Agilent Technologies B1500A User's Guide download pdf (Page 177)

Agilent B1500 VXIplug&play Driver User’s Guide, Edition 3 4-21

Programming Examples for C++ Users

Staircase Sweep Measurement

ret = agb1500_resetTimestamp(vi); /* 39 */

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

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

ret = agb1500_setIv(vi, gate, agb1500_SWP_VF_SGLLIN, 0, 0, vg, nop, hold, delay,

s_delay, igcomp, pgcomp);

check_err (vi, ret); /* 44 */

ret = agb1500_setNthSweep(vi, 2, drain, agb1500_VF_MODE, 0, 0, vd, idcomp, pdcomp);

check_err (vi, ret);

ret = agb1500_msweepIv(vi, drain, agb1500_IM_MODE, 0, &rep, &sc[0], &md[0], &st[0],

&tm[0]);

check_err (vi, ret); /* 50 */

ret = agb1500_zeroOutput(vi, agb1500_CH_ALL); /* 52 */

ret = agb1500_setSwitch(vi, agb1500_CH_ALL, 0);

check_err (vi, ret); /* 54 */

if ( rep != nop ) { /* 56 */

printf ("%d measurement steps were returned.\nIt must be %d steps.\n", rep, nop);

exit (ret);

} /* 59 */

printf(" Vg (V), Id (mA)\n"); /* 61 */

for (i = 0; i < nop; i++){

printf(" %4.2f, %9.6f \n", sc[i], md[i] * 1000);

} /* 64 */

Line Description

39 Resets time stamp.

40 to 41 Applies voltage to device.

43 Sets the primary sweep source.

46 Sets the synchronous sweep source by using the agb1500_setNthSweep function.

50 Performs staircase sweep measurement by using the agb1500_msweepIv function.

52 Sets the specified port to the zero output state.

53 Disables all ports.

44, 47, 50, and 54 Calls the check_err subprogram (shown in Table 4-1) to check if an error status is

returned for the previous line.

56 to 59 Stops the program execution if the number of returned data is not equal to nop.

61 to 64 Displays the measurement result data.

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Agilent Technologies B1500A User's Guide Page 177