTraceFile; static ViChar *cToken ;

int iNum =0;

int iSwpPnts = 401; long lCount=0L; long lOpc=0;

/*iNum set to 13 times number of sweep points, 8192 sweep points maximum*/ iNum =106496;

lCount =0;

/* Open a GPIB session at address 18*/ viStatus=viOpenDefaultRM(&defaultRM); viStatus=viOpen(defaultRM,"GPIB0::18",VI_NULL,VI_NULL,&viESA); if(viStatus)

{

printf("Could not open a session to GPIB device at address 18!\n"); exit(0);

}

/* Clear the instrument */ viClear(viESA);

/*Reset the instrument. This will set number of sweep points to default of 401*/ viPrintf(viESA,"*RST\n");

/*Display the program heading */

printf("\n\t\t Read in Trace Data using ASCII Format (GPIB) Program \n\n" );

/* Check for the instrument model number and route the 50MHz signal accordingly*/ Route50MHzSignal();

/*Query number of sweep points per trace (firmware revision A.04.00 and later)*/ /*For firmware revisions prior to A.04.00, the number of sweep points is 401*/ iSwpPnts = 401;

viQueryf(viESA,"SENSE:SWEEP:POINTS?\n","%d",&iSwpPnts);

/*Set the analyzer center frequency to 50MHz*/ viPrintf(viESA,"SENS:FREQ:CENT 50 MHz\n");

/*Set the analyzer to 50MHz Span*/

118 Chapter 3