Re: Fixing old Fluke DMM, why the carbon resistor?

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Got it, thanks Dave.

Re: Fixing old Fluke DMM, why the carbon resistor?


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**  Nonsense.

 "cer"   indicates a  " cermet"  aka  " metal glaze " resistor.


Got it, thanks Dave.


**  But where ??


......   Phil



Re: Fixing old Fluke DMM, why the carbon resistor?
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Not at all. Could well be ceramic composition, like this one for
example:
http://www.ohmite.com/catalog/pdf/ox_oy_series.pdf
Designed for high energy surges and the like.

The actual part number is in the BOM if Geoff is interested to know
what the exact one is.

Dave.

Re: Fixing old Fluke DMM, why the carbon resistor?
On Mon, 8 Sep 2008 22:01:50 -0700 (PDT), "David L. Jones"

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R2 has a part number of RG1/2-105M-5%. and is described as ...

 Res, Cer, 1M, 1W, 5%

FWIW, the following datasheet is for RG series "PRECISION NON MILITARY
METAL GLAZE™ RESISTORS":
http://www.irctt.com/pdf_files/RG.pdf

The RG 1/2 types are rated at 1W, 5%, ±200 ppm/°C.

The construction is described as "Metal Glaze thick film element fired
at 1000°C to solid ceramic core".

The Fluke manual lists the following resistors from the same
manufacturer:

 R1  Res, MF, 1K, fusible, 5%,  p/n FA8466
 R20 Res, WW, fusible, .36, 2W  p/n SPF3605

FWIW, IRC also have FA8025 series (FA8225, FA8325, FA8425), 2%, metal
film, flameproof resistors on a ceramic rod:
http://www.irctt.com/pdf_files/FA8025.pdf

... and SP20F series 1W, fusible, wirewound resistors:
http://www.irctt.com/pdf_files/SP20.pdf

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

Re: Fixing old Fluke DMM, why the carbon resistor?

"Franc Zabkar"
 "David L. Jones"
"Phil Allison"
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**  QED.

 Good research   -   Franc  !





....    Phil





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