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"Jeff Wisnia" <jwisnia@xxxxxxxxxxxxxx> wrote in message
news:zLydnZVzrJEpLYfYnZ2dnUVZ_tWdnZ2d@xxxxxxxxxxxxxxxxx
> I believe the ammmeter is what I used to know as a "moving iron" type, and
> IIRC the restoring force was supplied by some kind of permanant magnet
> field, not by a mechanical spring. Am I right about that?
Nope. Still a spring.
http://www.tpub.com/content/doe/h1011v4/css/h1011v4_76.htm
Moving iron vane - The moving iron vane meter operates on the
principle of magnetic repulsion between like poles. The measured current
flows through a field coil which induces a like magnetic field into
a fixed and moving vane causing the moving vane to deflect a
pointer in proportion to the current or voltage applied to the coil.
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