Agilent Technologies InfiniiVision 5000 Series Programmer's Manual page 716

12
Programming Examples
716
FormatNumber(((lngPoints / 2) * _
dblXIncrement + dblXOrigin) * 1000000) + " us" + vbCrLf
' QUERY_WAVE_DATA - Outputs waveform data that is stored in a buffer.
' Query the oscilloscope for the waveform data.
err = viVPrintf(vi, ":WAV:DATA?" + vbLf, 0)
' 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.
' 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
paramsArray(1) = VarPtr(byteArray(0))
retCount = ByteArraySize
' Unsigned integer bytes.
err = viVScanf(vi, "%#b" + vbLf, paramsArray(0))
' retCount is now actual number of bytes returned by query.
For lngI = 0 To retCount - 1 Step (retCount / 20)
If intBytesPerData = 2 Then
lngDataValue = CLng(byteArray(lngI)) * 256 + _
CLng(byteArray(lngI + 1))
Else
lngDataValue = CLng(byteArray(lngI))
End If
strOutput = strOutput + "Data point " + _
CStr(lngI / intBytesPerData) + ", " + _
FormatNumber((lngDataValue - lngYReference) * sngYIncrement + _
sngYOrigin) + " V, " + _
FormatNumber(((lngI / intBytesPerData - lngXReference) * _
dblXIncrement + dblXOrigin) * 1000000) + " us" + vbCrLf
Next lngI
MsgBox "Waveform data:" + vbCrLf + strOutput
' Make a delay measurement between channel 1 and 2.
Dim dblChan1Edge1 As Double
Dim dblChan2Edge1 As Double
Dim dblChan1Edge2 As Double
Dim dblDelay As Double
Dim dblPeriod As Double
Dim dblPhase As Double
' Query time at 1st rising edge on ch1.
' 16-bit value.
Agilent InfiniiVision 5000 Series Oscilloscopes Programmer's Guide
' 20 points.
' 8-bit value.
The