3. Getting Started
Figure 3.4. Keyboard controls for front panel buttons and knobs.
3.9. Menu Selections and Function Buttons
3.9.1. M-FUNC Button
The M-FUNC button is used to switch between functions Brightness, Shift, Smooth, and Vp (and
Fine/Coarse Vp) shown in the Multifunction indicator at the top of the display screen.
Brightness controls how bright the screen display is. When the CT100B is powered on, Brightness
will always be at 100 percent. Use the M-FUNCTION knob to decrease or increase screen
brightness.
With Shift selected, you can use the M-FUNCTION knob to slide the entire displayed scan left
and right. If you have a scanned or saved trace selected, Shift will move the trace independently of
the live trace or other traces on-screen.
Smooth controls how many successive scans should be averaged when drawing the displayed trace.
This is done to decrease visible noise on the trace. For more information about smoothing,
see Section 4.6.
Vp or velocity of propagation is the measure of the velocity of an electrical signal within a cable
expressed as a fraction of the speed of light. When Vp is selected, turning the M-FUNCTION knob
will adjust the Vp value for the displayed cable. For more information about Vp, see Section 4.3.
3.9.2. SCAN Button and Menu
The SCAN button displays menu selections associated with saving and managing TDR traces and
cable scan records. SCAN menu selections are shown in Table 3.1.
CT100B TDR Cable Analyzers Operator’s Manual 15
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