Agilent Technologies B1500A Service Manual download pdf (Page 274)

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3-96 Agilent B1500A/B1505A Programming Guide, Edition 11

Programming Examples

C-f Sweep Measurements

The following program performs a capacitance vs frequency sweep measurement.

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 3-25 C-f Sweep 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 = 10 ’t(2): Source

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

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

Dim value As String = "Freq (MHz), Cp (pF), C_st, G (uS), G_st, OSC (mV), Osc_st,

DC (V), Dc_st, Time (s)"

Dim fname As String = "C:\Agilent\prog_ex\data25.txt"

Dim title As String = "C-f 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 dc_bias As Double = 5

Dim f1 As Double = 500000.0

Dim f2 As Double = 5000000.0

Dim hold As Double = 0

Dim delay As Double = 0

Dim s_delay As Double = 0

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 mon(nop1 * 2) As Double

Dim st_mon(nop1 * 2) As String

Dim tm(nop1) As Double

session.Timeout = 120000 ’B1500 timeout = 120 seconds ’32

session.WriteString("FMT 1,1" & vbLf)

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

Line Description

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

13 to 30 Declares variables and sets the value.

32 to 34 Sets the B1500A timeout and the data output format (data with source data). And

enables the time stamp output.

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Agilent Technologies B1500A Service Manual Page 274

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