Products > Test Equipment

Brymen BM786 - Case cracking

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joeqsmith:

--- Quote from: EEVblog on December 14, 2024, 03:31:08 am ---First I've heard of that. I might have a parts unit front face moulding somewhere.

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I have one of their non-working prototypes with a good case if you want it for destructive testing.   

AVGresponding:

--- Quote from: joeqsmith on December 10, 2024, 09:40:31 pm ---
--- Quote from: floobydust on December 06, 2024, 06:58:24 pm ---My wild theory is the cracking is due to different thermal expansion coefficients between the two plastics - the cast acrylic display window and the multimeter enclosure. To keep it sealed, the window is glued in place, rigid. So I would imagine high strain along the edge axis.
...

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I would have thought they used the same plastic.  I did run a fair amount of thermal tests on various meters, including shock.  If it is a TC, I'm surprised none of them cracked. 

My guess is ozone machines.

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If it is related to thermal expension, it might be marginal enough that it requires quite a lot of cycles.

Easy enough to ask Mpegger and Antrus if they use ozone generators.

sonpul:
I suspect that over-tightening the housing screws may cause unnecessary stress on the materials used. This may not be the main reason for the cracks that appear. But this can be a strong provocation.

Wrenches of Death:

--- Quote from: sonpul on December 15, 2024, 04:35:13 pm ---I suspect that over-tightening the housing screws may cause unnecessary stress on the materials used. This may not be the main reason for the cracks that appear. But this can be a strong provocation.

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Good idea! You might have somemthing there. I just eased off of all eight screws on the backside of mine. Thanks!

WoD

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