Tektronix OM4006D, User Manual

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Operating basics
OUI Controls panel The Controls panel is typically pinned to the left side for easy access to signal
acquisition and plot scale controls.
Table 9: Controls panel elements
Control Description
Rec Len Record Length. Determines the oscilloscope record length for the next
acquisition. The record length in turn determines the horizontal time scale
given a
fi xed sampling rate. Since different oscilloscopes allow different
record lengths, the OUI replaces your entry with the closest available
larger record length for the connected oscilloscope after you click Single or
Run-Stop to start the acquisition.
Blk Size Block Size. Sets the number of points that are processed at one time.
For record lengths up to 10,000 or even 50,000 points, it makes sense to
process everything at once. This will happen if Blk Size is greater than or
equal to Rec Len. However, for record sizes above 50,000, there can be
a delay of many seconds waiting for processing. In this case, breaking
the processing up into blocks gives you more frequent screen updates.
Select Blk Size < Rec Len.
The progress bar shows the task completion status. Block Processing is
further explained later in the document
Block Processing is most important when the size of the record is so large
that it begins to tax the memory limits of the computer. This can begin to
happen at 200,000 points but is more likely a problem at 1,000,000 points
and above.
30 OM4000D Series Coherent Lightwave Signal Analyzer