Products > Test Equipment
UNI-T UT61E Multimeter teardown photos.
hgg:
Layout design is key of course but from what manufacturer were the 07D751K MOVs?
There are many Chinese replicas around with the same part numbers. Maybe they
were not so fast as their datasheet claims. After the protection modification, you should
have used the same MOVs to see if it survive. (If they were not damaged of course).
Did you use the same MOVs?
joeqsmith:
Comparing the UT61E's shown and the one 5ky had sent, they are a lot different. Note the place for 4 MOVs. I guess even within one revision of the meter you can't be sure what you are getting. Roll the dice..
hgg:
--- Quote ---I guess even within one revision of the meter you can't be sure what you are getting. Roll the dice..
--- End quote ---
True...
My UT61E has a different layout.
The isolation PCB gaps between the PTCs are also missing...
Same MOVs and survived after the mod. Clearly poor design.
Both the 181A and the UT61E do not have proper HV isolation slots.
Maybe that's why they fail.
joeqsmith:
Yours looks like the others I have seen posted. :-// Even if I wanted to do an A/B compare, getting meters that are the same appears to be a problem.
At the start of that video, I had shown what the ESD transient looked like after a few people had asked. It's pretty fast. Funny that the UT10A with it's one PTC survived so well compared with so many of their much more costly meters. Again, roll the dice..
hgg:
--- Quote ---Funny that the UT10A with it's one PTC survived so well compared with so many of their much more costly meters
--- End quote ---
Indeed.
There must be an explanation though.
How did it survive with just the PTC which is just for over current protection? :o
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