Finding an open on pcb

I have a meter that tracks down short circuits on circuit boards but I
was wondering if there was something that can trace a open circuit
down. What I am trying to do is follow traces on a circuit board and
see where they lead. The go from top to bottom and run all over the
board. The short circuit device lets you follow the trace on the
board. You don't have to actually touch the trace just move the tip
around over the top of the board. It injects a AC signal and that is
what you are following. But with an open a AC signal won't show. I
think I am missing some simple and obvious here. But if not, is there
a way to do this.
Thanks
Russ

.

Quantcast