Technical data

Programming Examples 12
Agilent InfiniiVision 6000 Series Oscilloscopes Programmer's Guide 893
' as it will ensure that sufficient data is available for
' measurement. Keep in mind when the oscilloscope is running,
' communication with the computer interrupts data acquisition.
' Setting up the oscilloscope over the bus causes the data
' buffers to be cleared and internal hardware to be
' reconfigured.
' If a measurement is immediately requested there may not have
' been enough time for the data acquisition process to collect
' data and the results may not be accurate. An error value of
' 9.9E+37 may be returned over the bus in this situation.
'
oscp.DoCommand(":DIGitize CHANnel1")
End Sub
' Analyze()
' --------------------------------------------------------------
' In this example we will do the following:
' - Save the system setup to a file for restoration at a later
' time.
' - Save the oscilloscope display to a file which can be
' printed.
' - Make single channel measurements.
Private Shared Sub Analyze()
' Results array.
Dim ResultsArray As Byte()
' Number of bytes returned from instrument.
Dim nLength As Integer
' SAVE_SYSTEM_SETUP - The :SYSTem:SETup? query returns a
' program message that contains the current state of the
' instrument. Its format is a definite-length binary block,
' for example,
' #800002204<setup string><NL>
' where the setup string is 2204 bytes in length.
Console.WriteLine("Saving oscilloscope setup to " _
+ "c:\scope\config\setup.dat")
If File.Exists("c:\scope\config\setup.dat") Then
File.Delete("c:\scope\config\setup.dat")
End If
' Query and read setup string.
nLength = oscp.DoQueryIEEEBlock(":SYSTem:SETup?", ResultsArray)
Console.WriteLine("Read oscilloscope setup ({0} bytes).", _
nLength)
' Write setup string to file.
File.WriteAllBytes("c:\scope\config\setup.dat", ResultsArray)
Console.WriteLine("Wrote setup string ({0} bytes) to file.", _
nLength)
' RESTORE_SYSTEM_SETUP - Uploads a previously saved setup
' string to the oscilloscope.
Dim DataArray As Byte()
Dim nBytesWritten As Integer