Products > Test Equipment
Blew Up My First Oscilloscope!!!
tooki:
What amazes me is that Kemet is still manufacturing those awful things. (Kemet bought up Evox-Rifa years ago.)
For example, here’s the datasheet for the exact series shown in the preview of Dave’s video above: http://www.kemet.com/Lists/ProductCatalog/Attachments/322/KEM_F3011_PME271M_X2_275.pdf
Like... ugh.
David Hess:
--- Quote from: Keicar on February 27, 2019, 07:23:20 am ---Schaffner line filter perhaps?
--- End quote ---
Or the paper-film RIFA X and Y capacitors.
tooki:
--- Quote from: David Hess on February 28, 2019, 04:57:21 am ---
--- Quote from: Keicar on February 27, 2019, 07:23:20 am ---Schaffner line filter perhaps?
--- End quote ---
Or the paper-film RIFA X and Y capacitors.
--- End quote ---
You’re about a day late. ;) It was already confirmed to be those, hence the ensuing discussion of them.
james_s:
--- Quote from: tooki on February 28, 2019, 04:47:02 am ---What amazes me is that Kemet is still manufacturing those awful things. (Kemet bought up Evox-Rifa years ago.)
For example, here’s the datasheet for the exact series shown in the preview of Dave’s video above: http://www.kemet.com/Lists/ProductCatalog/Attachments/322/KEM_F3011_PME271M_X2_275.pdf
Like... ugh.
--- End quote ---
Perhaps they have been improved?
Also it's worth noting that the ones that are failing now are mostly more than 20 years old, while not ideal I have a hard time being upset over 20+ year old components failing. I had one burn up in the power supply of an Apple IIe years ago, it made a bunch of stinky smoke but it didn't really cause any collateral damage.
Zenith:
Here are two Rifa 2200pF Y class capacitors which are probably over 20 years old, but are unused and have been kept in reasonable conditions. Both are cracked in the same place. The crack underlines the Rifa logo and goes up just short of the corners and there's a similar crack on the back. It looks to be an age related thing.
There are loads of X and Y rated capacitors of the same age which don't have this class fault.
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