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Author Topic: Gossen Metrawatt Metrahit 15S DMM tear down  (Read 6543 times)

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Offline Kiriakos GR

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Gossen Metrawatt Metrahit 15S DMM tear down
« on: October 22, 2014, 07:35:18 PM »
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  :)
 
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Offline giavra

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Re: Gossen Metrawatt Metrahit 15S DMM tear down
« Reply #1 on: October 22, 2014, 08:23:00 PM »
Marvellous post very useful  ;) 

Offline giorgos

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Re: Gossen Metrawatt Metrahit 15S DMM tear down
« Reply #2 on: October 23, 2014, 07:11:39 PM »
This meter had to be repair? or you just opened it ?
Any impressions from this, did you make measurements?

Offline Kiriakos GR

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Re: Gossen Metrawatt Metrahit 15S DMM tear down
« Reply #3 on: October 23, 2014, 07:30:43 PM »
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.   
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Offline Kiriakos GR

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Re: Gossen Metrawatt Metrahit 15S DMM tear down
« Reply #4 on: October 23, 2014, 08:45:36 PM »
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)  :)
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Offline Kiriakos GR

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Re: Gossen Metrawatt Metrahit 15S DMM tear down
« Reply #5 on: October 23, 2014, 08:53:57 PM »
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.
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