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meter sensitivity versus internal resistance
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February 14th 04, 09:47 PM
Uwe Langmesser
Posts: n/a
You are right Tom.
But my question was that when the sensitivity, for example 1 kohms/volt, is
known, can one then also know, without further measurement, the internal
resistance.
And from what I gather the answer to that question is NO.
thank you all
Uwe
in article
, Tom Bruhns at
wrote on 2/13/04 1:26 PM:
Think "Ohm's Law." The meter movement responds to a current. To read
voltage, you put a resistor in series with the meter movement so that
V(full scale) = R(total)*I(meter, full scale). R(total) is the sum of
the meter's internal resistance and the external series resistor. So
a 1mA meter movement always gives 1kohms/volt, and a 20uA meter
movement gives 50kohms/volt.
Cheers,
Tom
Uwe Langmesser wrote in message
...
Is there a simple relationship between a meters internal resistance and its
sensitivity (ohms per volt).
Maybe this is trivial but I don't see it.
Uwe
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