On Thu, 19 Nov 2009 13:02:30 -0600, John Fields
wrote:

On Thu, 19 Nov 2009 18:53:02 +0100, "Arie de Muynck"
wrote:

John Fields ...
Ian Jackson ...
Is that really a 5 microamp meter, or actually just a meter with a 5
microamp FSD scale?
It's real. :-)

And a real beauty it is.

What is the internal resistance,

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Can't find the spec but, measured here, about 6000 ohms.
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AKA how much uWatt does it need?

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Since P = I²R = 5e-6A * 6e3R = 3e-2W = 30mW for full-scale deflection.
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And how does that compare against 'normal' instruments?

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Dunno, but check out the Simpson, Tripplett, etc. websites to find out.
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That is pretty typical of the sensitive movements that i have been
close enough to touch. A hand full or so, not all that many. Then
again, they never were all that common.

I noticed that e.g. the same type of relay always need the same coil power
regardless the voltage.

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OK...

JF