Agilent Technologies FS2010 Guide de l'utilisateur télécharger pdf (Page 56)

56 Agilent VISA User’s Guide

3 Programming with VISA

#include <visa.h>

#include <stdio.h>

void main () {

ViSession defaultRM, vi;

char strres [20];

unsigned long actual;

/* Open session to GPIB device at address 22 */

viOpenDefaultRM(&defaultRM);

viOpen(defaultRM, "GPIB0::22::INSTR",

VI_NULL,VI_NULL, &vi);

/* Initialize device */

viWrite(vi, (ViBuf)"*RST\n", 5, &actual);

/* Set up device and take measurement */

viWrite(vi, (ViBuf)"CALC:DBM:REF 50\n", 16,

&actual);

viWrite(vi, (ViBuf)"MEAS:VOLT:AC? 1, 0.001\n",

23, &actual);

/* Read results */

viRead(vi, (ViBuf)strres, 20, &actual);

/* NULL terminate the string */

strres[actual]=0;

/* Print results */

printf("Measurement Results: %s\n", strres);

/* Close session */

viClose(vi);

viClose(defaultRM);

}

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Agilent Technologies FS2010 Guide de l'utilisateur Page 56