Agilent Technologies E4406A VSA Programming Examples, Saving Binary Trace Data in an ASCII File

Programming Examples

Saving Binary Trace Data in an ASCII File

ViSession defaultRM, viVSA; ViStatus viStatus= 0; char sBuffer[80]= {0}; FILE *fTraceFile;

long lNumberPoints= 0; long lNumberBytes= 0; long lLength= 0; long i = 0;

unsigned long lBytesRetrieved; ViReal64 adTraceArray[10240];

char *vsaSetup = /* setup commands for VSA */ "*RST;*CLS;"/* Reset the device and clear status */ ":FEED AREF;"/* set the input port to the internal

50MHz reference source*/

":DISP:FORM:ZOOM1;"/* zoom the spectrum display*/ ":FREQ:CENT 50E6;"/* tune the analyzer to 50MHz*/

":FORM REAL,64;"/* Set the ouput format to a binary format*/ ":FORM:BORD SWAP;"/* set the binary byte order to SWAP (for PC)*/ ":INIT:IMM;"/* trigger a spectrum measurement*/ ":FETC:SPEC7?";/* fetch the spectrum trace data*/

/*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 I/O timeout to five seconds */ viSetAttribute(viVSA,VI_ATTR_TMO_VALUE,5000);

/* Send setup commands to instrument */

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