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Greenlee DM-820 DMM (rebranded Brymen) teardown

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Trader:
WOW, another fix (I won't modify first post).

After reading:  https://www.eevblog.com/forum/beginners/looking-for-help-selecting-a-budget-multi-meter-im-quite-overwhelmed/msg2411139/#msg2411139

Seems that THIS "Greenlee DM-820" is the BM815s, not the BM857s.

http://www.brymen.com/PD02BM810s_815s.html

It's crazy, but seems that Greenlee released some DMMs with the same model name "DM-820".


--- Quote from: Trader on February 05, 2023, 05:33:12 am ---
--- Quote from: Mephitus on July 17, 2015, 06:53:15 pm ---I recently made an eBay score of this Greenlee DM-820 for $31USD :-DMM. Which from my research is just a rebranded Brymen BM859.

--- End quote ---

I know this is an old thread but seems the Greenlee DM-820 is like the Brymen BM857, not BM859.

Some differences:

- the AC Bandwidth that's 20kHz on Greenlee DM-820 and Brymen BM857, but 100kHz on Greenlee DM-860 / Brymen BM859 / Amprobe AM-160-A / Extech MM570A.

- 1 temperature measure, not 2 temp measures like in the BM859

- a little less accuracy in almost all scales

- I'm not sure if has AC+DC measurements.

https://www.welectron.com/mediafiles/datasheets/brymen/Brymen_BM850s_Datasheet.pdf

Another curiosity, Greenlee released a new model also called "DM-820", but it's a 10,000 counts meter.

Greenlee DM-820 is still an excellent DMM ($31 is a giveaway), I'm just clarifying the comparison.

And just to add another comparison, seems the BM859 is a little more precise them the BM869 in DC voltages:

- between 5V and 50V (0.02%+2d vs 0.03% + 2d)
- above 500V (0.05%+2d vs 0.15% + 2d)
* Input Impedance: 10M, 30pF nominal (80pF nominal for 500mV range) vs 60pF.

--- End quote ---

J-R:
DM-820 vs DM-820A...

From what I'm seeing:

Greenlee DM-820 is the original Brymen BM815, without the "s", so no BeepJack feature.

Greenlee DM-820A is the BM827s but adds a backlight.  I don't see a Brymen that matches this exactly, maybe a custom tweak per Greenlee's request?

Neutrion:
Is that a Hycon IC made in Japan? Or they used something different?

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