EEVblog #613 - Prema 6047 Multimeter Teardown

Teardown Tuesday.
What's inside a 1980's vintage 8.5 digit multimeter, the 6047 from Prema. Or did Dave diddle himself?
EEVblog Main Web Site:
EEVblog Amazon Store:
Donations:
Projects:
Electronics Info Wiki:

[mikeselectricstuff]

I'd guess that "1041" serial no is actually 41 for something this obscure. Quite common to pad out small serial numbers.

[electronicsNmore]

Great video. Yes the diode, and resistors that appear to be repaired from the top side of the board are not to perfection, but I have serious doubts that those repairs would ever pose a problem. I have seen a lot worse that lasted many years.

[Pillowcase]

what a gorgeous piece of vintage equipment... i love the digits integrated into the key panel

[robertw]

The only down side to a super high resolution meter is the $2, 500.00 they charge to calibrate one, having that done twice a year adds up fast... it looks to me like that thing was built on a bench one by one and tweaked a lot, probably took days to make one, almost like each one was a prototype and the parts were played with empirically to get it just right...

[xDevscom_EE]

And sorry to correct you, but it's 7.5 DMM. Only 6048 is 8.5.
So keep working to get a proper volt-nut gear. :)
And I keep mine EDC 24/7 live.

[hannonm]

Love how all the IC's are in sockets. easy to replace

[aserta]

I buy quite a few things on Ebay. But one thing i do is i always communicate with the seller to ensure good packaging. Never got anything damaged. 

In parting : Nobody wants a negative and if you don't ensure they do it right they won't.

[kleinerbub]

PREMA operates from the city where I live, never heard of them before! Crazy!

[ratdude]

I hate how ebay reviews ask for shipping charge accuracy but there's nothing on packaging quality. I have a buddy who was screwed over on an LCD that way... some hilljack packed it in pop can boxes for padding... Some pack it well, some are hopeless!

[Archer]

Isabellenhütte is a company founded in 1482 in Dillenburg, Germany. They are specialized in precision and high-load resistors. And they co-developed Manganin, an alloy for high-precision resistors.

[VolksTrieb]

Isabellenhütte is like 10 miles from here ^^ They do low coefficient wireresistors :)

[compactc]

I prefer either a about 5+ inches of bubble wrap or lots of foam peanuts. Lots of people hate the peanuts but I love them, they are great packaging!

[redtails]

2:50 hope the postal service didn't ruin it..

though for this reason (and for chance of the thing getting lost), it's a small effort to send stuff insured.. Where I live, I send anything over 100€ of value ensured because otherwise it's just too risky of getting lost or damaged. Of course with gear like this, you're only going to get back your eBay bidding or costs, and not the full value of the machine

[jusb]

considering you bought it from the UK and he only charged 19, 99 delivery, it arrived in one piece! well done  the post office

[ovalwingnut]

Really intriguing. And yes, I was surprised to see such a "casual layout" considering its pedigree. I like it no matter. But then again I like weird chit. Thanks so much Ausi Man ❤

[mausball]

Looking at the construction, I'm guessing it's serial 41, not 1041. No one has ever padded low serial numbers before, have they? ;-)

[compactc]

I tend not to even try to hide my horror when something happens like the employee tossing the meter down on the counter. I'd have probably involuntarily gasped and had a look of horror on my face.

[SantaClaw]

I see the board in the middle was marked as 6048 - I - 5
 and the left from the front is also marked as 6048 - M - 2
And the right one, the one under the shield marked as 6048 - V - 5
I wonder what makes it a 6047... I guess they just used the same boards, just different components ?

[winstonsmith]

After seeing the caps across the resistors on the board under the shield, perhaps what look like repairs elsewhere were actually due to a manufacturer field mod?

[hinz]

Did cost 613 USD on ebay.uk, if that's the one (the dirt on the display and below the power button is the same, as is the black stuff under the mADC button). Quite cheap compared to the HP3458A, but the 3456A is a magnitute cheaper and with 2ppm still more thanb enough for me