Agilent Technologies B1500A User's Guide download pdf (Page 154)

3-60 Agilent B1500 VXIplug&play Driver User’s Guide, Edition 3

Programming Examples for Visual Basic Users

Leakage Current Measurement

Sub spot_meas(vi As Long, ret As Long, pins() As Long) ’1

Dim vstart As Double

Dim vstop As Double

Dim vg As Double

Dim idcomp As Double

Dim igcomp As Double

Dim hold As Double

Dim delay As Double

Dim meas As Double

Dim status As Long

vstart = -5

vstop = 5

idcomp = 0.05

vg = 0

igcomp = 0.01

hold = 0.1

delay = 0.001 ’17

ret = agb1500_force(vi, pins(3), agb1500_VF_MODE, 0, 0, 0.05, 0) ’19

ret = agb1500_force(vi, pins(2), agb1500_VF_MODE, 0, 0, 0.05, 0)

ret = agb1500_force(vi, pins(1), agb1500_VF_MODE, 2, vg, igcomp, 0)

ret = agb1500_setIleak(vi, pins(0), 0, vstop, idcomp, vstart, hold, delay) ’22

check_err vi, ret

ret = agb1500_measureIleak(vi, pins(0), agb1500_SHORT_INTERVAL, meas, status) ’24

check_err vi, ret

ret = agb1500_zeroOutput(vi, agb1500_CH_ALL) ’26

check_err vi, ret

display_data meas, status, vi, ret, pins() ’28

End Sub

Line Description

1 Beginning of the spot_meas subprogram.

3 to 17 Declares variables, and defines the value.

19 to 21 Applies voltage to device.

22 Sets the quasi pulsed voltage source.

24 Performs the quasi pulsed spot measurement (leakage current measurement).

26 Sets the specified port to the zero output state.

23, 25, and 27 Calls the check_err subprogram (shown in Table 3-1) to check if an error status is

returned for the previous line.

28 Calls the display_data subprogram (next page) to display measurement data.

29 End of the spot_meas subprogram.

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Agilent Technologies B1500A User's Guide Page 154