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New EEVblog BM786 Multimeter

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EEVblog:

--- Quote from: joeqsmith on February 24, 2021, 01:11:39 am ---
--- Quote from: Pampalini on February 23, 2021, 08:10:16 pm ---
--- Quote from: joeqsmith on February 23, 2021, 01:04:49 pm ---Someone wrote me about the magnetic strap having an effect on the beepers loudness.  I was able to replicate it on all the 78x meters I have.   It's not a small effect.  You can make the audio very faint with it.  Really odd.   I have written Brymen about it. 

I don't use these magnetic hangers often and wonder if there are other meters with a similar problem.

--- End quote ---
Ups... It means I should avoid laying my new BM789 on linear motor or any other magnetic field source :o. I didn't buy magnetic strip only because it was not available yet so my beeper still works. Thanks for the warning.

--- End quote ---
Remove the magnet and the audio level returns.

--- End quote ---

Oh, so it's not permanent damage?

joeqsmith:

--- Quote from: EEVblog on February 24, 2021, 01:44:26 am ---
--- Quote from: joeqsmith on February 24, 2021, 01:11:39 am ---
--- Quote from: Pampalini on February 23, 2021, 08:10:16 pm ---
--- Quote from: joeqsmith on February 23, 2021, 01:04:49 pm ---Someone wrote me about the magnetic strap having an effect on the beepers loudness.  I was able to replicate it on all the 78x meters I have.   It's not a small effect.  You can make the audio very faint with it.  Really odd.   I have written Brymen about it. 

I don't use these magnetic hangers often and wonder if there are other meters with a similar problem.

--- End quote ---
Ups... It means I should avoid laying my new BM789 on linear motor or any other magnetic field source :o. I didn't buy magnetic strip only because it was not available yet so my beeper still works. Thanks for the warning.

--- End quote ---
Remove the magnet and the audio level returns.

--- End quote ---

Oh, so it's not permanent damage?

--- End quote ---
It doesn't appear to be in my meters anyway.  You move that magnet around the sweet spot and you can almost silence the meter.   I tried it with the few larger magnets as well.  Same effect, remove them and the meter recovers.   

EEVblog:
Yep, sure enough:

joeqsmith:
Crazy.  I haven't looked at any others but many of the beepers look similar from what I remember.  It may be fairly common.   

IanB:
If it's a magnetic beeper, then of course a magnet is going to affect it. But when you use a magnetic strap hanger, surely the magnet is supposed to be on the other end of the hanger than the meter? Why is this even worth talking about?

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