5. Math Functions
Figure 5.1. Difference trace. Live (base trace, purple, top), comparison scan (red, middle),
difference (blue, bottom) traces show 3.43 ohm excess impedance (red circle) on the live
trace due to a loosened BNC connector.
5.2. First Derivative (Slope) Traces
The first derivative trace can be used for two main purposes. First, the first derivative trace can be
used to emulate the trace of a pulse-type TDR. Second, it may be used to remove the baseline
deviation of long or lossy cables caused by resistive loss, so that vertical gain can be used to
emphasize cable faults. To create a first derivative trace, use the following procedure:
1. Press the SCAN button. The Scan menu appears.
2. Press the SELECT button until the trace of interest is selected.
3. Select the Math option from the Scan menu. The Math menu will appear.
4. Select 1st Derivative from the menu.
5. A new trace is created that displays the first derivative of the base trace. See Figure 5.2.
78 CT100B TDR Cable Analyzers Operator’s Manual
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