Products > Test Equipment
BM869S not reading correct voltage
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joeqsmith:
That's all I ever used. 
radiolistener:

--- Quote from: robert.rozee on July 13, 2024, 01:51:24 am ---from your results i'm rather suspicious that all your leads have been 'stretched'; when a multistranded cable is stretched it is possible for every strand to be broken, but each in a different location down the length of the cable. the result is that while the cable may appear to have end-to-end continuity at first, over time as oxidization occurs due to moisture ingress the cable becomes highly unreliable. it could well be that the sheathing Bryman uses happens to be particularly susceptible to moisture ingress in high humidity environments.

--- End quote ---

In my case the leads was never stretched and it was stored in ideal home conditions (about 20-25°C and and dry air, no moistures and chemicals in the room), I used them very carefully and wiped the gold needles with cotton wool and 95% ethyl alcohol.

But my new golden plated Brymen leads, just out of the box, was about 0.09Ω which is twice worse than these Chinese leads which is about 0.04Ω. And my Brymen gold plated leads going worse and worse with time despite the rare and careful usage.

Now they are lying with no usage in the box, because I use Chinese leads. Periodically, just out of curiosity, I check the Brymen leads and they show a stable high resistance degradation over time. Their current resistance is about 10Ω...

I'm almost sure these leads was developed with some hi-technology which allows to get so bad resistance degradation over time, because I never seen such effect on any kind of leads. So, I think they using some kind of nano-technology materials which allows to get so high and quick resistance degradation, probably in order to make leads unusable after 1 year, so the user will go to shop to buy a new replacement... Why I think that they using some kind of hi-tech nano-technology? Just because I can’t even imagine how it’s possible to deliberately make probes with such degradation over time effect...

But thanks to Chinese guys, they make cheap leads which has a little worse initial resistance, but their resistance is very stable and don't change over time...


Regarding to the Brymen DMM itself, it works. But it has high sensitivity to a static electricity, there was some strange effect when I peel the protection film from the display - when I put my hand near display, it leads to DC voltage spike and LCD segments flashing. This effect was very high when I tried to put a plastic pencil near display. LCD segments was flashing even when DMM was powered off. Probably some issue with shielding and plastic material properties. After years, it still has static electricity effect, but now it is a little bit less visible (maybe because I'm used to it).
radiolistener:

--- Quote from: LDDM on July 17, 2024, 04:53:30 am ---Sent an email to the only email i could find on Brymen.com (info@brymen.com)

Check everywhere could not find any support email. If someone know the support email for Brymen Taiwan, would greatly appreciate if you could share it.

I will update this post if i get any reply.

--- End quote ---

I contacted with Brymen using info@brymen.com, but they can't help with leads issue, they propose to ask help from seller, so if you bought it on internet shop which don't have after sale warranty, then there is no warranty at all...
floobydust:

--- Quote from: radiolistener on July 17, 2024, 07:11:43 am ---[...]
Regarding to the Brymen DMM itself, it works. But it has high sensitivity to a static electricity, there was some strange effect when I peel the protection film from the display - when I put my hand near display, it leads to DC voltage spike and LCD segments flashing. This effect was very high when I tried to put a plastic pencil near display. LCD segments was flashing even when DMM was powered off. Probably some issue with shielding and plastic material properties. After years, it still has static electricity effect, but now it is a little bit less visible (maybe because I'm used to it).

--- End quote ---

What are you talking about, 80% humidity tropical environment has pretty much nothing for ESD. Activating LCD segments with static charge takes a very high level electric field and the multimeter must be connected to something big, not just sitting there by itself.
Your bench might have a problem. Laminate flooring is the worst or that composite wood benchtop in the pic.
It's normal the DCV jumps around when handling any multimeter. "Segments flashing" I have no idea what that looks like, is that the bar graph? They can only flicker due to being floating i.e. driver IC output is not working, as in the multimeter is powered off or maybe a firmware error does not properly turn off annunciators/segments but that's something that can be tested.

High humidity causes oxidation and corrosion, I would suspect the rotary switch or interconnects (headers).

I think a question at hand is if Brymen TW offer any support - repair, cal, parts etc. after warranty.
radiolistener:

--- Quote from: floobydust on July 17, 2024, 08:10:18 pm ---Activating LCD segments with static charge takes a very high level electric field and the multimeter must be connected to something big, not just sitting there by itself.
Your bench might have a problem.

--- End quote ---

This is not bench, this is Brymen DMM issue. It very sensitive to static electricity, due to properties of DMM case plastic materials. It works like electric machine, producing static electricity when you touch transparent plastic window over Brymen DMM display... You can touch it with finger, in that case you can even feel static electricity on transparent plastic window surface and its discharge to finger leads to LCD segments flashing. Other equipment don't have such effect, only Brymen DMM. And it has this electrostatic effect in different rooms and different environment conditions. Just touch DMM display and you can see it's DC measurement spikes...

I think this issue is present only on BM867 model, because it don't have shielding as BM869
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