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[defaced thread] Affordable DMM Checkers: AC Reference...

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Majorassburn:
Will Start New Thread Later Without "tggzzz" Bullshit & Interference!

tggzzz:

--- Quote from: Majorassburn on April 22, 2024, 10:56:19 pm ---I design 'em and build 'em and they REALLY work!  :-DMM
eBay Links:
https://www.ebay.com/itm/285825801852
https://www.ebay.com/itm/285823822244
https://www.ebay.com/itm/285807578003
https://www.ebay.com/itm/285823885283
Thanx for looking!  :)

--- End quote ---

Description states
"LT1236-10 Ultra-Low-Drift 5ppm 10V Reference."
"Final Trim to 10.0000 VDC @ 78F, 50% Humidity"
"NEW, Hand-Crafted in USA to Work PERFECTLY, No Returns."

That's 5ppm per what? Day, month, year, degree C, degree F, supply voltage, RH, shock (since the ICs are socketed)?

Picture below states "Designed to affordably verify the function of Digital Multimeters".
Does that mean it is suitable to verify the function of my Agilent 34410A, Keithley 2015 THD, Solartron 7081?

coromonadalix:
I would say not ...  while i salute the projects,  they can not compare to well designed lm399  and ltz1000  ones or the AD xxx series too

to check 6.5 digits meters you need more ...

Resistors references   are weak ... say ordinary

tggzzz:

--- Quote from: coromonadalix on April 23, 2024, 10:07:19 am ---I would say not ...  while i salute the projects,  they can not compare to well designed lm399  and ltz1000  ones or the AD xxx series too

to check 6.5 digits meters you need more ...

Resistors references   are weak ... say ordinary

--- End quote ---

"You might think that. I couldn't possibly comment" :)
https://villains.fandom.com/wiki/Francis_Urquhart

Kosmic:

--- Quote from: Majorassburn on April 22, 2024, 10:56:19 pm ---I design 'em and build 'em and they REALLY work!  :-DMM
eBay Links:
https://www.ebay.com/itm/285825801852
https://www.ebay.com/itm/285823822244
https://www.ebay.com/itm/285807578003
https://www.ebay.com/itm/285823885283
Thanx for looking!  :)

--- End quote ---

Also, about those "0.05% Precision Resistors" do you know the temperature coefficient ? They look like your generic metal film and could be around 200-100 ppm/C. So even, if they were selected, change in ambient temperature could easily move them outside the 0.05% you are mentioning. I don't think calling them "Precision Resistor" is really accurate.

I don't want to be overly negative but all that look a lot like a modern snake oil salesman. Of course your clients are not going to complain, they are not equipped to validate your claims. I'm not even sure you are.

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