Agilent Technologies B1500A Service Manual download pdf (Page 264)

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3-86 Agilent B1500A/B1505A Programming Guide, Edition 11

Programming Examples

Pulsed Sweep CV Measurements

The following program performs a capacitance vs voltage measurement by the

pulsed bias sweep. This example uses the multi frequency capacitance measurement

unit (MFCMU) and the SMU/CMU unify unit (SCUU).

Before performing the capacitance (impedance) measurement, you need to perform

the phase compensation and data correction. See “Data Correction” on page 3-71.

Table 3-23 Pulsed Sweep CV Measurement Example

Sub perform_meas(ByVal session As IMessage, ByVal t() As Integer) ’1

Dim i As Integer = 0 ’t(0): Drain

Dim j As Integer = 0 ’t(1): Gate

Dim nop1 As Integer = 21 ’t(2): Source

Dim nop2 As Integer = 1 ’t(3): Substrate

Dim data(nop2 - 1, nop1 - 1) As String

Dim value As String = "Vg (V), Cp (pF), C_st, G (uS), G_st, Time (s)"

Dim fname As String = "C:\Agilent\prog_ex\data23.txt"

Dim title As String = "Pulsed Sweep CV Sweep Measurement Result"

Dim msg As String = "No error."

Dim err As Integer = 0

Dim freq As Double = 1000000 ’13

Dim ref_cp As Double = 0

Dim ref_g As Double = 0

Dim osc_level As Double = 0.03

Dim vg1 As Double = -5

Dim vg2 As Double = 5

Dim range As Integer = 0

Dim rep As Integer = nop1

Dim sc(nop1) As Double

Dim md(nop1 * 2) As Double

Dim st(nop1 * 2) As String

Dim tm(nop1) As Double

session.Timeout = 60000 ’timeout = 60 seconds ’26

session.WriteString("FMT 1,1" & vbLf) ’data w/source data

session.WriteString("TSC 1" & vbLf) ’enables time stamp output

session.WriteString("DV " & t(0) & ",0,0,0.1,0" & vbLf)

session.WriteString("DV " & t(2) & ",0,0,0.1,0" & vbLf)

session.WriteString("SSP " & t(1) & ", 4" & vbLf) ’CMU to SCUU output

session.WriteString("ACT 0, 2" & vbLf) ’auto, 2 samples

Line Description

2 to 11 Declares variables used through the project. And sets the proper values.

13 to 24 Declares variables and sets the value.

26 to 28 Sets timeout and data output format. And enables the time stamp output.

29 to 30 Applies 0 V to the drain and source terminals.

31 to 32 Makes the SCUU connection path, and sets the A/D converter of the MFCMU.

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Agilent Technologies B1500A Service Manual Page 264

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