Tektronix WCA200A, User Manual

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Trace Comparison Display and Average Function
3- 190
WCA230A & WCA280A User Manual
Saving/Loading Waveform Data
You can save the waveform data currently being acquired in a file, and load the
saved data as trace 1 or 2.
To save Trace 1 or 2 in a file:
1. Press the TRACE/AVG key on the front panel.
2.
Press the
Select Trace
side key to select Trace 1 or 2.
3. Press the Save Trace side key and select the destination file. For information
about file operations, refer to page 3--239 and subsequent pages.
To load Trace 1 or 2 from a file:
1. Press the TRACE/AVG key on the front panel.
2. Press the Select Trace side key to select Trace 1 or 2.
3. Press the Load Trace side key and select the source file. (The trace is
automatically frozen.) For information about file operations, refer to
page 3--239 and subsequent pages.
Trace Compression
Although waveform data are acquired as 1024 points per frame, the acquired data
are displayed after being thinned out and compressed due to the limitation of the
number of pixels on screen. The compression method and the procedure to select
the method are described in the following section.
One frame contains FFT points (1024) of data. Part of the data in the frame is
invalid for the calculation. The analyzer discards invalid data and displays only
valid data. Valid data are called “bin”. The number of bins depends on the span
as shown in Table 3--29.
Table 3- 29: Number of bins (FFT points: 1024)
Span Number of bins
2 MHz or less 641
5 MHz 801
10 MHz 801
15 MHz 601
20 MHz (Baseband only) 801
Saving a Trace
Loading a Trace
Relation between Frame,
Bin, and Pixel