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Low ohms measurements 200 1984

uid 27's pic
posted by  Art Benstein on  Thu Dec 5 11:13 CST 2002
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last visit: Fri Oct 17 20:10 CST 2014
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Yes. yes. yes. Dar should not throw away the AMM based on this measurement.

I have a beef with Bentley (and I think originally the Volvo tech publisher) here anyway. It looks to me like the writer was looking for an easy way to discriminate between good and bad AMMs with an ohmmeter. It tells you to measure the resistance of the idle mixture pot (0-1000 ohms) which is practically never at fault. But that "hot wire" measurement isn't even reading the hot wire - it is the resistance of a film resistor in the air path used to balance the bridge -- another part that never goes bad. So, unfortunately it leads us to believe you'll have a good AMM if these two readings are OK, something you might rely on in the junkyard, but the precious platinum wire could be totally gone and these readings would be in or near "spec". All the -002 AMMs I've had the pleasure of examining have a problem with the operational amplifier chip and its laser-trimmed bias adjustment, not detectable by making these ohmmeter measurements. And given the range of measuring instruments we could use, from my Benton Harbor relics to the best from Fluke and Keithley, how could they spec such a close tolerance?

--
Art Benstein near Baltimore






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