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BM789 continuity behaviour

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SanFable:

--- Quote from: giosif on October 11, 2023, 10:46:49 pm ---Hi,

Just to provide an update that Brymen did eventually get back to me with an update on changing the response time of the BM789 for continuity mode.
And the change is a hardware modification (which Brymen called a "hack") - using the attached picture as reference:

* R17 & C9 on the factory BM789 are:
  R17: soldered with a 0Ω resistor
  C9: spare (without any capacitor soldered)
* The modification consists of:
   R17: replace the 0Ω resistor with a 25kΩ one
   C9: install a 0.1μF capacitorI have implemented the above modification on my meter and I can confirm the continuity behaviour is now similar to that of other meters mentioned here (e.g. BM257s, 121GW).  :-+
I have asked Brymen and they confirmed this change impacts only the continuity measurements on the meter and no other function.

Hats off to Brymen for looking into this and coming up with a resolution.

--- End quote ---

Great news,

You mention R17 and C9, in the picture we can see marked R12, any idea why it got marked too?
Did you miss something?

Neutrion:
That is a good question. I hope giosif will get back to them.

giosif:

--- Quote from: Neutrion on October 17, 2023, 11:59:34 am ---I hope someone does the mod to test it before me. :)

--- End quote ---
As I mentioned in my previous post, I have already implemented this mod and it is working "as advertised".


--- Quote from: Neutrion on October 17, 2023, 11:59:34 am ---Also not sure if one can access the parts properly because of the can on the 789 what the 786 doesn't have. Don't have picture in front of me of its guts.

--- End quote ---
Yes, I had to desolder the metal shield covering the part of the circuit where this mod needs to be applied.
However, the shield is soldered to the board only in a couple of locations, so it's not that painful to remove.


--- Quote from: SanFable on October 19, 2023, 09:13:10 am ---You mention R17 and C9, in the picture we can see marked R12, any idea why it got marked too?
Did you miss something?

--- End quote ---
The picture I attached came directly from Brymen, so don't know why R12 is marked as well.
In any case, this modification doesn't touch R12.

tor47h:
BM786 - I had the same problem.
R17 25k + C9 100nF = excellent and correct solution  :-+
Thanks for sharing.

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