Products > Test Equipment
Brymen BM789
Kean:
--- Quote from: Fungus on October 17, 2021, 02:07:06 pm ---Yep. Calling it "firmware" is a bit of a misnomer. It's more of a ROM.
Brymen sent joe a firmware "update" in the form of a new chip to be soldered in. The calibration was a bit off after he fitted it.
TLDR: Whatever "firmware" you got with the meter is what you get.
--- End quote ---
Nope, it is not ROM.
It can be updated, but only with the right equipment as provided by Brymen - so not by the end user. (at least not yet)
Neutrion:
--- Quote from: vqtrong on October 17, 2021, 01:44:51 pm ---
--- Quote from: Neutrion on October 17, 2021, 11:22:59 am ---That's strange. Can you go back to normal mode without any issues? Do the values change just like if the meter would work normaly? Or what does it do?
I don't want to screw my meter by accidently entering into some calibration mode, though I have the FW version 08.
"D" could stand either for "Dave", or maybe "detonator"? Does it counting back when you activate it?
Just checking whether you can log into the forum a second time...
It's also interesting that it also has the small lightning symbol like some other meter, but it never shows it. Some legal disputes with Fluke?
--- End quote ---
Hi, I'm here ^^ That icon only disappears when turning the dial. Luckily there is no tick-tock sound or any counting-down timer :phew:
--- End quote ---
I am glad that you survived. Brymens are generally safe meters I am sure it would tell us to take cover!
But I still did not dare to try it. What does the display show when the "d" appears? Can you normally measure voltage with it? All the other options are working?
Does anyone know what the processor(not the frontend) of the meter is? If we suppose its one of the Hycons, what could be the price difference to get something with decent memory? (Apart from the current crisis of course) The are plenty of MCU on the market I suppose.
Also interesting why the 789 needs the extra shielding and pots compared to the 786.
And one general question about multimeter backlights: The reason no pwm is used to not to screw the measurements? Because if all the manufacturer are worrying about the power consumption of the backlight, why not implementing a pwm some sort?
AlexTee:
May I ask owners of this lovely DMM to test something for me before I order one for myself?
According to the user manual the continuity test should turn on audible sound if the circuit resistance is lower than 100 Om with response time of 100 μs.
Could you please confirm this statement? Probe a resistor of say 10-20 Om, and see if the buzzer comes on immediately. Because as I figured out recently, not all meters can do that, some turn on buzzer with significant delay if there's a small resistance present.
Caliaxy:
--- Quote from: AlexTee on November 08, 2021, 01:44:19 pm ---According to the user manual the continuity test should turn on audible sound if the circuit resistance is lower than 100 Om with response time of 100 μs.
Could you please confirm this statement? Probe a resistor of say 10-20 Om, and see if the buzzer comes on immediately.
--- End quote ---
Yes, it beeps with no delay up to at least 120 Ohms.
AlexTee:
Nice. Now, the question that still remains somewhat unclear to me is what's the idea behind setting such a high threshold of up to 420 ohm for continuity test. It means I need to throw a glance at the screen every single time I hear the beep, because it might happen to be just a resistor of 200 ohms along the tested path.
I re-read last pages, and found user Fungus explained that this is related to using a very small current in this mode. So, if I understand it right, the small amount of current is the root cause why the threshold is pushed high enough and enclosed in a range for the meter to detect sufficient voltage deviation over the tested path to distinguish between short/open condition. Sounds legit?
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