Bnc 1201 - 6 1/2 Digit Digital Multimeter Manual do Utilizador descarregar pdf (Página 167)

168

Using CONFigure with a Math Operation

The following example uses CONFigure with the dBm math operation.

The CONFigure command gives you a little more programming

flexibility than the MEASure? command. This allows you to

“incrementally” change the multimeter’s configuration. The example is

is shown in Visual Basic.

Creating the Application

Create a new Visual Basic project as follows:

1. Create a new Standar.EXE project.

2. To set the startup object for a Windows Application to Sub Main

3. Add New Module, Declare a Sub Main().

LISTING D.2. THE CONFigure FUNCTION.

Public Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)

Sub main()

Rem #########################################

Rem

Rem Using NI-VISA library visa32.dll

Rem

Rem Set sample count 5 configuration and

Rem read the trigger

Rem

Rem #########################################

Dim stat As ViStatus

Dim dfltRM As ViSession

Dim sesn As ViSession

Dim fList As ViFindList

Dim desc As String * VI_FIND_BUFLEN

Dim nList As Long

Dim ret As Long

Dim readin As String * 128

Dim i As Integer ' Array index

stat = viOpenDefaultRM(dfltRM)

If (stat < VI_SUCCESS) Then

'Rem Error initializing VISA ... exiting

MsgBox "USBTMC resource not found.", vbExclamation, "1201 multimeter

device test"

Exit Sub

End If

Rem Find all 1201 USBTMC instruments in the system

stat = viFindRsrc(dfltRM, "USB[0-9]*::0x164E::0x0FA3::?*INSTR", fList,

nList, desc)

1 2 ... 162 163 164 165 166 167 168 169 170 171 172 ... 176 177

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Bnc 1201 - 6 1/2 Digit Digital Multimeter Manual do Utilizador Página 167