Products > Test Equipment

Brymen BM789

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HAO:
Hi everyone. I have BM869s and BM789. Both meters have not good battery life.

BM869s :
Power Supply: Single Alkaline 9V battery
Power Consumption: 6.5mA typical; 8mA for VFD ranges
Low Battery: Low Battery: Below approx. 7V

BM789
Power Supply: 1.5V AAA Alkaline battery x 3
Power Consumption: 10mA typical for AC & AC+DC Voltage/Current functions; 8mA
typical for other functions
Low Battery: Below approx. 3.7V

Do they work well with NiMH cells and not show low battery indicator?
AAA Eneloop for BM789
Energizer NH22-175 or Ansmann Akku 9V 300 mah for BM869s.

I also have Fluke 87V and Fluke 117. Should I stay with Energizer, Panasonic Alkaline or switch to rechargeable batteries ?

joeqsmith:

--- Quote from: HAO on December 07, 2021, 05:36:31 am ---Hi everyone. I have BM869s and BM789. Both meters have not good battery life.

--- End quote ---
So far, the best meter I have looked at for battery life was the free meters we get from HF and the Fluke 17B+.  I estimate both around 1200 hours.   Much better than the two meters you mention.  The worse I have seen was the UNI-T UT181A.  Maybe 40 hours between charges on a new battery, and the meter can't be used when it is charging which is done overnight.   

I have been using rechargeable Lithium-ion batteries with the BM869s.   The ones I have are marked 600mAh.  I've not had any problems using them. 

EEVblog:

--- Quote from: vqtrong on October 17, 2021, 02:04:55 pm ---Searching around, I found a post from Cymaphore
https://www.eevblog.com/forum/testgear/new-eevblog-bm786-multimeter/msg3625880/#msg3625880
in which he said "Data port for BT is present under the display but unused in the standard BM789."

Have seen anyone hacked to that data port :palm:

--- End quote ---

Not possible because the firmware does not output and signal you can use.
I requested this way back in the development of the meter, saying it would be a popular user retro-fit, and Brymen agreed. But they couldn't get it done for some reason and the feature was not implemented.

Antrus:
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.

Grandchuck:
Sounds like capacitance is involved?

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