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Microcontroller based LCR meter
Published in Elsevier
1996
Volume: 20
   
Issue: 5
Pages: 297 - 301
Abstract
A microcontroller based scheme for LCR measurement is described. The unknown element (an inductor or a capacitor or a resistor) is measured employing a non conventional ac bridge. The element to be measured forms one arm (side) of the bridge and the second (series) arm is made up of a simple resistor. A Multiplier type Digital to Analog Converter (MDAC), controlled by a microcontroller, serves as the other two arms, The microcontroller, after obtaining quadrature condition between the bridge output and one of the designated bridge voltages, acquires the current through and voltage across the series connected resistor. With these values and the value of digital input to the MDAC, the parameters of L or C or R values are evaluated by the microcontroller and displayed in appropriate display fields. The scheme was implemented using an Intel 8751 microcontroller. An overall accuracy of the order of ±1.0% was achieved for the prototype with a 12-bit MDAC having an accuracy of ±0.2%.
About the journal
JournalData powered by TypesetMicroprocessors and Microsystems
PublisherData powered by TypesetElsevier
ISSN01419331
Open AccessNo
Concepts (8)
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    Analog to digital conversion
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    Capacitance measurement
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    Electric resistance measurement
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    Inductance measurement
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    Microcomputers
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    INTEL 8751 MICROCONTROLLER
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    MULTIPLE TYPE DIGITAL TO ANALOG CONVERTER (MDAC)
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    ELECTRIC MEASURING BRIDGES