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Unformatted text preview: that the direction of the current is opposite to what you thought it was. 3 Using the multimeter as a voltmeter when the ammeter function is selected
must be avoided. The internal fuse will blow if such an ammeter is hooked across a
potential diﬀerence of more than a few volts. This includes power supplies.
A resistance measurement uses electrical power provided by the meter itself. Do not
attempt to measure the resistance of a component when it is still connected to a circuit. To do
so would either give a meaningless result, or worse, damage the meter. You must disconnect
an individual component from the circuit before measuring its resistance otherwise you will
measure the equivalent resistance of the whole circuit. Uncertainties in Multimeter Readings
The accuracy of the meter is often printed on the bottom side of the meter in the form
±([%of reading] + [number of least signiﬁcant digits]).
For example, if the accuracy for resistance is given as ±(0.2%+2), then a reading of 0.673 k...
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This note was uploaded on 02/13/2014 for the course PHYS 2055 taught by Professor Drayethiraj during the Winter '14 term at Memorial University.
- Winter '14