Agilent Technologies B1500A Uživatelská příručka stáhnout pdf (Strana 150)

3-56 Agilent B1500 VXIplug&play Driver User’s Guide, Edition 3

Programming Examples for Visual Basic Users

Breakdown Voltage Measurement

Table 3-12 explains example subprograms that enable/disable measurement

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

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

transistor breakdown voltage.

Table 3-12 Breakdown Voltage Measurement Example

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

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

pins(0) = 1 ’SMU1: emitter

’pins(1) = 2 SMU2: base - open

pins(2) = 4 ’SMU4: collector

ret = agb1500_setSwitch(vi, pins(2), 1) ’8

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

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

check_err vi, ret ’11

vbd_meas vi, ret, pins() ’13

ret = agb1500_setSwitch(vi, agb1500_CH_ALL, 0) ’15

check_err vi, ret

End Sub ’18

Line Description

1 Beginning of the perform_meas subprogram.

3 to 6 Declares variables, and defines the value.

8 to 10 Enables measurement channels.

13 Calls the vbd_meas subprogram (next page) to perform

breakdown voltage measurement.

15 Disables measurement channels.

11 and 16 Calls the check_err subprogram (shown in Table 3-1) to check if

an error status is returned for the previous line.

18 End of the perform_meas subprogram.

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Agilent Technologies B1500A Uživatelská příručka Strana 150