Products > Test Equipment
Brymen BM789
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NoMoreMagicSmoke:

--- Quote from: c0d3z3r0 on September 23, 2022, 08:18:09 pm ---
--- Quote from: joeqsmith on September 23, 2022, 02:33:34 pm ---
--- Quote from: c0d3z3r0 on September 23, 2022, 12:51:28 am ---
--- Quote from: Monkeh on September 23, 2022, 12:45:30 am ---
--- Quote from: c0d3z3r0 on September 23, 2022, 12:40:15 am ---Well, my BM789 simply shows 0 Ohms then. I wouldn't call that *obvious*. Also, when pressing "RANGE" it sometimes simply turns off completely...

--- End quote ---

Err, that is not the described fault, and shutting off when changing range is not normal either.

--- End quote ---

A different symptom, but probably the same bug

--- End quote ---

Agree with Smokey the Bear, make a short video showing the behavior.   If you have found a new problem and I am able to replicate it, there is a good chance we could work with Brymen to address it.   

--- End quote ---

Sure, I made a video now. There are two things you can see 1) weird jumping of the measure value after a second or so and 2) now random resetting of the DMM when switching through ranges, instead of turning off o.O
https://www.veed.io/view/261c54f7-b4a1-4e5e-89cc-e05c4cb08251

Fun fact... I am unable to reproduce the 0 Ohms readings anymore. I should have filmed that earlier :-//. However, the resetting behaviour got worse as you can see. This *only* happens around 66x Ohms (666...  >:D).
1 happens regardless of the resistor value, but seems unusual to me and I never saw such thing with other DMMs, what do you think? Here's another video of that:
https://www.veed.io/view/e9a4ccda-ac7c-4aba-a357-9880bcae5435


--- Quote from: joeqsmith on September 23, 2022, 02:33:34 pm ---
--- Quote from: c0d3z3r0 on September 22, 2022, 11:48:21 pm ---@joeqsmith @EEVblog is 78911 the most recent firmware?

--- End quote ---
As of three weeks ago when I posted that last video it was.  I'm not a distributor and am in no way affiliated with Brymen.  The only way for you to know for sure would be for you to ask them.

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Thank you. I already sent them a message. I guess that will take some days.

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I agree with he others that said get a replacement. Looks like you light have gotten a dud
c0d3z3r0:

--- Quote from: Antrus on January 04, 2022, 06:53:57 pm ---Greetings to all. I have a question about measuring resistance with this multimeter. At first it shows a slightly lower value, after a second the final one. Is it so for everyone? Firmware 78908.In reviews, he showed the value immediately.

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--- Quote from: J-R on August 22, 2022, 08:34:25 am ---Couldn't reproduce the issue on my 78905 at any of the range transitions.

~655.xx does show as 0.622xx for a full second before settling on 0.655xx.  Also noticed the same behavior if you switch to mV and back at that approximate value.

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So, I am no the only one...


--- Quote from: floobydust on September 23, 2022, 10:32:21 pm ---Pressing the Manual range button might just be aggravating a bad connection inside. See if it's the rotary switch, try applying some pressure, a gentle squeeze to the switch instead.

--- End quote ---

As I said, this *only* happens around 660 Ohms.


--- Quote from: joeqsmith on September 24, 2022, 12:15:03 am ---
I only saw the one value in the video.  Odd it wouldn't reset like this with other values as it seems like a mechanical problem.    Sorry but I wasn't able to replicate it with the meters I have.

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Check the second video. There's two values, as described by J-R.

How can a mechanical problem be tied to a specific value? ;-)

Anyway, I alread had contacted Welectron. Let's see what they come up with next week.

Just to clarify, I don't want to blame Welectron for that Problem, I'm sure they'll give their best to solve this :-)
joeqsmith:

--- Quote from: c0d3z3r0 on September 24, 2022, 09:27:24 am ---
--- Quote from: joeqsmith on September 24, 2022, 12:15:03 am ---I only saw the one value in the video.  Odd it wouldn't reset like this with other values as it seems like a mechanical problem.    Sorry but I wasn't able to replicate it with the meters I have.

--- End quote ---

Check the second video. There's two values, as described by J-R.

How can a mechanical problem be tied to a specific value? ;-)

--- End quote ---

Both videos show 664 ohms.  There was nothing shown that suggests the meter would behave differently with another value.   If it is tied to a specific value as you suggest, I would suggested leaving the leads open or shorted to show that. 

So yes, it appears like a mechanical problem to me. 
c0d3z3r0:

--- Quote from: joeqsmith on September 24, 2022, 02:38:30 pm ---
--- Quote from: c0d3z3r0 on September 24, 2022, 09:27:24 am ---
--- Quote from: joeqsmith on September 24, 2022, 12:15:03 am ---I only saw the one value in the video.  Odd it wouldn't reset like this with other values as it seems like a mechanical problem.    Sorry but I wasn't able to replicate it with the meters I have.

--- End quote ---

Check the second video. There's two values, as described by J-R.

How can a mechanical problem be tied to a specific value? ;-)

--- End quote ---

Both videos show 664 ohms.  There was nothing shown that suggests the meter would behave differently with another value.   If it is tied to a specific value as you suggest, I would suggested leaving the leads open or shorted to show that. 

So yes, it appears like a mechanical problem to me.

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The second video *clearly* shows 0.6401, then 0.6639 - exactly as both J-R and Antrus already described.

Ahh, I see, you don't believe anything you haven't seen on a video. Got it.....
Then watch this - no mechanical problem! https://www.veed.io/view/1b8810ab-a6ca-44b4-90ac-27d78e7bf110

(Now you tell me, that you don't believe it's one and the same DMM? *scnr*)
joeqsmith:
Notice you removed the leads, adding one more variable to the mix.  Also the technique changed along with where you were pressing.   True, I don't know what firmware was installed on this meter.  Was it indeed different?   
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