Products > Test Equipment
Brymen BM789
c0d3z3r0:
--- 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
NoMoreMagicSmoke:
--- Quote from: c0d3z3r0 on September 23, 2022, 12:46:45 am ---
--- Quote from: NoMoreMagicSmoke on September 23, 2022, 12:44:21 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 ---
That's something completely different than the bug that was recently fixed. Does it ever change from 0 ohms?
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I don't think so. For me this happens around 660 Ohms. Yes, it changes, when either changing the resistor value or when range switching works - each 3-4th doesn't...
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This is very interesting. Any chance of posting a video?
joeqsmith:
--- Quote from: floobydust on September 22, 2022, 04:34:28 pm ---I thought Joe was blowing up the DMM IC U1, not the MCU U16?
Doesn't matter really, the firmware is cast in stone unless you want to ship it across the ocean. Brymen could have trusted agents in North America do F/W upgrades, repairs... or maybe not due to their obligations as an OEM which prevents them from selling here.
Could look at the Andes programmer but you'd still need the binary.
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As for blowing up ICs with both the Brymen BM786 & BM789, I suspect that thin Canada air causes hallucinations. I pushed the prototype BM786 to failure (12kV peak) in the following video and damaged Q4. The set was replaced and I continued my testing of the meter. Because the two meters share the same front end, I only ran the BM789 on the 6kV generator. Personally I consider meters that have protection circuits that limit the amount of damage to allow repairs a big plus. Consider that the $600+ Keysight meter I just looked was damaged beyond repair at 5kV.
Damaging the Brymen BM786 prototype at 12kV and then repairing it by replacing two transistors:
Damaging the Keysight U1282A at 5kV and taking out several IC, some custom.
joeqsmith:
--- 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.
--- 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.
c0d3z3r0:
--- 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.
--- End quote ---
Thank you. I already sent them a message. I guess that will take some days.
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