On Mar 18, 2013 10:12 AM, <kqt4a...@gmail.com> wrote: > > On Mon, 18 Mar 2013, andy pugh wrote: > > > On 17 March 2013 09:18, <kqt4a...@gmail.com> wrote: > >> I have a need to read dc current > >> 36 volts up to 100 amps "reasonably" accurate > >> I am looking at Tamura L03S100D15 with Arduino > >> I am sure y'all have other suggestions hopefully cheaper > > > > http://uk.rs-online.com/web/p/current-transducers/0259362/ looks cheaper. > > It is also direct voltage output, which might be more convenient. > > > > A bit higher priced for the kit over here > If I make my own boards it would be cheaper > How do I calibrate it
I don't wish to sound flippant but how about applying Ohm's law? I know it seems like a chicken and egg problem to get a known source and a known load but the Internet is your friend. In my case, I think creating a suitable, stable resistance would be reasonably straight forward. The difficult bit for me would be finding a DC supply capable of sustaining 100A but I assume you must have one or you wouldn't be looking for a way to measure 100A. Keep in mind the Hall-effect sensor is current sensitive. 1V is as good as 36V for exciting your test harness with a concomitant reduction in power consumption. Regards, Kent ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
