Agilent Technologies 66309B Manuale Utente

       Example Programs - D

{
        printf("viOpenDefaultRM error, check your hardware connections\n");
            exit (-1);
    }

    /* Open the instrument at address 5 for Communication */
    err = viOpen(defRM, "GPIB0::5::INSTR", VI_NULL, 5000, &instrumentHandle);
    if (err)
    {
            viClose(defRM);
            printf("viOpen error, check the device at address 5\n");
            exit (-1);
    }

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

    /* turn on the output */
    viPrintf(instrumentHandle, "OUTP 1\n");

    /* Set output voltage (2V) and current (1A) levels, turn output on*/
    viPrintf(instrumentHandle, "VOLT %.5lg;:CURR %.5lg\n", 2.0, 1.0);

    /* Measure the dc voltage level at the output terminals */
    viQueryf(instrumentHandle, "MEAS:VOLT?\n", "%lf", &measvoltage);

    /* Measure the dc current level at the output terminals */
    viQueryf(instrumentHandle, "MEAS:CURR?\n", "%lf", &meascurrent);

    printf ("Output Voltage = %f;  Output Current = %f \n",
        measvoltage,meascurrent);

    /* configure dc source for dynamic measurements */
    /* change sweep parameters */
    viPrintf(instrumentHandle, "SENS:SWE:TINT %.5lg;POIN %ld;OFFS:POIN %ld\n",
            31.2E-6,/* sampling rate = 31.2us */
            256,    /* sweep size = 256 points */
            -4);    /* pre-trigger offset = 4 points (~125us) */

    /* setup the voltage sensing triggered measurement parameters */
    /* voltage trigger level to 2.75V */
    /* hysteresis band to +/- 0.1V */
    /* positive slope */
    /* trigger count */
    /* acquisition triggered by measurement */
    viPrintf(instrumentHandle, "SENS:FUNC \"VOLT\"\n");
    viPrintf(instrumentHandle, "TRIG:ACQ:LEV:VOLT %.5lg\n", 2.75);
    viPrintf(instrumentHandle, "TRIG:ACQ:HYST:VOLT %.5lg\n", 0.1);
    viPrintf(instrumentHandle, "TRIG:ACQ:SLOP:VOLT POS\n");
    viPrintf(instrumentHandle, "TRIG:ACQ:COUN:VOLT %ld\n", 1);
    viPrintf(instrumentHandle, "TRIG:ACQ:SOUR INT\n");

    /* initiate the acquisition system for measurement trigger */
    printf ("Arm acquisition system...\n");
    viPrintf(instrumentHandle, "INIT:NAME ACQ\n");

    /* must allow time for pre-triggered samples */
    printf ("Pre-trigger delay...\n");

    /* trigger the acquisition by changing the output voltage level to 5V */
    printf ("Trigger acquisition...\n");
    viPrintf(instrumentHandle, "VOLT %.5lg\n", 5.0);