4. Operating Instructions
4.8. Scan a Cable
The CT100B can scan a cable with user-defined resolutions. The user can optionally save these
records into internal storage. CT100B scans differ from traditional TDR traces because they can
be used to save detail at a much higher resolution than displayed on the screen. Cable scans can
subsequently be reviewed at different levels of detail and compared to prior scans to identify subtle
changes in cable or connector performance. See Figure 4.18. Scans may also be referred to as
traces in this manual.
Figure 4.18. Scan of a portion of a cable (red), zoomed-in vertically to show additional
detail relative to the live trace (black).
Saved scans can be displayed on the screen in addition to the live trace. Pressing the SELECT
button switches between traces. Vertical position and scale are adjusted for individual traces.
Changing these values for one trace won’t affect other traces.
There are two types of scans:
1. Snapshot scan - Captures the live trace as it appears on the screen. This can work well if
using Normal or Fixed resolution mode. If using Screen resolution, the result may be less
detailed.
2. Cursor scan - Captures the entire trace between the two cursors using the current sample
resolution (see Section 3.12). This works even if one or both cursors are off-screen when you
begin the scan.
To scan a cable or cable section:
1. Press the SCAN button to bring up the Scan menu.
2. Select Snapshot or Cursor.
3. Choose the Start Scan option from the menu to begin a cable scan.
4. Select the cable scan (see Section 4.9.1 below) and manipulate as needed.
CT100B TDR Cable Analyzers Operator’s Manual 53
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