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N1021B Probe Kit
Probing a Differential Trace's Length Midpoint
What are the effects of probing a differential trace midway along the trace's length? At the
probe's tip, the TDR pulse splits into two parts traveling in opposing directions away from
the probe. To the probe, it appears that two impedances are connected in parallel. The net
effect of probing in the middle of traces are as follows:
- The transmitted signal is greatly attenuated.
- The reflected signal, as viewed and measured by the TDR module, is greatly attenuated.
- A large discontinuity appears in the line that sends a reflection back to the source.
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User's Guide
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