Tektronix 1503C, User Manual, Page: 36 / 128

Operating Instructions
1–20
1503C MTDR User Manual
4. Push VIEW STORE and the stored waveform will appear above the current
waveform.
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N
ac 3.00 ft
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Figure 1–20: Current Waveform Centered, Stored Waveform Above
5. Push VIEW DIFF and the difference waveform will appear below the current
waveform.
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N
ac 3.00 ft
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Figure 1–21: Current Waveform Center, Stored Waveform Above, Difference Below
Notice the VIEW INPUT waveform is solid, VIEW DIFF is dotted, and VIEW
STORE is dot-dash.
There are many situations where the VIEW DIFF function can be useful. One
common situation is to store the waveform of a suspect cable, repair the cable, then
compare the two waveforms after the repair. During repairs, the VIEW INPUT,
VIEW DIFF, and VIEW STORE waveforms can be used to judge the effectiveness
of the repairs. The optional chart recorder can be used to make a chart of the three
waveforms to document the repair.
Another valuable use for the VIEW DIFF function is for verifying cable integrity
before and after servicing or periodic maintenance that requires moving or
disconnecting the cable.
The VIEW DIFF function is useful when you want to see any changes in the cable.
In some systems, there might be several reflections coming back from each branch
of the network. It might become necessary to disconnect branch lines from the cable