Agilent Technologies B1500A Instrukcja Obsługi Pobierz pdf (Strona 194)

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3-16 Agilent B1500A/B1505A Programming Guide, Edition 11

Programming Examples

Pulsed Spot Measurements

A program example of a pulsed spot measurement is shown below. This example

measures MOSFET drain current.

Table 3-4 Pulsed Spot 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 = "Id (uA), Status, Meas Time (msec)"

Dim fname As String = "C:\Agilent\prog_ex\data3.txt"

Dim title As String = "Measurement Result"

Dim msg As String = "No error."

Dim err As Integer = 0

Dim vd As Double = 3 ’13

Dim vg As Double = 1

Dim idcomp As Double = 0.05

Dim igcomp As Double = 0.01

Dim orng As Integer = 0

Dim mrng As Integer = 0

session.WriteString("FMT 1" & vbLf) ’19

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

session.WriteString("FL 0" & vbLf) ’sets filter off

session.WriteString("AV 1,1" & vbLf) ’sets number of samples for 1 data

session.WriteString("DV " & t(3) & ",0,0,0.1" & vbLf) ’out= 0 V, comp= 0.1 A

session.WriteString("DV " & t(2) & ",0,0,0.1" & vbLf) ’out= 0 V, comp= 0.1 A

Dim g_pt As String = "0.1,0.01,0.02" ’hold, width, period in sec

session.WriteString("PT " & g_pt & vbLf)

Dim v0 As Double = 0 ’0 V: pulse base voltage

session.WriteString("PV " & t(1) & "," & orng & "," & v0 & "," & vg & "," &

igcomp & vbLf)

session.WriteString("DV " & t(0) & "," & orng & "," & vd & "," & idcomp & vbLf)

session.WriteString("MM 3," & t(0) & vbLf) ’3: pulsed spot measurement

session.WriteString("CMM " & t(0) & ",1" & vbLf) ’1: current measurement

session.WriteString("RI " & t(0) & "," & mrng & vbLf) ’32

session.WriteString("ERR? 1" & vbLf) : err = session.ReadString(4 + 2)

If err <> 0 Then session.WriteString("DZ" & vbLf) : GoTo Check_err

Line Description

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

13 to 18 Declares variables and sets the value.

19 to 22 Sets the data output format, time stamp data output mode, SMU filter, and averaging.

23 to 29 Applies DC voltage to device, and sets the voltage pulse source.

30 to 32 Sets the measurement mode, channel measurement mode, and measurement range.

33 to 34 Checks if an error occurred. If an error is detected, forces 0 V and goes to Check_err.

1 2 ... 189 190 191 192 193 194 195 196 197 198 199 ... 597 598

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