Agilent Technologies B1500A Guide de l'utilisateur télécharger pdf (Page 151)

Agilent B1500 VXIplug&play Driver User’s Guide, Edition 3 3-57

Programming Examples for Visual Basic Users

Breakdown Voltage Measurement

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

Dim vstart As Double

Dim vstop As Double

Dim vb As Double

Dim ve As Double

Dim iccomp As Double

Dim ibcomp As Double

Dim iecomp As Double

Dim hold As Double

Dim delay As Double

vstart = 0

vstop = 100 ’interlock cable must be connected.

vb = 0.7

ve = 0

iccomp = 0.005

ibcomp = 0.01

iecomp = 0.1

hold = 0

delay = 0 ’19

Dim meas As Double ’21

Dim status As Long

ret = agb1500_force(vi, pins(0), agb1500_VF_MODE, 0, ve, iecomp, 0) ’24

’ret = agb1500_force(vi, pins(1), agb1500_VF_MODE, 0, vb, ibcomp, 0)

ret = agb1500_setBdv(vi, pins(2), 0, vstart, vstop, iccomp, hold, delay)

check_err vi, ret

ret = agb1500_measureBdv(vi, agb1500_SHORT_INTERVAL, meas, status) ’28

check_err vi, ret

ret = agb1500_zeroOutput(vi, agb1500_CH_ALL) ’30

check_err vi, ret

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

End Sub

Line Description

1 Beginning of the vbd_meas subprogram.

3 to 19 Declares variables for source channels, and defines the value.

21 to 22 Declares variables for the measurement data and the status data.

24 to 26 Applies voltage to device, and sets the quasi pulsed voltage source.

28 Performs the quasi pulsed spot measurement (breakdown voltage measurement).

30 Sets the specified port to the zero output state.

27, 29, and 31 Calls the check_err subprogram (shown in Table 3-1) to check if an error status is

returned for the previous line.

32 Calls the display_data subprogram (shown below) to display measurement data.

33 End of the vbd_meas subprogram.

1 2 ... 146 147 148 149 150 151 152 153 154 155 156 ... 207 208

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Agilent Technologies B1500A Guide de l'utilisateur Page 151

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