3. Getting Started
3.13. Measurement Settings
3.13.1. Horizontal Units
Horizontal distance measurements can be displayed in meters, inches, feet, yards, or centimeters.
1. Select MENU → Measurement menu.
2. Select the Horiz. Units menu item to switch between the different unit options.
All measurements and all traces are immediately updated to reflect the unit change. Time in
nanoseconds (ns) is displayed separately.
3.13.2. Vertical Units
The CT100B is able to change vertical units of the live TDR trace so that it is displayed in units of
reflection coefficient (millirho), impedance (ohms), or voltage standing wave ratio (VSWR).
Changing the vertical units changes the appearance of the selected trace. To change vertical units,
use the following procedure:
1. Select MENU → Measurement menu.
2. Select Vert. Units to toggle through the different options.
An example trace with impedance (ohms) as the vertical unit is shown in Figure 3.11. Note that
the vertical scale is in ohms and the open fault at the end of the cable on the red (Impedance)
trace shows a nonlinear relationship between the reflection coefficient (millirho, shown by the black
trace) and the impedance as described in Section 7.6.
Figure 3.11. TDR trace with impedance vertical units (red, top) demonstrating vertical
scale in ohms and emphasis of the open fault at the end of the cable. The black trace uses
reflection coefficient (millirho) as its vertical units.
36 CT100B TDR Cable Analyzers Operator’s Manual
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