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SECTION 5: WAVEFORM EXAMPLES
A great variety of waveforms may be encountered.
This is due to the various applications and electrical
and environmental characteristic differences found in
the wide variety of cables that exist today.
Remember: The reflection of a fault or component will
look different on a short length of cable than it will on
a long length of cable.
Various industries, cable types, and components
produce many different waveforms. The TDR's pulse
width, horizontal zoom, and vertical gain settings all
affect how a waveform will appear.
Practice testing various known cable segments, with
and without components. Become familiar with how
each segment looks prior to any problems.
A reflection with the same polarity indicates a fault with
OPEN (high impedance) tendencies. The reflection
shown at the 2nd cursor is a complete open.
Line 1 Pulse = 2 nsec VOP
V Gain = 2 x
VOP = 83%
L1 =6 dBRL
Batt
P r e s s
*
1 7 8 ft
5 4 m
1
2
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