On 04/01/2013 08:43, harry wrote:

Of course current flows in the voltmeter, how else could it work?
The better the quality of the instrument, the lower current it needs
for full scale deflection, hence the less effect it has on the circuit
measured.




Even a 4 quid multimeter will have an input impedance in the mega Ohm
range. The inaccuracies due the the meter impedance and measurement
leads is vanishingly small and completely swamped by the specified
accuracy of the shunt resistor and voltmeter.

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