Agilent Technologies B1500A User's Guide download pdf (Page 170)

4-14 Agilent B1500 VXIplug&play Driver User’s Guide, Edition 3

Programming Examples for C++ Users

Staircase Sweep Measurement

ret = agb1500_setSwitch(vi, drain, 1); /* 38 */

ret = agb1500_setSwitch(vi, gate, 1);

ret = agb1500_setSwitch(vi, source, 1);

ret = agb1500_setSwitch(vi, bulk, 1);

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

ret = agb1500_resetTimestamp(vi); /* 44 */

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);

for (j = 0; j < nop2; j++){ /* 48 */

dvg[j] = (j + 1) * vg / nop2;

ret = agb1500_force(vi, gate, agb1500_VF_MODE, 0, dvg[j], igcomp, 0);

ret = agb1500_setIv(vi, drain, agb1500_SWP_VF_SGLLIN, 0, 0, vd, nop1, hold,

delay, s_delay, idcomp, p_comp);

check_err (vi, ret);

ret = agb1500_sweepIv(vi, drain, agb1500_IM_MODE, 0, &rep, &sc[i], &md[i],

&st[i], &tm[i]);

check_err (vi, ret);

if ( rep = nop1 ) {

i = i + nop1;

}

else {

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

nop1);

ret = agb1500_zeroOutput(vi, agb1500_CH_ALL);

ret = agb1500_setSwitch(vi, agb1500_CH_ALL, 0);

check_err (vi, ret);

exit (ret);

}

} /* 67 */

ret = agb1500_zeroOutput(vi, agb1500_CH_ALL); /* 69 */

check_err (vi, ret);

Line Description

38 to 41 Enables measurement channels.

44 Resets time stamp.

45 to 46 Applies voltage to device.

48 to 67 Applies dc voltage and sweep voltage, and performs staircase sweep measurement.

After that, disables all ports and stops the program execution if the number of

returned data is not equal to the nop1 value.

69 Sets the specified port to the zero output state.

42 and 70 Calls the check_err subprogram (shown in Table 4-1) to check if an error status is

returned for the previous line.

1 2 ... 165 166 167 168 169 170 171 172 173 174 175 ... 207 208

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Agilent Technologies B1500A User's Guide Page 170

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