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