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UT210E Problem measuring AMPS!!! :(

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joeqsmith:
When I show the degauss coil, it is clearly a decaying AC magnetic field.  You ask about placing it next to a large magnet overnight and suggest the auto power down is part of the problem.  Knowing that you didn't understand that magnetic fields can alternate gave me some idea on how to try and answer in terms I thought you may understand.  After seeing the disk drive, it seems you now understand this part.   Trying to make the field mechanically could be done but it's just easier to use the 50/60Hz line to create it.   Again, you could decay the field by slowly moving the clamp out of it, or electronically as I have shown.  If you used an old tape eraser, you would do this by hand, waving the eraser while moving it away from the clamp.   

I suggest never trying to take the meter apart and certainly not adjust the pots.  These are a pain to get set right.  The one pot is really sensitive.     

Using this clamp with an RC toy using brushless motors may not work, depending where you are trying to measure.   

Personally, I would just invest in a real degauss coil instead of messing around with these disk drive magnets.   Then you will have it for the next time.   My old Tektronix clamp has the coil built in.  It's a nice feature. 

marce002:
ok, i dont have a tape bulk eraser but might get a microwave transformer easily... i can modify removing the secondary but i thing will be closed in shape (Not an E right?)  the HDD was just an experiment but did not work for the clamp, worked fine for screwdrivers though (magnet and demagnet them). So Joe, can ido something useful out of a microwave transformer?

FUNGUS

you said Switch it to 5A and wave a strong magnet near it to see if if goes down towards zero (try both poles of the magnet).

When it's near zero, switch to 2A and repeat.

i did, i get a perfect 0.000, then I switch to 2A and it is close to 0 too, but doing it forever I think wont solve the offset at all.


thanks for more ideas

joeqsmith:
If its a laminated core, you could take it apart.  Unwind the secondary, separate the laminates and modify them to form an "E"   

It may be less work to make one from scratch. 

marce002:
thanks Joe, i will be doing this procedure becasuse the microwave is almost here, and saw videos to make an E removing de secondary yes... I will be placing the clamp by hand a few cm from the center of the E , and then moving apart from the field in upwards direction....  sound reasonable?

joeqsmith:
You will have to play around with your technique once you have it built.     

That's going to be a lot of work.  I would make sure the meter is at least working before you spend too much time on it.   Again, you should be able to get it close enough with a magnet to at least zero it out.   

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