3. Operating Instructions
Figure 3.44.
Example layer peeling trace (yellow, bottom) versus live TDR trace (white,
top). The layer peeled trace reduces the impedance error in the final cable segment
(green arrows) by ~80%.
3.11.24. Fast Fourier Transform (FFT) Traces
The CT100B can calculate FFT frequency domain information from live and scanned TDR
traces. FFT traces can be used to show the frequency domain content of a trace or portion of a
trace between cursors, and comparisons of FFT traces can be used to demonstrate differences
and/or changes in frequency content, such as between different types of connectors or cable
faults. To create an FFT trace, use the following procedure:
1. Select the live trace with the
SELECT
button.
2. Use the
CURSOR
button and the
HORIZONTAL POSITION
knob to set the boundaries
for the FFT with a cursor at either end.
3. Press the
SCAN
button, and then select
Math
→
FFT Tools
.
4. Select
Apply FFT
. The CT100B will now take a high resolution scan of the live trace
between the cursors, and then convert the scan into an FFT plot.
FFT traces can be stored, reloaded, and transferred to CT Viewer 2 just like normal scanned
traces.
3.11.25. Web Export
The CT100B is able to export raw data and images in real time over Ethernet. To enable this
feature, follow this procedure:
1. Select
MENU
→
Settings
→
Network Settings
.
2. Toggle
Web Export
to
On
or
Fast
.
3. Using a web browser, navigate to one of the following address:
a) Live trace data is found at
http://<<IP_addr>>/www/trace.csv
and is stored as
comma seperated values.
b) Selected trace data is stored in as a CSV at
http://<<IP_addr>>/www/selected.csv
c) A screenshot of the CT100B is available as a bitmap at
http://<IP_addr>/www/screenshot.bmp
CT100B TDR Cable Analyzers Operator’s Manual
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