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4-8 Agilent B1500 VXIplug&play Driver User’s Guide, Edition 3

Programming Examples for C++ Users

High Speed Spot Measurement

Measurement

Result Example

Id = 14.255001 mA (at 1.5 V)

Vg = 1.5 V

ret = agb1500_force(vi, bulk, agb1500_VF_MODE, 0, 0, 0.1, 0); /* 31 */

ret = agb1500_force(vi, source, agb1500_VF_MODE, 0, 0, 0.1, 0);

ret = agb1500_force(vi, gate, agb1500_VF_MODE, 2, vg, igcomp, 0);

ret = agb1500_force(vi, drain, agb1500_VF_MODE, 2, vd, idcomp, 0);

check_err (vi, ret); /* 35 */

ret = agb1500_spotMeas(vi,drain,agb1500_IM_MODE,0,&meas,&status,0);

check_err (vi, ret); /* 38 */

ret = agb1500_zeroOutput(vi, agb1500_CH_ALL); /* 40 */

check_err (vi, ret); /* 41 */

printf("Id = %9.6f mA (at %3.1f V)\n", meas * 1000, vd); /* 43 */

printf("Vg = %3.1f V\n", vg);

ret = agb1500_setSwitch(vi, agb1500_CH_ALL, 0); /* 46 */

check_err (vi, ret); /* 47 */

}

Line Description

31 to 34 Applies voltage to device.

37 Performs high speed spot measurement for the drain terminal.

40 Sets the specified port to the zero output state.

43 to 44 Displays the measurement result data.

46 Disables all ports.

35, 38, 41, and 47 Calls the check_err subprogram (shown in Table 4-1) to check if an error status is

returned for the previous line.

48 End of the perform_meas subprogram.

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Agilent Technologies B1500A Guida Utente Pagina 164