Resistance measurement using Whitson's unbalanced measuring bridge
DOI:
https://doi.org/10.31548/energiya2(72).2024.162Abstract
The Wheatstone measuring bridge is one of the types of measuring bridge circuits and is used to measure resistance. The bridge was invented by Samuel Christie who created it in 1833 and was later improved by Charles Whitson in 1843.
The purpose of the study is to check how the change in the supply voltage of the Whitson measuring bridge in the balanced state affects the value of the measured resistance, and to derive and verify the formula for calculating the resistance in the unbalanced bridge mode.
To carry out research in a balanced mode, it is necessary to create a circuit of a Whitson bridge with a power source in the simulator of electronic circuits. When changing the supply voltage, check whether the readings of the voltmeter will change. To simplify the bridge balancing procedure, measurements are carried out in unbalanced mode. To do this, it is necessary to derive the formula for calculating the unknown resistance and check the calculated values with the resistance values obtained during modeling in the electronic simulator.
The obtained results in the unbalanced mode will allow you to determine how the change in the voltage of the power source affects the value of the measured resistance. The calculation of the unknown resistance in the unbalanced mode will reduce the time for the measurement and will enable the use of microcontroller circuits to process the measurement result. A formula was derived by which the value of the resistance measured in the unbalanced mode can be calculated, and the obtained result was verified in the Falstad circuit simulator.
The proposed method of resistance measurement using the Whitson bridge in unbalanced mode will increase the speed of measurement of unknown resistance and will enable the use of microcontroller processing of the measurement result.
Key words: Whitson measuring bridge, resistance, measurement, voltage source, resistor, Ohm's law
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