Agilent Technologies Model A.08.xx manual

Programming Examples

Reading Trace Data Using 32-bit Real Format (RS-232)

/*Query number of sweep points per trace (firmware revision A.04.00 or 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);

/*Calculate number of bytes in the header. The header consists of the "#" sign*/ /*followed by a digit representing the number of digits to follow. The digits */ /*which follow represent the number of sweep points multiplied by the number */

/*of bytes per point. */
iHeaderBytes = 3;	/*iDataBytes >0, plus increment for "#" and "n" */
iDataBytes = (iSwpPnts*iBytesPerPnt);
lNumberBytes = iDataBytes;
while ((iDataBytes = (iDataBytes / 10		)) > 0 )
{
iHeaderBytes++;
}

/*Set analyzer to single sweep mode */ viPrintf(viESA,"INIT:CONT 0 \n");

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

/*Set the analyzer to 50MHz Span */ viPrintf(viESA,"SENS:FREQ:SPAN 50 MHZ\n");

/* Specify dB per division of each vertical division & Units */ viPrintf(viESA,"DISP:WIND:TRAC:Y:SCAL:PDIV 10dB\n"); viPrintf(viESA,"UNIT:POW DBM\n");

/*Set analyzer trace data format to 32-bit Real */ viPrintf(viESA,"FORM:DATA REAL,32\n");

/*Set the binary byte order to SWAP */ viPrintf(viESA, "FORM:BORD SWAP\n");

/*Trigger a sweep */ viPrintf(viESA,"INIT:IMM\n");

/*Read the operation complete query */ viQueryf(viESA, "*OPC?\n", "%d", &lOpc); if (!lOpc)

{

printf("Program Abort! error ocurred: last command was not completed!\n"); exit(0);

}

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