On Tue, 17 Nov 2009 20:30:42 +0000, Ian Jackson
wrote:
In message , John Fields
writes
On Tue, 17 Nov 2009 19:15:38 +0000, Ian Jackson
wrote:
In message , John Fields
writes
[ A UUEncoded file (5 microamp d'Arsonval.jpg) was included here. ]
Is that really a 5 microamp meter, or actually just a meter with a 5
microamp FSD scale?
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It's real. :-)
JF
[ A UUEncoded file (meter box.jpg) was included here. ]
Go on! I'll bet it's not!
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Don't bet too much.
The resistor on the right is a 1 megohm 1% RN55, the Fluke's on the
200ľA FS range and I've even given you a peek at the back of the meter
so you can see nothing sneaky's going on there.
Well, almost... The lighting isn't all that great.
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I thought that the best you got was something
like 50uA. If it really IS 5uA, take care not to drop it.
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Or even handle it roughly without a short across the terminals
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I've got one or two meters which 'lie' the other way. They are
reasonably sensitive but are intended to be used with a shunt, and are
scaled for an FSD higher than their basic sensitivity.
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Entirely practical.
JF