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FORMAL LABORATORY REPORT A COMPARISON OF VOLTMETERS Department of Electronic Engineering Course: EE3152 Name: Date: Abstract The aim of the experiment was to study the loading effect of two types of voltmeter, one analogue and one digital, and to determine their suitability for circuit measurements. The results indicated that the impedance of one type of meter was dependent on the range selected, and was much less (at low voltage ranges) than the impedance of the other type of meter which remained fixed. It was concluded that one of the meters was far superior in respect of circuit loading due to its fixed high impedance. Introduction Connecting an ideal voltmeter to a circuit would not load or disturb the currents in the circuit as the voltmeter would have an infinite impedance. When a practical voltmeter is connected, the circuit is loaded by the impedance of the voltmeter causing a disturbance. The loading effect of an analogue and digital meter will be examined by connecting them to a voltage source with a very high impedance. Current drawn from the source as a result of circuit loading will cause a detectable volt drop across the internal impedance of the source. As the voltage and impedance of the source are known, the current drawn from the source and hence the impedance of the voltmeter will be easily be determined by Ohms law.
Approximate Word count = 837
Approximate Pages = 3.3
(250 words per page double spaced)
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