Programming Examples

Measuring Harmonic Distortion (RS-232)

dFundamental =50.0;

/* Open a serial session at COM1 */ viStatus=viOpenDefaultRM(&defaultRM);

if (viStatus =viOpen(defaultRM,"ASRL1::INSTR",VI_NULL,VI_NULL,&viESA) !=

VI_SUCCESS)

{

printf("Could not open a session to ASRL device at COM1!\n"); exit(0);

}

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

/*Reset the instrument*/ viPrintf(viESA,"*RST\n");

/*Display the program heading */

printf("\n\t\t Harmonic Distortion Program \n\n" );

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

/*Prompt user for fundamental frequency*/

printf("\t Enter the input signal fundamental frequency in MHz ");

/*The user enters fundamental frequency*/ scanf("%lf",&dFundamental);

/*Set the analyzer center frequency to the fundamental frequency. */ viPrintf(viESA,"SENS:FREQ:CENT %lf MHZ\n",dFundamental);

/*Set the analyzer to 10MHz Span */ viPrintf(viESA,"SENS:FREQ:SPAN 10 MHZ\n");

/*Put the analyzer in a single sweep mode */ viPrintf(viESA,"INIT:CONT 0\n");

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

/*Perform a peak search */ viPrintf(viESA,"CALC:MARK:MAX\n");

/* Place the signal at the reference level using the marker-to-reference level command and take sweep */

Chapter 3

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Agilent Technologies Model A.08.xx manual
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Model A.08.xx specifications

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