As long as you have access to a single wire and not the return path! :)
Andy. signality.co.uk On 13 July 2011 22:48, Stephen Ecob <silicon.on.inspirat...@gmail.com> wrote: > 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 > _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
