[volt-nuts] Fluke 720a self calibration repair
csteinmetz at yandex.com
Fri Sep 25 20:27:41 EDT 2015
>>I had to look it up. The company was Arrow (800 833 3557). The pots
>>were manufactured by Bournes with a manufacturer part number of
>>300SP-1-502. Unit cost $7.73 in 2011. I bought 26 so my cost was
>>about $200. I wanted a "Manufactured in America" part but can't
>>remember if that was too pricey or not.
>They are now $92.55 from Arrow now and Farnell want over $200 each
>if you buy 25 or more!!!! There don't seem to be any obvious cheap
>alternatives for 10 turn 20ppm/C 5W pots.
The original pots were Bunker Ramo-Eltra (later, Bunker
Ramo-Amphenol) P/N 3800P-502. These were 20-turn, 5k, 10%, 1W, +/-50
ppm/C wirewound parts in the 34b rectangular package. The Bourns
3005P-1-502 matches these specifications (I suspect "300SP" in
Charles's message was a typo). I do not know if the pin layout is
the same as the 3800P-502. Verical has the lowest price on the
3005P-1-502 that I could find in a quick search, $7.68 each. Others
charge from $9 to $14.
Tony -- what part number were you quoting specs and prices for? I
found nothing searching for "300SP-1-502."
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