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Brymen BM 235 Startup issues
derree:
Hi everybody!
I am a hamradio and general electronics enthusiast and quite happy with my Brymen BM 235, at least until 2 weeks ago.
I always used rechargeable AAA batteries (eneloops) in all of my multimeters, never had a problem. The BM 235
seems to stay stuck in the startup process, means when I switch from "off" to a function, the LCD shows all segments as black (which is normal for about half a second), but the device never pulls through to the selected function. The display stays in the state of all segments black.
I suspected the eneloops to cause this, as they by default have a voltage of 1,2V, whereas alkalines have a voltage of 1,5V, which I suspected to make problems during a phase of higher power requirements during startup of the multimeter.
It seems to be better, but now and then the BM 235 shows this behavior.
Has anybody an idea what could cause this problem?
all have a nice day!
Derree
Specmaster:
A simple way to test your theory is to replace the eneloops with conventional alkalines and see how it behaves. I think you might well be right as a rechargeable has a maximum voltage of 1.2V whereas a alkaline is around 1.6V so with a new set of batteries you are already .8V lower and I believe that the alkaline is capable of supplying a larger starting current.
wraper:
--- Quote from: Specmaster on January 01, 2020, 11:29:30 am ---I think you might well be right as a rechargeable has a maximum voltage of 1.2V whereas a alkaline is around 1.6V
--- End quote ---
BS, freshly charged NiMH has around 1.45V voltage but fresh alkaline around 1.55V. Nonetheless even at 1.2V per battery meter must work fine unless it's faulty.
wraper:
Specmaster:
--- Quote from: wraper on January 01, 2020, 11:37:36 am ---
--- Quote from: Specmaster on January 01, 2020, 11:29:30 am ---I think you might well be right as a rechargeable has a maximum voltage of 1.2V whereas a alkaline is around 1.6V
--- End quote ---
BS, freshly charged NiMH has around 1.45V voltage but fresh alkaline around 1.55V. Nonetheless even at 1.2V per battery meter must work fine unless it's faulty.
--- End quote ---
Just taken a new AAA alkaline from a sealed pack and it measures 1.595080V so it is much nearer to 1.6V than it is 1.5V, also the maH capacity of alkaline is higher than a eneloop, typically 1,200maH alkaline as opposed to 800maH of a eneloop. Reference is from Wikipedia
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