Agilent Technologies B1500A Podręcznik Użytkownika Pobierz pdf (Strona 153)

Agilent B1500 VXIplug&play Driver User’s Guide, Edition 3 3-59

Programming Examples for Visual Basic Users

Leakage Current Measurement

Table 3-13 explains example subprograms that enable/disable measurement

channels (perform_meas), perform the quasi pulsed spot measurement (spot_meas),

and display measurement result data (display_data). This example measures

MOSFET drain current.

Table 3-13 Leakage Current Measurement Example

Sub perform_meas(vi As Long, ret As Long) ’1

Dim pins(4) As Long ’SMU port numbers ’3

pins(0) = 1 ’SMU1: drain

pins(1) = 2 ’SMU2: gate

pins(2) = 4 ’SMU4: source

pins(3) = 6 ’SMU6: substrate

ret = agb1500_setSwitch(vi, pins(3), 1) ’9

ret = agb1500_setSwitch(vi, pins(2), 1)

ret = agb1500_setSwitch(vi, pins(1), 1)

ret = agb1500_setSwitch(vi, pins(0), 1)

check_err vi, ret ’13

spot_meas vi, ret, pins() ’15

ret = agb1500_setSwitch(vi, agb1500_CH_ALL, 0) ’17

check_err vi, ret

End Sub ’20

Line Description

1 Beginning of the perform_meas subprogram.

3 to 7 Declares variables, and defines the value.

9 to 12 Enables measurement channels.

15 Calls the spot_meas subprogram (next page) to perform spot

measurement.

17 Disables measurement channels.

13 and 18 Calls the check_err subprogram (shown in Table 3-1) to check if

an error status is returned for the previous line.

20 End of the perform_meas subprogram.

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Agilent Technologies B1500A Podręcznik Użytkownika Strona 153