Soar 4020 Teardown from mid 80's

[Hagis2k]

Well i have this old multimeter and been using this for like 20 years, been pretty ok over the years i decided it was time for a regular service/cleaning
of this 28 year old multimeter as i do believe they came out on the market 1985-86 or so.






Well when you look into this old device it is not the most protected on the (V) terminal Z1 must be a zener diode as it is between (V) and (Common) then later up after the red cable there is a small PTC got no CAT markings i assume that was not even "invented" back then but just look at the fuses rated at 250V and the multimeter should be able to handle 750V/AC 1000V/DC
haha long before HRC fuses.

But for being a 28 year old multimeter it works flawlessly

What did really happen to SOAR did they just vanish?

[Zbig]

[..]
What did really happen to SOAR did they just vanish?

Well, they definitely didn't SOAR, that's for sure Sorry. It actually looks quite nice and modern for the times to my eyes. I'm also quite surprised they were already doing autoranging (or at least "soft-ranging") back then - I somehow got the idea of it being a relatively new feature. Maybe that's because no such things were available these sides back then. Well, not much else was for that matter but that's a whole different story.

[retiredcaps]

What did really happen to SOAR did they just vanish?

I'm fairly certain Yokogawa made the multimeter for SOAR (and HP at the time). The similiarities can be seen here.

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

PS. Thanks for the teardown photos.  I always enjoy seeing the internals especially on meters that are not easy to get here in Canada/North America.

[Hydrawerk]

Oh, this is a very decent multimeter even today. Well, compare this SOAR to that Digimer 10... https://www.eevblog.com/forum/blog/eevblog-482-retro-iskra-multimeter-teardown/msg351343/#msg351343