Some impedance test systems are available with different impedance probes. Do I need a probe to match each impedance that I am asked to make?
When using a TDR you need to test on the flattest part of the test trace. It is perfectly acceptable to use a 50ohm probe in all cases and allow enough distance for the trace to flatten before setting the test limits. In cases where you are forced to use a short test coupon, i.e. you do not have enough length to allow the trace to flatten out, try using a probe with an impedance value close to that of the track under test.
Related Questions
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