LCR meter

Abstract

A LCR meter (Inductance (L), Capacitance (C), and Resistance (R)) is a piece of electronic test equipment used to measure, among other things, the impedance (inductance, capacitance, resistance) of a component. Currently some models of LRC meters are there. They are very costly but have good precision. But the controversy between the precision and the cost will be the most important consideration if we take it as an instrument. Because this is obvious that if we need a good precision we need more and more complex circuits and also we need more research component to get that much precision. So cost of the instrument will be high according to that precision. But other way we do not more accurate values all the time. If we take an ordinary electronic workshop/lab which is centered at a university or college there are so many practical need much more accurate measurements. So, the major percentage of practical need the matter, which the students should ensure that the vale printed in the label is correct or not before they deploy the component in circuit. Our motivation is to develop a circuit which low cost as well as acceptable precision. So, we think it will be good product for the normal laboratory measurements in a low cost. Every electronic or electrical laboratory should have meter like this to ensure the component values. In the normal LRC meters, usually the device under test (DUT) is subjected to an AC voltage source, then the voltage over, and the current through the DUT are measured. The measured impedance consists of real and complex components. The phase angle (Φ) also is an important parameter, digital instruments are gaining popularity over their analog counterparts due to their high accuracy, high input impedance, small in size and weight, along with this type provide other facilities like auto zeroing, auto ranging as well as auto power off and power down mode in large digital instruments Accurately our end product has the facility to measure the inductance, capacitance and resistance with auto ranging. It takes the normal AC power supply and display the measurements in a LCD display with units.