Harold,
I've used a signal generator and a scope to find breaks in cables.
Might work on PCBs provided the trace is not too buried. On cables it
works best if all other conductors are grounded - not as easy on a
pcb.

I think I used frequencies in the low 100's of kHz area.


RP

On 21 November 2016 at 15:23, Harold Hallikainen
<harold@mai.hallikainen.org> wrote:
> 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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