piclist 2007\03\20\130339a >
Thread: [PIC] Clamp-Ammeter
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face picon face BY : Alan B. Pearce email (remove spam text)



>For sure,rms of induced voltage will be much smaller than
>the rms of input current.

Umm, I think you have a problem with mixed units. You need to think in terms
of the current coming out of the secondary of the coil as being proportional
to the input current. They will be related by the number of turns on the
secondary (think of the primary as being one turn, and remember you cannot
have part turns on a toroid).

>Ok.The potential problem is I am expected to build this ammeter
>with at least 4 digits  precisiton after the coma.

What temperature range will you have? I have some doubts you will manage
that many digits of measurement precision without some fancy temperature
handling. You also do not say what your current range is.

<08b501c76b11$a85d2080$1979f682@space.rl.ac.uk> 7bit

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