Extech MM570A new backlight - Page 1
Forum section: electronics / testgear

author: wguibas
author_rank: Unknown
timestamp: September 09, 2015, 04:45:47 pm
content: Just got a new MM570A, looks like they improved the backlight, but it still only stays on for 15 seconds.

author: nanofrog
author_rank: Super Contributor
timestamp: September 09, 2015, 05:29:39 pm
content: FWIW, Brymen is the ODM, and they improved the backlight a while back.Yours is a relabeledBrymen BM859a(.pdf datasheet; photos still show the older backlight, which isn't as nice). It's a very nice meter IME (I've the BM857a).

author: mos6502
author_rank: Frequent Contributor
timestamp: September 09, 2015, 05:40:29 pm
content: Quote from: nanofrog on September 09, 2015, 05:29:39 pmIs the BM859 still being manufactured? I though it was replaced by the BM869? They have essentially the same specs and are basically the same price, too.

author: Lightages
author_rank: Unknown
timestamp: September 09, 2015, 05:54:29 pm
content: The BM857S and BM859S are in production. The BM867S and BM869S were not meant as a replacements.

author: ElectronicsNewbie
author_rank: Contributor
timestamp: September 09, 2015, 05:55:06 pm
content: You can get brand new BM857S and BM869S.

author: nanofrog
author_rank: Super Contributor
timestamp: September 09, 2015, 06:04:32 pm
content: Quote from: mos6502 on September 09, 2015, 05:40:29 pmYes, the BM85x series is still being manufactured along side the BM86x series (latest models have an S at the end).BM869 adds a dual display to the mix (and a newer enclosure).BTW, if you go toBrymen's main page, and scroll down, there's anSenior Products (Obsoleted! No longer available!)section for EOL'ed meters.

author: mos6502
author_rank: Frequent Contributor
timestamp: September 09, 2015, 06:06:53 pm
content: Interesting. I forgot, the BM869 has a dual display. And it's also a newer generation. The 869 is 199€, vs. 183€ for the 859, so really no reason to get the 859, right?Is there a way to disable the backlight timer on the 869?

author: nanofrog
author_rank: Super Contributor
timestamp: September 09, 2015, 07:41:51 pm
content: Quote from: mos6502 on September 09, 2015, 06:06:53 pmFor such a small price difference, I'd go for the BM869 (dual displays may not be necessary, but they sure are nice).As per changing/disabling the backlight timer, it doesn't appear you can change it on any of their meters (~30 seconds is it, based on every manual I have). That said, it's adequate most of the time (and not the end-of-the-world when it isn't).FWIW, theGreenlee DM-860Ais the same meter, so you can download the manual if you want to take a closer look at how it operates before buying (click theDocumentstab for the manual link).

author: mos6502
author_rank: Frequent Contributor
timestamp: September 09, 2015, 08:59:06 pm
content: Quote from: nanofrog on September 09, 2015, 07:41:51 pmThanks, I went through the manual. There's no way to change the backlight timer. See, that's what really grinds my gears.You can turn off the auto power off function by pressing select when turning the meter on. Why doesn't that also disable the backlight timer? Maybe, if I don't want the meter to turn off, I also want the backlight to stay on? It's little things like that that are really annoying when the designers get them wrong.

author: Lightages
author_rank: Unknown
timestamp: September 09, 2015, 09:45:38 pm
content: Yes, if there is one thing I hate with most multimeter designs, is a fixed back light timer. Brymens have the option to disable timeout for the meter, and to disable the beep, but the back light is as it is. More manufacturers need to provide a way to disable timeouts on the back light too.The BM857S is a good buy but it is does not have temperature. If you need temperature and higher accuracy, than the BM869S is the better buy than the BM859S IMHO.