| Products > Test Equipment |
| Brymen BM867s ??? |
| << < (3/17) > >> |
| radiolistener:
--- Quote from: Fungus on May 03, 2021, 10:30:20 am ---Edit: Get gold probes for your Brymen, too. They're only 10 Euros and well worth it. --- End quote --- In my experience, Brymen probes are crap. My Brymen probes has 0.08-0.16 Ω when I bought it with my BM867S and now, after 2-3 years of rare usage at home conditions it has floating 0.2-0.4 Ω. I tried to clean its banana plugs with rubber and ethanol, but it doesn't help. The only way to restore 0.08 Ω is to move and pull the wire near banana plugs, at some position it returns to 0.08 Ω, but if I leave it for some time, it returns back to floating state with 0.2-0.4 Ω. It looks that there is a bad contact between wire and banana plug inside plastic. For example, just tested them - 0.51 Ω. :-- I asked Brymen why it happens and they said the following: --- Quote ---For reliability, our test lead design uses mechanical grab to harness wire for connection. Its design does not use soldering. Thus its loop resistance is slightly higher naturally. You may use Relative feature to offset it. --- End quote --- But relative offset button doesn't helps. because probe resistance is randomly floating when you use it. If you set zero on DMM, it will show some offset when you move probes, because their resistance is changed. When it was new, the floating resistance was not a huge, it has floating from about 0.08 to 0.16 Ω and you can close eyes on that. I thought that this is related with temperature dependency. But after 1-2 years it drops to 0.2-0.4 Ω and this is not acceptable. :horse: I tested my DMM with Chinese silicone wires 1 meter each with banana plugs to make sure that this issue is related to the probes and not to DMM. I bought these wires on aliexpress for 8 USD for 5 pieces and they show 0.01-0.02 Ω despite the fact that I bought them about 1 year ago. And there is no floating resistance with Chinese wires, like it happens with Brymen probes. So I don't recommend these probes, they are not reliable, they have floating resistance issue just out of the box. And this floating resistance will be much worse after 1-2 years, because something is oxidized inside. I'm not sure if this is common issue for Brymen probes or I got just a defective probes, but as Brymen said - they don't use soldering, so at a glance it looks like the reason why they are oxidized. They are gold plated and it really helps to get contact without pressure on probes, but their internal resistance which is floating when you use probes just make them useless for resistance measurements. You will need to use another probes or wires when you needs to measure low resistnace. Regarding to the Brymen BM867S, that's my model and this is really good DMM. I can recommend it. But note that there is needs to buy a replacement probes, because branded one which comes with Brymen DMM has a bad quality. The main difference between BM867 and BM869 is that BM869 has better precision for RMS voltage measurement and works up to 100 kHz. Also BM869 has temperature probes and a little better precision for voltage measurement. Nothig else. |
| nez:
--- Quote from: radiolistener on May 03, 2021, 07:55:19 pm ---... My Brymen probes has 0.08-0.16 Ω when I bought it with my BM867S and now, after 2-3 years of rare usage at home conditions it has floating 0.2-0.4 Ω. I tried to clean its banana plugs with rubber and ethanol, but it doesn't help. The only way to restore 0.08 Ω is to move and pull the wire near banana plugs, at some position it returns to 0.08 Ω, but if I leave it for some time, it returns back to floating state with 0.2-0.4 Ω. It looks that there is a bad contact between wire and banana plug inside plastic. --- End quote --- Yeah I have the exact same problem, and it's annoying. I likewise can mess around with the wires next to the connectors to get them back to 0.08 ohms, but the hidden contacts' resistances drift back up after a while. I'm probably going to order some leads from Probe Master since I've seen a variety of people recommending them. [Edit] The small downside is I lose the form factor of the leads that fit into the holders on the DMM rubber case.. Aside from the Brymen test leads, I do love the DMM itself (BM869s). |
| radiolistener:
--- Quote from: nez on May 03, 2021, 10:06:52 pm ---I'm probably going to order some leads from Probe Master since I've seen a variety of people recommending them. --- End quote --- I also read good feedback about Probe Master golden plated leads. Does somebody have it? What about their resistance? |
| Fungus:
--- Quote from: radiolistener on May 03, 2021, 07:55:19 pm ---They are gold plated and it really helps to get contact without pressure on probes, but their internal resistance which is floating when you use probes just make them useless for resistance measurements. You will need to use another probes or wires when you needs to measure low resistnace. --- End quote --- FWIW I just checked mine and it said 0.06 Ohms. I've never noticed a problem but I hardly ever measure very low resistances so that's not surprising. If I did then I'd either look into other leads or techniques. I'd probably want something much sharper/needle-like anyway (eg. those $3 cheapies). |
| rsjsouza:
@nubinstanley, as others have confirmed, your choice for the BM867S is good and its other limitations w.r.t. to your original BM869S choice are the temperature and the lower bandwidth (20kHz instead of 100kHz for the 869). Unless you are working with audio and is interested in measuring the upper echelons of the frequency band, it should be alright. Regarding probes, many threads in this forum praise Probe Master for its quality and features - even Dave made a video about it a long time ago. Just one aspect if you care for aesthetics: check the thread below for information about the banana jacks that may not be fully inserted depending on the model purchased. https://www.eevblog.com/forum/testgear/probe-master-test-leads/ Good luck in your purchase! |
| Navigation |
| Message Index |
| Next page |
| Previous page |