Bill, I haven't used a Hall device is series for measureing current. I asked the question about series resistance because that application was mentioned during the slides on using Hall devices with a fixed magnetic field present.
rswanson: I have used Allegro ACS713 series devices that include the current conduction (metal bar) path internally in the IC for super ease of use and I believe much more accuracy. It's series resistance spec is about 1.2mOHM
Hydrogent--the answer is the usual: it depends. It depends on the distance, oritentation, etc. But remember--a toroidal coil is (in theory) ontl affected by the field within, not outside of the toroid.
Suzie--I will look for sources on higher current--but usually the transducer vendors have very good app notes. And there are also regualtory standards which you don;t have to follow, but may be worth a look at.
It appears that the answers go only back to the ouestion submitter. That is a disappointment as it would be possible to learn if we all could see the responses. This feature and yeaterday's troubles make this course of much less value than it could have been.
One question that I have concerning shunts. We have various values of bar shunts here at our lab that we use for measuring current levels from 10a to 5000a. Is it necessary to actually prove the resistive value at various temperature due to self-heating, or is it acceptable to use thermal coefficients from the manufacturer? Also, in dealing with the high current, it is also important on the physical connections and orientation of the connections. Do you have any good sources of information on this topic?
One thing I've encounter quite often with Hall Effect sensors used in the AC/DC type current probes you mentioned is the DC zero value is often drifting/shifting. You must have a means of nulling the "zero" point.
A middle school team from Rochester, Mich., has again nabbed the grand prize in the annual international Future City Competition, which drew students from 37 regions of the United States, as well as from England and China.
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