Agilent Technologies DSO6014A/L, Programmer'S Reference Manual

Page: 459 / 634

Commands by Subsystem
3
Agilent 6000 Series Oscilloscopes Programmer's Reference 459
1000000) + " us" + vbCrLf
strOutput = str "Delay = " + _
FormatNumber(((lngPoints / 2 - lngXReference) * _
dblXInc dblXOrigin) * 1000000) + " us" + vbCrLf
' QUERY_WAVE_DATA - Outputs waveform data that is stored in a buffer.
' Query the oscilloscope for the waveform data.
myScope.WriteString ":WAV:DATA?"
' READ_WAVE_DATA - The wave data consists of two parts: the header,
' and the actual waveform data followed by a new line (NL) character.
' The query data has the following format:
'
' <header><waveform_data><NL>
'
' Where:
' <header> = #800001000 (This is an example header)
' The "#8" may be stripped off of the header and the remaining
' numbers are the size, in bytes, of the waveform data block. The
' size can vary depending on the number of points acquired for the
' waveform. You can then read that number of bytes from the
' oscilloscope and the terminating NL character.
'
Dim lngI As Long
Dim lngDataValue As Long
' Unsigned integer bytes.
varQueryResult = myScope.ReadIEEEBlock(BinaryType_UI1)
For lngI = 0 To UBound(varQueryResult) _
Step (UBound(varQueryResult) / 20) ' 20 points.
If intBytesPerData = 2 Then
lngDataValue = varQueryResult(lngI) * 256 _
+ varQueryResult(lngI + 1) ' 16-bit value.
Else
lngDataValue = varQueryResult(lngI) ' 8-bit value.
End If
strOutput = str "Data point " + _
CStr(lngI / intBytesPerData) + ", " + _
FormatNumber((lngDataValue - lngYReference) _
* sngYInc sngYOrigin) + " V, " + _
FormatNumber(((lngI / intBytesPerData - lngXReference) _
* sngXInc dblXOrigin) * 1000000) + " us" + vbCrLf
Next lngI
MsgBox "Waveform data:" + strOutput
Example program from the start: "VISA COM Example in Visual Basic" on
page 614