how to make precise capacitance and inductance measurements using an lcr...
TRANSCRIPT
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HOW TO MAKE PRECISE
CAPACITANCE AND INDUCTANCE
MEASUREMENTS USING AN LCR
METER
Name: M Khoza
Date: 13 October 2015
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Table of Contents
Overview
Comparison Reported Results
Definition of an LCR Meter
LCR Meter Calibration
LCR Meter Circuit Modes
Equipment Setup and Connections
Source of Errors & Preventative Action
Aspects of Consideration
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Overview
Accredited laboratories participated in the 2011 inductance and 2013 capacitance interlaboratory comparisons.
LCR meter used as a measuring and transfer standard.
Laboratories imported traceability from the pilot laboratory,NMISA.
The normalised error (En) values of the reported results were calculated as a measure of the proficiency. Values greater than plus or minus one required investigation.
The outcome of investigation noted the incorrect use of the LCR meter.
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Comparison Reported Results
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Definition of an LCR Meter
LCR meter is an electronic piece of equipment that measures the inductance, capacitance and resistance of a passive component.
The current through and voltage across the component, and phase difference between the voltage and current measured.
Capacitance, inductance and resistance of the component calculated using measured quantities
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LCR Meter Calibration
Two types of LCR meter calibrations: open/short and traceable calibrations
Open/short calibration Compensates the residual capacitance, inductance and impedance of the test fixture and cables.
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LCR Meter Calibration cont:
Traceable calibration Performed to check the accuracy of the instrument against calibrated reference standards. Link the measurements performed by LCR to SI units
Standard capacitors (3T) Standard capacitors (4T) Standard inductors
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LCR Meter Circuit Modes
Two types of circuit modes: Parallel and Series Parallel mode is the default for capacitance and resistance
measurements When the reactance is large, the series resistance is
negligible and then the parallel model is used Series mode is the default for inductance measurements When the reactance is small, the parallel resistance is
negligible and then the series model is used
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LCR Meter Circuit Mode cont:
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Equipment Set up and connections
Types of connections: 2-terminal, 3-terminal and 4-terminal 2-terminal 3-terminal 4-terminal
Errors: Guad terminal Effectively removes lead inductance, elimanates the lead inducatnce resistance and lead inductance and resistance, and stray capacitance and resistance, stray capacitance NB: less accurate stray capacitance NB: precise and accurate NB: accurate
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Equipment Set up and connections cont:
2 Terminal
4 Terminal
3 Terminal
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Equipment Set up and connections cont:
2 Terminal: capacitance
3 Terminal: capacitance
4 Terminal: capacitance
2 Terminal: inductance
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Source of Errors & Preventative Action
Two different reported results, which is correct? Source of errors Preventative action
signal
signal
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Aspects of consideration
Open/short calibration Traceable calibration Test voltage, current and frequency Proper connections Accuracy specifications
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Thank you