Agilent Technologies B1500A User's Guide download pdf (Page 204)

4-48 Agilent B1500 VXIplug&play Driver User’s Guide, Edition 3

Programming Examples for C++ Users

High Speed Spot C Measurement

Measurement

Result Example

Cp = 5.681398 pF (status= 0)

G = 27.148290 uS (status= 0)

AC level = 0.028929 V (status= 0)

DC bias = -4.767328 V (status= 0)

Time = 0.017700 sec

ret = agb1500_setCmuFreq(vi, agb1500_CH_CMU, freq); /* 32 */

ret = agb1500_forceCmuAcLevel(vi, agb1500_CH_CMU, osc_level);

open_corr (vi, ret, freq, ref_cp, ref_g);

ViInt32 rbx; /* 36 */

rbx = MessageBox(NULL , "Connect DUT. Then click OK.", "High Speed Spot C

measurement", MB_OK);

ret = agb1500_forceCmuDcBias(vi, agb1500_CH_CMU, dc_bias);

check_err (vi, ret);

ret = agb1500_resetTimestamp(vi); /* 41 */

ret = agb1500_spotCmuMeas(vi,agb1500_CH_CMU, agb1500_CMUM_CP_G, range, &md[0],

&st[0], &mon[0], &st_mon[0], &mt);

ret = agb1500_zeroOutput(vi, agb1500_CH_ALL);

check_err (vi, ret);

printf("Cp = %8.6f pF (status= %1d)\n", md[0] * 1000000000000, st[0]); /* 46 */

printf("G = %8.6f uS (status= %1d)\n", md[1] * 1000000, st[1]);

printf("AC level = %8.6f V (status= %1d)\n", mon[0], st_mon[0]);

printf("DC bias = %8.6f V (status= %1d)\n", mon[1], st_mon[1]);

printf("Time = %8.6f sec\n", mt);

ret = agb1500_setSwitch(vi, agb1500_CH_ALL, 0); /* 52 */

check_err (vi, ret);

}

Line Description

32 to 33 Sets the frequency and the oscillator level of the MFCMU output signal.

34 Calls the open_corr subprogram (shown in Table 4-16) used to perform the open

correction of the MFCMU.

36 to 38 Displays a message box that asks you to connect the device to the measurement

terminals. Then connect the CMUH and CMUL to the gate and substrate respectively.

Pressing OK applies DC bias from the MFCMU.

39, 44,

and 53

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

returned for the previous line.

41 to 43 Resets the time stamp, performs capacitance spot measurement, and applies 0 V from all

channels.

46 to 52 Displays the measurement result data. And disables all ports.

54 End of the perform_meas subprogram.

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Agilent Technologies B1500A User's Guide Page 204

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