TDR Fundamentals
Step Reflection Testing
9-9
Figure 9-6
TDR Displays for Typical Loads
These displays are easily interpreted by recalling this equation:
Knowledge of E
i
and E
r
, as measured on the oscilloscope, allows Z
L
to be
determined in terms of Z
o
, or vice versa. In Figure 9-6, for example, we may
verify that the reflections are actually from the terminations specified.
ρ
E
r
E
i
-----
Z
L
Z
o
–
Z
L
Z
o
+
------------------==
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