Author Topic: Capacitors in a Fluke multimeter  (Read 1067 times)

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Offline windsmurfTopic starter

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Capacitors in a Fluke multimeter
« on: April 07, 2019, 10:55:11 am »
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?

 

 

Offline Cnoob

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Re: Capacitors in a Fluke multimeter
« Reply #1 on: April 07, 2019, 11:30:33 am »
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
« Last Edit: April 07, 2019, 11:43:14 am by Cnoob »
 

Offline tooki

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Re: Capacitors in a Fluke multimeter
« Reply #2 on: April 07, 2019, 11:43:59 am »
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.
 

Offline windsmurfTopic starter

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Re: Capacitors in a Fluke multimeter
« Reply #3 on: April 07, 2019, 07:13:32 pm »
Thanks Cnoob, and tooki for the complete explanation!  ^-^
 
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Offline retiredcaps

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Re: Capacitors in a Fluke multimeter
« Reply #4 on: April 08, 2019, 04:08:31 am »
Fluke 77 III service manual has the values and schematics.
 
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