Author Topic: Advantest R6551 DMM  (Read 1939 times)

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Offline radhaz

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Advantest R6551 DMM
« on: March 27, 2015, 03:57:08 am »
Hi guys.
I have an Advantest R6551 DMM bought off of Ebay. It mostly works OK, but the AC functions are pretty much dead (ACI, ACV). Using my DMMCheck I get no response on ACV or ACI), DC stuff and ohms are good.
There is not a service manual to be found anywhere. Any ideas about where to begin looking? This DMM is from around the late 1980s early 1990s.

Offline rastro

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Re: Advantest R6551 DMM
« Reply #1 on: March 27, 2015, 09:09:25 pm »
Advantest doesn't seem to have much information available on most of their test gear.

FWIW some principals of operation are in the back of the user manual.,%20R6551EMC%20%20Operation.pdf

Since it's all A/C functionality not working you may want to look for a relay that routes the input's for the A/C path from the banana jacks.  Perhaps DC is the default path?

It might be worthwhile to post a few pictures of the insides. 
« Last Edit: March 27, 2015, 09:37:54 pm by rastro »

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