3. Getting Started
Table 3.4 (Continued) MENU Button and Menus
Menu Selection Purpose/Action
Cable Len (part of Standard Main
menu)
Adjusts the pulse timing for different length cables:
▷ Short ............................ For cables of up to approximately* 300 ft. (90 m) long.
▷ Medium ........................... For cables up to 1500 ft. (450 m) long.
▷ Long.............................. For cables up to 6000 ft. (1800 m) long.
[Note: Access Extra Long Mode in the Measurement
submenu. Use Extra Long Mode for cables over a mile
(2 km) in length.]
This menu selection can also be found at MENU →
Measurement → Meas. Settings.
*The exact length will depend on the Vp setting.
Resolution (part of Standard Main
menu)
Sets TDR trace horizontal sampling resolution (in
picoseconds):
▷ Normal ........................... A setting suitable for connector level detail for each of
the cable length modes. Short is nominally 5.34 ps
(< 1 mm). Medium is nominally 17.5 ps (~2 mm).
Long is nominally 49.6 ps (~1/2 inch). Extra Long is
nominally 381.5 ps (~2 inches). The actual setting is
dependent on horizontal scale, but will be at least as
good as the nominal value. If the user adjusts the
Horizontal Scale to zoom in to a very short section of
cable, the resolution setting will automatically adjust
to a finer scale. Multiple measurements may map to a
single horizontal offset on the display. This allows you
to easily see flaws in the cable or connectors even
when looking at long sections (see Figure 3.10).
▷ Fixed ............................ Allows user to set a specific value no matter the cable
length setting.
▷ Screen ........................... Screen resolution (1 sample/pixel) varies dynamically
with the current horizontal scale.
This menu selection can also be found at MENU →
Measurement → Meas. Settings.
File (Load/Save) (part of
Standard Main menu)
Calls up the FILE button menu. Use it to add, select,
or delete an entry from the cable type, user
configuration, and/or cable record libraries. See
Table 3.3: FILE Button and Menu.
Connect to CT Viewer (part of
Standard Main menu)
CT100B TDR Cable Analyzers Operator’s Manual 23
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