4-32 Agilent 4155C/4156C VXIplug&play Driver User’s Guide, Edition 4
Programming Examples for Visual Basic .NET Users
Sampling Measurements
Ag415x.SetSample(hold, interval, nop1) ’37
Ag415x.AddSampleSyncIv(t(0), Hp4156b.ModeEnum.VoltageOutput, 0, base, bias,
icomp)
Ag415x.AddSampleSyncIv(t(1), Hp4156b.ModeEnum.VoltageOutput, 0, base, bias,
icomp)
Ag415x.ErrorQuery(err, msg)
If err <> 0 Then Ag415x.ZeroOutput(0) : GoTo Check_err
Ag415x.Force(t(2), Hp4156b.ModeEnum.VoltageOutput, 0, vlout, ilcomp, 0) ’43
Ag415x.Sample(mch, mode, range, point, index, value, status)
Ag415x.ClearSampleSync()
If point <> nop1 Then Ag415x.ZeroOutput(0) : GoTo Check_err
For i = 0 To nop1 - 1 ’48
Dim r1 As Double = Math.Round(bias / value(2 * i), 3)
Dim r2 As Double = Math.Round(bias / value(2 * i + 1), 3)
data(j, i) = Chr(13) & Chr(10) & index(i) & "," & value(2 * i) * 1000
data(j, i) = data(j, i) & "," & r1 & "," & value(2 * i + 1) * 1000
data(j, i) = data(j, i) & "," & r2 & "," & status(i)
Next i
Ag415x.ZeroOutput(0) ’56
save_data(fname, title, val, data, nop1, nop2, Ag415x)
Check_err: ’59
If err <> 0 Then MsgBox("Instrument error: " & err & Chr(10) & msg, vbOKOnly, "")
If point <> nop1 Then MsgBox("No. of data: " & point & " (not " & nop1 & ")",
vbOKOnly, "")
End Sub
Line Description
37 to 41 Sets the timing parameters, sets the dc voltage sources for sampling measurement, and
checks if an error occurred. If an error is detected, forces 0 V and goes to Check_err.
43 to 46 Applies voltage to device and performs sampling measurement. After the measurement,
clears the setup of the dc voltage sources for the sampling measurement. And then, checks
if an error occurred. If an error is detected, forces 0 V and goes to Check_err.
48 to 54 Stores the measured data into the data valiable.
56 to 57 Applies 0 V from the all channels. And transfers the data stored in the data variable to the
save_data subprogram (see Table 4-1). And the subprogram will save the data into the
C:\Agilent\data\data11.txt file (CSV) and displays the data on a message box.
59 to 61 Displays a message box to show an error message if the error is detected.
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