3. Getting Started
Table 3.2 (Continued) Math Menu
Menu Selection Purpose/Action
Difference Creates subtraction trace from selected trace and base
trace (Difference = Selected – Base).
1st Derivative Creates first derivative trace from selected trace.
Der. Smooth Off/On Toggles first derivative trace smoothing.
3.9.3. SELECT Button
The SELECT button switches which on-screen trace is the active trace. See Section 4.9.1 for more
information on selected traces.
When the SELECT button is held down, pressing the M-FUNC button will generate a screenshot
to save on a USB drive.
3.9.4. AUTOFIT/HELP Button and Menu
The AUTOFIT/HELP button calls up the online help library, AUTOFIT soft-menu options,
options for resetting the CT100B’s configurations that influence trace measurements, and an
option to download a PDF of this manual to a USB drive.
For the help library, use the M-FUNCTION knob and Select menu option to scroll through and
select topics.
When you select the AUTOFIT menu option, the CT100B looks for the TDR signature of an open-
or short-terminated cable and selects appropriate horizontal and vertical scale values to display the
entire cable on the screen. By default the cursors are positioned approximately to the beginning
and end of the cable. This is the quickest way to find the distance to fault of a broken cable.
If you select Autofit w/o Cursors, the entire cable will be displayed on-screen, but the cursor
position will not be affected.
If Vertical Reset is selected then only vertical scale and position are affected.
Selecting Reset Options brings up four different options for changing the settings of the CT100B
along with brief descriptions of the options (Figure 3.5). You can reset the basic settings, load a
default configuration, load a saved configuration, or reset all device settings to the factory settings.
If the CT100B does not have saved default or user configurations, those options will be grayed
out.
CT100B TDR Cable Analyzers Operator’s Manual 19
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