Products > Test Equipment
Brymen BM 235 Startup issues
Specmaster:
@wraper Next time I go to Ikea I'll grab some AA's and give them a try then and see how I get on with them.
Miti:
--- Quote from: derree on January 01, 2020, 11:10:59 am ---
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.
--- End quote ---
A phase of higher power during startup? Why would that be? I don't expect that instrument to draw more than 10-15mA, unless it is defective.
A short inrush current to charge some capacitors, if at all, shouldn't be a problem either.
I have an old Protek HC81 that does exactly that if I push a button right after the power on, during the display test phase. It stays there with all the segments turned on, until I release that button.
Can you try the same thing with the alkaline batteries? Just push any button during the display test and see if you can duplicate your issue.
You may have some dirty button contacts, or some moisture.
derree:
--- Quote from: Miti on January 03, 2020, 02:50:34 am ---
--- Quote from: derree on January 01, 2020, 11:10:59 am ---
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.
--- End quote ---
A phase of higher power during startup? Why would that be? I don't expect that instrument to draw more than 10-15mA, unless it is defective.
A short inrush current to charge some capacitors, if at all, shouldn't be a problem either.
I have an old Protek HC81 that does exactly that if I push a button right after the power on, during the display test phase. It stays there with all the segments turned on, until I release that button.
Can you try the same thing with the alkaline batteries? Just push any button during the display test and see if you can duplicate your issue.
You may have some dirty button contacts, or some moisture.
--- End quote ---
Hi,
I already tried that, pressing some of the buttons during startup with both, alkalines and eneloops. Same result: 2 times of 10, the meter with eneloops is stuck in the boot process, with alkalines the meter pulls through every single time.
I have to correct myself, the eneloops are older than a year, it was my second batch bought in September 2017, so we are talking about 2 years now. My fault!
Specmaster:
Any idea how many times they were recharged during that time? So far my experience has shown with batteries that have been recharged 2 or 3 times and then not used for while fail next time they are charged with error codes on the battery charger. Whereas alkaline batteries are quite happy with periods of non-use Ni-MH arent.
wraper:
--- Quote from: Specmaster on January 03, 2020, 10:36:05 am ---2 or 3 times and then not used for while fail next time they are charged with error codes on the battery charger
--- End quote ---
Sounds like your charger is (probably faulty) crap. It's your charger what fails, not batteries :palm:.
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