HP 54753A User Manual page 187

Figure 9-8
Determining the Time Constant of a Reflected Wave Returning from a Complex Z
Discontinuities on the Line
So far, mention has been made only about the effect of a mismatched load at
the end of a transmission line. Often, however, one is not only concerned with
what is happening at the load, but also at intermediate points along the line.
Consider the transmission system in Figure 9-9.
Figure 9-9
Transmission System
The junction of the two lines (both of characteristic impedance Z
connector of some sort. Let us assume that the connector adds a small inductor
in series with the line. Analyzing this discontinuity on the line is not much
different from analyzing a mismatched termination. In effect, one treats
everything to the right of M in the figure as an equivalent impedance in series
with the small inductor and then calls this series combination the effective load
impedance for the system at the point M. Since the input impedance to the
TDR Fundamentals
Step Reflection Testing
L
) employs a
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9-13