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Brymen BM789

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joeqsmith:
Sorry,  I don't see the problem. 

***
Are you expect meters will always settle on one read?   


AlexTee:
Just noticed, Welectron is now offering paid firmware update service for BM78x series: https://www.welectron.com/Brymen-BM780-Firmware-Update_1

Has anybody tried this out so far? Specifically, interested in whether the DMM persists its factory calibration after their update procedure?

EEVblog:

--- Quote from: AlexTee on November 17, 2022, 08:52:50 am ---Has anybody tried this out so far? Specifically, interested in whether the DMM persists its factory calibration after their update procedure?

--- End quote ---

Yes it keeps the factory calibration.
They would be using the exact same tool and process that I have.

giosif:
Hi,

Just got my BM789 with a plan to make it my go-to DMM, but I've noticed a few "oddities" (in no particular order):
1. When in Diode mode, sometimes, if I short the probes, I get a short beep, followed by a pause of 1-2 seconds, and only then I get the continuous beep and flashing backlight.
   The other times, the meter starts beeping continuously and flashing the backlight right away.
   In fact, you can kind of see this behaviour in my video below, when playing with the rotary switch.
   Not a big problem, but can still a bit annoying from the perspective of inconsistent behaviour, when you are troubleshooting something.

2. Low battery indicator - as per the video, the threshold for this is different for the different functions.
   For example, I did some measurements and, when in ACV measurement mode, the threshold for displaying low battery is approx. 3.76V.
   At the same time, the threshold for displaying low battery when in DCV mode is 3.58V.
   Is this intended, I wonder (i.e. Brymen feel confident the meter will display accurate DCV readings even with lower battery levels?)?

3. Rotary selection switch - in my brief time spent with the meter (got it only a few days back), it already happened that I wanted to switch to Diode mode and, without connecting the probes to anything, the meter starting beeping as when measuring a short.
   When I looked a bit more carefully, I noticed the rotary switch had ended up between functions (namely, between Capacitor/Diode and Temp).
   Once I set the switch to the correct position, everything went back to normal.
   In the video, I tried to replicate this issue but I had to explicitly try to get it into an intermediate position and try a few times in order to succeed.
   Subsequent attempts seemed to be easier to replicate it, though.
   In any case, given I encountered this under normal use once already, and this in less than a week since I got it, I am concerned it will become a recurring problem.
   Has anyone else encountered this and, if so, how often does it happen to you?

In short, I want to love this meter, but the above, and especially point 3 above, rather puts me off.
Am I being too picky here?

Thanks!

Link to the video - https://youtu.be/kEJgoO0yBYo

giosif:

--- Quote from: giosif on April 23, 2023, 05:55:02 pm ---[...]
2. Low battery indicator - as per the video, the threshold for this is different for the different functions.
   For example, I did some measurements and, when in ACV measurement mode, the threshold for displaying low battery is approx. 3.76V.
   At the same time, the threshold for displaying low battery when in DCV mode is 3.58V.
   Is this intended, I wonder (i.e. Brymen feel confident the meter will display accurate DCV readings even with lower battery levels?)?
[...]

--- End quote ---

Adding to the above, just noticed this mentioned in the manual for the BM789:
"Low Battery: Below approx. 3.7V"
So, that means there is an issue with the meter not displaying the low battery indicator in DCV (Ohms and others as well) until battery level reaches about 3.58V.
Maybe this was addressed in fw version 78911?
Anyone willing to check?

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