Gossen Metrawatt Metrahit 15S DMM tear down

[Kiriakos GR]

This meter arrived to me for an inspection from another friend from Greece.
Even as out of warranty, Gossen was kind to offer to me technical documentation and few suggestions. 
I like to thanks Mr. Hans Decker  GMC-I Service GmbH

In public view the inner parts of Metrahit 15S 
 

[giavra]

Marvellous post very useful   

[giorgos]

This meter had to be repair? or you just opened it ?
Any impressions from this, did you make measurements?

[Kiriakos GR]

This meter came in due a complain for unstable operation at mA range.
To disassemble and assembly back the range switch is a pain in the ass.
Now I am at the last stage to solder back the banana inputs, and the next step is long running tests.
At that point I am just 100% sure that range switch and PCB contamination is out of the game.   

[Kiriakos GR]

My quick tests shown that this meter other than stable operation is close enough to be described as spot on.
Tomorrow I will do an 100mA long running test as soon I discover how to disable the auto-power off timer.

(yes I have screen protectors in all my meters, do not do a beauty contest) 

[Kiriakos GR]

Any impressions from this, did you make measurements?

It is a 3000 counts with a sweet looking display.
It seems to have 4-5 measurements per second display update rate at DC, but at ACV is slow as 2-3 times max.