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DMMCheck Plus Multimeter Reference(and other References) - Experiences..

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Fungus:

--- Quote from: Shonky on July 10, 2023, 12:47:55 am ---Mine came with a "cal" sheet as shown.

--- End quote ---

I've seen that cal sheet before...  :)

https://www.eevblog.com/forum/metrology/are-cheap-ad584-units-worth-it/msg920924/#msg920924

rsjsouza:
My unit came with a hand written sticker and it has been quite stable over the years. I can't complain for throwaway money. The AD586 device on it is clearly re-used from somewhere else but, as Fungus mentioned, it gives more confidence the initial drift has been surpassed and the unit is much more stable.

all_repair:

--- Quote from: Fungus on July 09, 2023, 06:57:49 am ---
--- Quote from: Shonky on July 09, 2023, 04:53:50 am ---AD584LH on the linked one is likely fake on these as they haven't been made in quite a while - 10 years or more. The picture does show a 1223 date code, but well... you know...

--- End quote ---

I think they're likely to be second hand chips pulled out of old devices.

(i.e. well burned-in  :) )


--- Quote from: Shonky on July 09, 2023, 04:53:50 am ---Some of the pictures show terrible quality and indicate they don't include any "cal data"

--- End quote ---

If they send garbage you can just open a claim and get your money back. It's easy. :-//

(I have no idea where people see "risk" on Aliexpress. Returns and refunds are just as easy as Amazon - you don't like something? Just get your RMA barcode and drop it off at the kiosk on the corner, no questions asked...)

--- End quote ---

Old volt-nut chips are much sought after item in the Chinese volt-nut community.  It is a desirable feature as that means it is a much stable chip that shall have lesser drift later.

Checkup the price and availabilty of the new chip and you shall see the makers are doing a great service.  And the literature are in Chinese show that these goods are meant for, and by, the local volt-nut community

Veteran68:

--- Quote from: Fungus on July 10, 2023, 02:10:44 am ---I've seen that cal sheet before...  :)

https://www.eevblog.com/forum/metrology/are-cheap-ad584-units-worth-it/msg920924/#msg920924



--- End quote ---

I'm shocked, SHOCKED!, I tell you!  :D

I knew when I got it that there was no way they were typing up, printing, and cutting out each of these for each unit. The handwritten ones are much more believable.

Fungus:

--- Quote from: Veteran68 on July 10, 2023, 02:45:00 am ---The handwritten ones are much more believable.

--- End quote ---

Yep.

Mine actually seems to have a transcription error.

Attentive readers might have noticed I didn't post the 7.5V reading in the previous post:


Everything I've ever measured it with has shown around 7.506V so I think whoever wrote the number on the sticker inserted an extra zero by mistake (there's usually two zeros after a '5', right?)

To me it makes it even more authentic.  :)

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