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Programming Examples 9
Agilent InfiniiVision 5000 Series Oscilloscopes Programmer's Reference 575
' GET_PREAMBLE - The preamble block contains all of the current
' WAVEFORM settings. It is returned in the form <preamble_block><NL>
' where <preamble_block> is:
' FORMAT : int16 -0=BYTE, 1 = WORD, 2 = ASCII.
' TYPE : int16 -0=NORMAL, 1 = PEAK DETECT, 2 = AVERAGE.
' POINTS : int32 - number of data points transferred.
' COUNT : int32 - 1 and is always 1.
' XINCREMENT : float64 - time difference between data points.
' XORIGIN : float64 - always the first data point in memory.
' XREFERENCE : int32 - specifies the data point associated with
' x-origin.
' YINCREMENT : float32 - voltage difference between data points.
' YORIGIN : float32 - value is the voltage at center screen.
' YREFERENCE : int32 - specifies the data point where y-origin
' occurs.
Dim intFormat As Integer
Dim intType As Integer
Dim lngPoints As Long
Dim lngCount As Long
Dim dblXIncrement As Double
Dim dblXOrigin As Double
Dim lngXReference As Long
Dim sngYIncrement As Single
Dim sngYOrigin As Single
Dim lngYReference As Long
Dim strOutput As String
' Query for the preamble.
err = viVPrintf(vi, ":WAVEFORM:PREAMBLE?" + vbLf, 0)
paramsArray(1) = VarPtr(dblArray(0))
retCount = DblArraySize
' Read preamble information.
err = viVScanf(vi, "%,#lf" + vbLf, paramsArray(0))
intFormat = dblArray(0)
intType = dblArray(1)
lngPoints = dblArray(2)
lngCount = dblArray(3)
dblXIncrement = dblArray(4)
dblXOrigin = dblArray(5)
lngXReference = dblArray(6)
sngYIncrement = dblArray(7)
sngYOrigin = dblArray(8)
lngYReference = dblArray(9)
strOutput = ""
'strOutput = strOutput + "Format = " + CStr(intFormat) + vbCrLf
'strOutput = strOutput + "Type = " + CStr(intType) + vbCrLf
'strOutput = strOutput + "Points = " + CStr(lngPoints) + vbCrLf
'strOutput = strOutput + "Count = " + CStr(lngCount) + vbCrLf
'strOutput = strOutput + "X increment = " + _
' FormatNumber(dblXIncrement * 1000000) + _
' " us" + vbCrLf
'strOutput = strOutput + "X origin ="+_
' FormatNumber(dblXOrigin * 1000000) + _
' " us" + vbCrLf
'strOutput = strOutput + "X reference = " + _