OEM for this ATEX modified DMM ?

[shakalnokturn]

I have this oldish DMM that was modified for use in explosive atmospheres by a small French company  called "A puissance 3".

The DMM itself is obviously not their design, I'd be curious to know who actually made it.

[coromonadalix]

Could be Metrix  now  Chauvin Arnoux

Or Metex 


BTW

The company still exist, why not sending them an Email  ??

IT could be their design  while using known DMM ic ??

[shakalnokturn]

Nothing about this thing smells Metrix, I've been in enough Metrix and Chauvin-Arnoux T.E. to say this isn't.
It has more of a Taiwanese feel... I'd thought of Metex but don't see any similar models.

I can't find any information on the ASIC.

[coromonadalix]

found your  puppy

Soar 3255
Hewlett Packard E2378A

http://www.auldies.euweb.cz/indev_VA_dig.html#SOAR
https://www.radiomuseum.org/r/hewlett_pa_digital_multimeter_e2378a.html


http://nice.kaze.com/av/e2378a_man.pdf

http://mrmodemhead.com/blog/yokogawa-7534-03-multimeter/

[bdunham7]

It's actually a Yokogawa 7534-03 which was rebranded as the HP and probably others.

The ASIC is an OKI MSM6306. 

[coromonadalix]

beat me to it  loll

https://www.eevblog.com/forum/testgear/teardown-of-a-rebadged-yokogawa-()-multimeter/

[shakalnokturn]

That's the one! Thanks.

Why would the manufacturer be Yokogawa more than Soar?

Looking around at external photos and scarce internal photos of other models both Yokogawa and Soar, I'd say it looks more Soar than anything else.

[bdunham7]

Why would the manufacturer be Yokogawa more than Soar?

That question might be complicated and obscure history lesson.  They're both Japanese companies, Soar no longer makes multimeters AFAIK and Yokogawa still does.  What their relationship was at that time, IDK.