Agilent Technologies B1500A Servisní příručka stáhnout pdf (Strana 245)

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Agilent B1500A/B1505A Programming Guide, Edition 11 3-67

Programming Examples

High-Speed Spot C Measurements

The following program performs a high-speed spot capacitance measurement by

using the TTC command. 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 3-18 High-Speed Spot C 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 = 1 ’t(2): Source

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

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

Dim value As String = "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\data18.txt"

Dim title As String = "High Speed Spot C 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 range As Integer = 0

Dim md(nop1) As Double

Dim st(nop1) As String

Dim mon(nop1) As Double

Dim st_mon(nop1) As String

Dim mt As Double

session.Timeout = 60000 ’timeout = 60 seconds ’25

session.WriteString("FMT 1" & vbLf)

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 23 Declares variables and sets the value.

25 to 27 Sets timeout and data output format. And enables time stamp output.

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

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

1 2 ... 240 241 242 243 244 245 246 247 248 249 250 ... 597 598

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