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Brymen BM789

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YulyPH:

--- Quote from: sonpul on August 06, 2024, 02:57:19 pm ---I am pleased with both the brightness and duration of the BM789 backlight.
But I always wanted to have a mode so that the backlight would turn on itself immediately and turn itself off after 15 minutes.
Any ideas on how to implement this?

I have always said that the BM789 was created very well. What would you notice about the long backlight time, AutoHold, easy-to-read display and much more

--- End quote ---

It's hard to read the display with light glare and awkward positions without backlight so I need always on backlight.
Implementing a custom pcb for the backlight is a possibility but the compact nature of the meter kinda limits what you can stick inside.
Even if you do implement a custom solution there needs to be a reset for the timer (reuse a push button but lose the functionality of the meter for that button) otherwise you need to turn off/on the meter every 15 minutes.
The simplest solution is to have always on display with limited current. Even with 500R resistors there isn't much of a difference in backlight.

The quality of the display in BM789 is good and exactly the same as BM869s but with bigger digits. The display on BM829s looks kinda bad compared to the other two. All of them lose in top viewing angle.
Auto hold is useless on fluctuating mains but I guess any fluctuating voltage source (It jumps all over the place).
I do mains work on occasion so the live finder is quite useful as in my country mains wires don't have a fixed position for live/neutral in the sockets or even a specific color for the wires  :palm:.
Love brymen meters for having DC and AC low-z as it is very useful for discharging caps and detecting devices that have a bit of leakage (you don't need custom value resistances).
Also the speed of the BM789 is unlike anything I ever had the pleasure (or not  :)) of using.
You might think BM869s is slow but it is actually second in speed.
BM829s was the fastest I experienced but with the above 2 it takes thinks to another level.


--- Quote from: Fungus on August 06, 2024, 06:29:42 pm ---
--- Quote from: YulyPH on August 05, 2024, 06:25:10 pm ---BM869s seems like a mistake as BM789 is better for AC voltage (more accurate voltage up to 100kHz - both meters go higher than that) and the readings are way faster (BM869s needs a few seconds to stabilize).

--- End quote ---

I use an oscilloscope for anything "AC" that isn't mains voltage.

--- End quote ---

I also use a scope for visualizing the waveform even on mains (battery powered scope) but it takes time to boot up the scope and sometimes you may need a quick value to see that it works (smps power supplies for example)

Dual display becomes irrelevant with two meters sooo anyone wana trade a BM789 for my BM869s  ;D ?

J-R:
A use case can get specific enough to make one DMM an obvious choice over the other.  But I'd maintain that the BM869s is better for bench use in general.  Dual display and IR interface for starters.  Also, the calibration procedure is known, so you can really dial in the 500,000 count modes.  NCV, AutoV and Low Z are not typical on the bench, more household/industrial.  Anything where the frequency performance matters should go to the scope.

When away from the bench, those features really are handy, so the BM789 is easily the winner.  Although, some of UEi's DMMs with Bluetooth have been handy.

EEVblog:

--- Quote from: J-R on August 08, 2024, 12:55:13 am ---A use case can get specific enough to make one DMM an obvious choice over the other.  But I'd maintain that the BM869s is better for bench use in general.  Dual display and IR interface for starters.  Also, the calibration procedure is known, so you can really dial in the 500,000 count modes.  NCV, AutoV and Low Z are not typical on the bench, more household/industrial.  Anything where the frequency performance matters should go to the scope.
When away from the bench, those features really are handy, so the BM789 is easily the winner.  Although, some of UEi's DMMs with Bluetooth have been handy.

--- End quote ---

The BM780 series is designed as a direct competitor to the Fluke 170 series. It's almost indentical in shape and look, and includes the more "electrical" features of NVC and LowZ.
The BM869 is clearly designed as a high end lab meter.
Nothing mysterious here at all, just basic market segmentation.

J-R:
The feature set between the BM78x and Fluke 17x doesn't align well enough for me to believe that it was "designed as a direct competitor".  The BM235 matches better.  It seems more likely that marketing wanted a story to tell and to be able to say "Fluke" during presentations.

YulyPH:
Bench use, so what exactly does this mean for you ? For me it's troubleshooting, improving stuff,  basic experimentation and I guess for many more.
I do watch quite a bit of youtube channels and apart from learning channels I really don't see anyone have a need for PC communication/logging.
Some even use basic bottom of the barrel meters because they need a quick value then move on with there lives.
I you mean lab use then that is another thing entirely and BM869s might be just a starter pack.

People here are starting to agree that the scope is better for AC so what is left for dual display meters ?
Diode, continuity, and DC don't need dual display, maybe capacitance for ESR but I don't see any DMM have this feature.
Don't get me wrong I would like a display with as much info as possible but if it means compromising on other features than I take the single display.

Considering low-z a feature for electricians is just wrong.
You wouldn't want an electrician to work on your electronics.
I have interacted with many electricians and none of them had a meter with low-z or even know what to do with it.
Electricians like stick meters with a few leds because a number on a screen is to much and I agree with them, measuring voltage thousands of times a day becomes irrelevant if it's 220 or 230.

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