Re: AVO Multimeter survey
My previous attempts at fixing Low Flux movements, have mostly centered around
trying to re-magnetize the Magnet.
To date, I have never been able to return any movement Magnet to a normal condition.
I have played around with Neodymium magnets, but again, results have been poor
together with the unwanted visual appearance.
I like repairs to be as invisible as possible.
This Morning, I was playing around with some very small Neodymium Magnets I bought
a couple of years ago, and actually had some success.
I have managed to restore the 1 mA Movement, to guess what? 1 mA.
When the movement is bolted back in to the Meter, the Neodymium Magnets should be
virtually invisible.
Points of note are:
The Magnetic Shunt has a much smaller effect, so most of the adjustment needs to be
carried out with the Neo's.
Also, I found it was important to have the Neodymium's attached in such a way that they
are magnetically attached to the ends of the Horseshoe, but they must be repelling their
neighboring Neo's. Otherwise, it seems to reduce the Flux improvement.
I haven't re-searched what's going on Magnetically here yet.
The Magnets I used are N52 (6mm x 2mm ) Discs.
4 on each side have returned the movement to functionality, although, it will need striping
down for proper cleaning before it goes back in.
I have not needed to glue these in, They are held on with their own magnetism.
Ian
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