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Example: A Simple Sine Waveform
This program (found in the "Examples\chapter6\SimpleSine" subdirectory on the CD-
ROM) selects the function as "sine," and then sets the frequency, amplitude and offset of
the waveform.
Private Sub cmdSimpleSine_Click()
Dim io_mgr As VisaComLib.ResourceManager
Dim Fgen As VisaComLib.FormattedIO488
Set io_mgr = New VisaComLib.ResourceManager
Set Fgen = New VisaComLib.FormattedIO488
Set Fgen.IO = io_mgr.Open(txtIO.Text)
On Error GoTo MyError
' This program sets up a waveform by selecting the waveshape
' and adjusting the frequency, amplitude, and offset.
With Fgen
.WriteString "*RST"
.IO.Clear
.WriteString "FUNCtion SINusoid"
' Other options are SQUare, RAMP, PULSe, NOISe, DC, and USER
.WriteString "OUTPut:LOAD 50"
' May also be INFinity, as when using oscilloscope or DMM
.WriteString "FREQuency 2500"
.WriteString "VOLTage 1.2"
.WriteString "VOLTage:OFFSet 0.4"
6
' Voltage may also be set as VOLTage:HIGH and VOLTage:LOW for low level
' and high level
.WriteString "OUTPut ON"
End With
Exit Sub
MyError:
txtError = Err.Description & vbCrLf
Resume Next
End Sub
Chapter 6 Application Programs
Program Listings
Program Listings
314
' Reset the function generator
' Clear errors and status registers
' Select waveshape
' Set the load impedance in Ohms
' (50 Ohms default)
' Set the frequency.
' Set the amplitude in Vpp.
' Also see VOLTage:UNIT
' Set the offset in Volts
' Turn on the instrument output
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