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Author Topic: Radio Shack 22-168A multimeter tear down  (Read 7053 times)

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Offline RotarenegTopic starter

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Radio Shack 22-168A multimeter tear down
« on: April 29, 2013, 03:54:49 pm »
After seeing Dave tear down various multimeters I got curious as to what the guts of my old Radio Shack 22-168A meter (which is a rebadged Metex M-3650D) looks like. Please excuse the glass fuse, it did originally come with a ceramic one, but at some point I blew both it and the spare and replaced it with a glass fuse with the same rating without knowing any better.

To view full size, click on the images to go the the Flickr page and then right click on the photo and choose original.





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« Last Edit: April 30, 2013, 08:00:35 pm by Rotareneg »
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Offline david77

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Re: Radio Shack 22-168A multimeter tear down
« Reply #1 on: April 29, 2013, 05:29:32 pm »
Nice meter. I've got the Metex 3630 which has served me well for the last 13 years. I think Metex meters were quite good for the money but have nearly vanished completely in the last few years.
They used to be big with the large electronics chains like RadioShack or Conrad here in Germany. Conrad has switched to rebaged Uni-T's and other Chinese cheapies.
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Offline Hydrawerk

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Re: Radio Shack 22-168A multimeter tear down
« Reply #2 on: April 29, 2013, 05:54:58 pm »
What's the purpose of the PTC1 thermistor? Well, I don't like that the white 20A fuse is hidden under the PCB. On the other hand, the PCB is not mounted to the case with screws as on my Unitrend UT70A, so it is still rather OK. Their website still exists, but it looks like frozen in time or what. http://www.metex.co.kr/
According to the manual the M-3650D seems to be designed in year 1993. Somebody gave me this old machine, too. The capacitor meter is broken, but otherwise the instrument is OK.
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Offline free_electron

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Re: Radio Shack 22-168A multimeter tear down
« Reply #3 on: April 29, 2013, 07:56:20 pm »
what a funny design.  they use a 7106 , which has its own display driver , tie it into a logic array and then extract bargraph and other stuff from it ...

(the max130 is a pin compatible witht he 7106)
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Any comments, or points of view expressed, are my own and not endorsed , induced or compensated by my employer(s).
 

Offline Hydrawerk

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Re: Radio Shack 22-168A multimeter tear down
« Reply #4 on: April 14, 2016, 11:00:18 pm »
Photos are unavailable.  :(
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Offline Vgkid

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Re: Radio Shack 22-168A multimeter tear down
« Reply #5 on: April 15, 2016, 07:31:08 am »
Quote from: Hydrawerk on April 14, 2016, 11:00:18 pm
Photos are unavailable.  :(
well it was uploaded 5 years ago, and op was on here 1 year ago.
So  :-BROKE
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