Products > Test Equipment
Multiple questions about Brymen multimeters (BM857s, BM859s, BM789)
elemieu:
Dear community,
let me get straight to the point...
I am deciding on buying either BM857s, BM859s, or BM789.
I don't care for measuring temperature. A factor which brought me to these meters is the fast continuity buzzer response. This alongside a meter's life expectancy is the most important criterion. I tend to trust more mature products when it comes to electronics, which is why I am inclined to buy the BM857s the most.
I mostly dabble in digital electronics, but occasionally probe about connections with mains voltage on them.
1. What is the functional difference between 850 and 850s series? Words like *s*uperb and *s*wift keep popping up throughout the latter's brochure. But that in itself does not imply that much...
2. What makes BM859s $50 more expensive than BM857s? I've only been able to spot slight differences in accuracy, the ability of the newer model to measure temperature, as well as operate reliably at a wider bandwidth. But, to me, that in itself doesn't seem to justify the price tag. Is there something I'm missing?
3. How does the BM789 compare to the former two in terms of its potential propensity to die after very little use?
I do apologise if some of these questions have already been discussed in other topics; I must have missed them.
The more verbose your answers are, the better. Thank you.
mwb1100:
--- Quote from: elemieu on July 01, 2023, 09:58:41 pm ---1. What is the functional difference between 850 and 850s series? Words like *s*uperb and *s*wift keep popping up throughout the latter's brochure. But that in itself does not imply that much...
--- End quote ---
Don't know if this applies to the 850 series, but the one difference I was able to find between the BM257 and BM257s was that the current measurement range went from 8A to 10A.
joeqsmith:
--- Quote from: mwb1100 on July 02, 2023, 12:22:41 am ---
--- Quote from: elemieu on July 01, 2023, 09:58:41 pm ---1. What is the functional difference between 850 and 850s series? Words like *s*uperb and *s*wift keep popping up throughout the latter's brochure. But that in itself does not imply that much...
--- End quote ---
Don't know if this applies to the 850 series, but the one difference I was able to find between the BM257 and BM257s was that the current measurement range went from 8A to 10A.
--- End quote ---
When I had asked Brymen about the BM869 vs BM869s, they had re-certified for CATIV 1000V. At a minimum, the HRC fuse would have changed.
sonpul:
--- Quote from: elemieu on July 01, 2023, 09:58:41 pm ---3. How does the BM789 compare to the former two in terms of its potential propensity to die after very little use?
--- End quote ---
I have 2xBM789 in operation every day and there are no failures, they work stably. I'm sure BM857s, BM859s, like any other complex technical device, also has a very low failure rate.
AutoHold Real-Read™, BeepLit™ Continuity, BeepLit™ Diode Alert, long display backlight, stable and long life on 3xAA Eneloop batteries. This is not on
BM857, BM859.
J-R:
My understanding is that Brymen doesn't sell both "s" and non-"s" versions of a specific model number, such as BM869s. They made various improvements at some point, so added the "s" model and stopped selling the previous model without the "s". Otherwise you would not be able to tell them apart.
You do have it right with the differences between the BM857s and BM859s. As with many products, the pricing structure can be a complex decision on the manufacturer's side, such as component cost or buyer psychology. Sometimes when a product lineup is first launched, the cost difference was significant, but over time that changes. In the case of the BM867s and BM869s, it's been reported that the performance disparity was not at the point Brymen was claiming, which could be a simple result of it being cheaper to buy one part for both models rather than have to deal with two. This is why for some products you can hack them to the higher model with just software changes.
However, I still suspect Brymen holds the BM8x9s models to a higher standard, so they might be at least binning the better components. And even in this case it's not 100% a done deal. Say you have to make 500 of the lower model and 100 of the higher, but you bin the components and find that you have 300 for lower and 300 for higher. Well, the higher-end components could end up in the lower-end model. Or maybe you change suppliers and only get higher spec parts.
This is all speculation on my side, though.
I don't think you can go wrong with any of the models you mentioned, assuming the one you choose has the feature set you are looking for.
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