Electronics > Beginners
Capacitors in a Fluke multimeter
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windsmurf:
I've been looking at the back of a Fluke 26-3 meter, and see these fairly large capacitors (7.3mm length on the bigger ones).
I have a couple of noob questions regarding them.
What is the manufacturer/brand of these caps?
What is the red stuff underneath these caps?
Is the notation used to signify their values a standard? E.g. I can't decipher voltage or tolerance... does it not exist on these?
Cnoob:
The red stuff is some form of glue, used to keep components in place for wave soldering.
As for the capacitors I found they they are Tantalum capacitors. [url][https://www.alibaba.com/showroom/tant-cap-100uf.html/url]
Markings are I think are 47uF 10V working and 15uf 10V working as for manufacture no idea.
other one is 4.7uf 20V working
tooki:
They're Vishay polymer tantalum caps. The "K5" and "K7" markings are date codes meaning May 1998 and July 1998, respectively. The 2 in a circle means Vishay. Then the value is microfarads and volts, so 4.7-20, 47-10, and 15-10 mean 4.7uF 20V, 47uF 10V, and 15uF 10V, respectively. They do not have any tolerance, temperature, or model markings.
https://www.vishay.com/capacitors/tantalum/tantalum-polymer/
http://www.vishay.com/docs/40110/faq.pdf
The red stuff is, exactly as Cnoob said, glue to secure the components for wave soldering.
windsmurf:
Thanks Cnoob, and tooki for the complete explanation! ^-^
retiredcaps:
Fluke 77 III service manual has the values and schematics.
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