Agilent Technologies InfiniiVision 3000 X-Series, Руководство программиста

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228 Agilent InfiniiVision 3000 X-Series Oscilloscopes Programmer's Guide
7
:ACQuire Commands
Option Explicit
Public myMgr As VisaComLib.ResourceManager
Public myScope As VisaComLib.FormattedIO488
Public varQueryResult As Variant
Public strQueryResult As String
Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Sub Main()
On Error GoTo VisaComError
' Create the VISA COM I/O resource.
Set myMgr = New VisaComLib.ResourceManager
Set myScope = New VisaComLib.FormattedIO488
Set myScope.IO = _
myMgr.Open("USB0::0x0957::0x17A6::US50210029::0::INSTR")
myScope.IO.Clear ' Clear the interface.
' Turn on segmented memory acquisition mode.
myScope.WriteString ":ACQuire:MODE SEGMented"
myScope.WriteString ":ACQuire:MODE?"
strQueryResult = myScope.ReadString
Debug.Print "Acquisition mode: " + strQueryResult
' Set the number of segments to 25.
myScope.WriteString ":ACQuire:SEGMented:COUNt 25"
myScope.WriteString ":ACQuire:SEGMented:COUNt?"
strQueryResult = myScope.ReadString
Debug.Print "Acquisition memory segments: " + strQueryResult
' If data will be acquired within the IO timeout:
'myScope.IO.Timeout = 10000
'myScope.WriteString ":DIGitize"
'Debug.Print ":DIGitize blocks until all segments acquired."
'myScope.WriteString ":WAVeform:SEGMented:COUNt?"
'varQueryResult = myScope.ReadNumber
' Or, to poll until the desired number of segments acquired:
myScope.WriteString ":SINGle"
Debug.Print ":SINGle does not block until all segments acquired."
Do
Sleep 100 ' Small wait to prevent excessive queries.
myScope.WriteString ":WAVeform:SEGMented:COUNt?"
varQueryResult = myScope.ReadNumber
Loop Until varQueryResult = 25
Debug.Print "Number of segments in acquired data: " _
+ FormatNumber(varQueryResult)
Dim lngSegments As Long
lngSegments = varQueryResult
' For each segment:
Dim dblTimeTag As Double
Dim lngI As Long