We occasionally find an open PCB trace (or perhaps via). Of course, the
problem is on an inner layer. We can tell from continuity measurements
that we have a problem between one via and the next. But where is the
break? At one of the vias, on the trace? Is there a tracing device where
we can inject a signal at a via and then follow it down the trace? I've
seem something like this for tracing cable pairs in telephone cables. Is
there something like this to find a problem in a PCB?

Thanks!

Harold



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