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Brymen BM789

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EEVblog:

--- Quote from: NoMoreMagicSmoke on August 07, 2022, 07:59:49 pm ---
--- Quote from: Antrus on August 07, 2022, 03:50:54 pm ---Try measuring the variable resistor. In the range of 650-660 ohms in automatic mode, he goes crazy.

--- End quote ---

I wonder if this is an issue with just some meters? I just tried with a potentiometer and s sweep from 600-700 6.0k - 7.0k could not cause the meter to freak out. My meter is 08 and it ranges up at 66000 counts and down at 61000 counts.

I did only have a 1 turn pot available though so it's possible it's a very narrow range and I didn't have the resolution on the potentiometer to hit the sweet spot.

--- End quote ---

No issue at all on a new BM786 with 78608 firmware, or 78607 using my decade resistance box. It's just rock solid at 0.65x display.

joeqsmith:

--- Quote from: EEVblog on August 09, 2022, 11:54:22 pm ---
--- Quote from: NoMoreMagicSmoke on August 07, 2022, 07:59:49 pm ---
--- Quote from: Antrus on August 07, 2022, 03:50:54 pm ---Try measuring the variable resistor. In the range of 650-660 ohms in automatic mode, he goes crazy.

--- End quote ---

I wonder if this is an issue with just some meters? I just tried with a potentiometer and s sweep from 600-700 6.0k - 7.0k could not cause the meter to freak out. My meter is 08 and it ranges up at 66000 counts and down at 61000 counts.

I did only have a 1 turn pot available though so it's possible it's a very narrow range and I didn't have the resolution on the potentiometer to hit the sweet spot.

--- End quote ---

No issue at all on a new BM786 with 78608 firmware, or 78607 using my decade resistance box. It's just rock solid at 0.65x display.

--- End quote ---

That's odd.   I had to hunt for it but was able to find a spot were the 789 will hunt indefinitely as suggested by the OP.   


joeqsmith:
I should add that the 789 shown was the last meter I tested which had been setup at the factory.  It is not one of the meters I had swapped parts on.

Also, maybe a bit more to the story.  Looking at one of the 786 meters, w/ 78605 which had modified with the latest parts of that time, does not exhibit this problem. 

As I mentioned, I had forwarded this information to Brymen.   

GAVER:
I confirm the problem.78909

EEVblog:

--- Quote from: joeqsmith on August 10, 2022, 01:19:19 am ---I should add that the 789 shown was the last meter I tested which had been setup at the factory.  It is not one of the meters I had swapped parts on.
Also, maybe a bit more to the story.  Looking at one of the 786 meters, w/ 78605 which had modified with the latest parts of that time, does not exhibit this problem. 
As I mentioned, I had forwarded this information to Brymen.

--- End quote ---

The 786 and 789 firmware bases are different. Possible it exists in one and not the other.
I've gone up by 1 ohm increments from 600ohm to 680ohm and there is no problem.

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