On Thu, Jul 14, 2011 at 1:18 AM, David C. Kerber <dker...@warrenrogersassociates.com> wrote: > Hi, electronics gurus - > > We have an application where we need to passively monitor a digital current > loop (no data sending by us), with a data rate of 9600 baud. We already have > solutions for tapping into the circuit, but in some of our customers' cases > the circuits don't have enough drive capability to add another load to it. > So we're looking for a non-loading, and preferably non-contact solution, such > as a inductive pickup or hall-effect pickup, that hopefully wouldn't require > us to break into the circuit. > > Does anybody know of such an animal? If not, it's also possible that we > might contract to have one designed, but that's not decided for sure yet. > It's a fairly electrically noise environment, but not extreme, and the sensor > itself would likely be installed inside an already-existing box on the wall. > The circuit runs at 45mA for the high signal, and the low is <2mA.
Is the current flowing through a length of accessible wire at some point, or is it only accessible in a PCB trace ? If it flows through a length of wire then running it through a current transformer could work well. _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
