Agilent Technologies B1500A Guide de l'utilisateur télécharger pdf (Page 166)

4-10 Agilent B1500 VXIplug&play Driver User’s Guide, Edition 3

Programming Examples for C++ Users

Multi Channel Spot Measurement

Measurement

Result Example

Ic = 3.846500 mA (Time: 0.093200 sec)

Ib = 0.018970 mA (Time: 0.094300 sec)

hfe = 202.767528

mch[0] = collector; /* 31 */

mch[1] = base;

mch[2] = 0;

mode[0] = 1;

mode[1] = 1;

range[0] = 0;

range[1] = 0;

ret = agb1500_resetTimestamp(vi); /* 38 */

ret = agb1500_force(vi, emitter, agb1500_VF_MODE, 0, 0, 0.2, 0);

ret = agb1500_force(vi, base, agb1500_VF_MODE, 0, vb, ibcomp, 0);

ret = agb1500_force(vi, collector, agb1500_VF_MODE, 0, vc, iccomp, 0);

check_err (vi, ret); /* 42 */

ret = agb1500_measureM(vi, mch, mode, range, &md[0], &st[0], &tm[0]);

check_err (vi, ret); /* 45 */

ret = agb1500_zeroOutput(vi, agb1500_CH_ALL); /* 47 */

check_err (vi, ret); /* 48 */

printf("Ic = %8.6f mA (Time: %8.6f sec)\n", md[0] * 1000, tm[0]);

printf("Ib = %8.6f mA (Time: %8.6f sec)\n", md[1] * 1000, tm[1]);

printf("hfe = %10.6f \n", md[0]/md[1]); /* 52 */

ret = agb1500_setSwitch(vi, agb1500_CH_ALL, 0); /* 54 */

check_err (vi, ret); /* 55 */

}

Line Description

31 to 37 Defines the value for the variables used for the measurement channel.

38 Resets time stamp.

39 to 41 Applies voltage to device.

44 Performs multi channel spot measurement.

47 Sets the specified port to the zero output state.

50 to 52 Displays the measurement result data.

54 Disables all ports.

42, 45, 48 and 55 Calls the check_err subprogram (shown in Table 4-1) to check if an error status is

returned for the previous line.

56 End of the perform_meas subprogram.

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Agilent Technologies B1500A Guide de l'utilisateur Page 166