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LCR METER
Kongunadu College of Engineering and Technology
Contents:
Introduction
LCR meter basics
Bridge Method
LCR Bridge Measurement Guidelines
References
Introduction
 LCR meters or LCR bridges are items of test equipment or test
instrumentation used to measure the inductance, capacitance,
and resistance of components.
 LCR meters tend to be specialist items of test equipment, often
used for inspection to ensure that the components arriving are
correct. They can also be used in a development laboratory
where it is necessary to test and measure the true performance
of particular components.
 The LCR meter or LCR bridge takes its name from the fact that
the inductance, capacitance and resistance are denoted by the
letters L, C, and R respectively. Some versions of the LCR
meter use a bridge circuit format as the basis of its circuit
giving the name that is often used.
Kongunadu College of Engineering and Technology
Cont…
 A variety of meters are available. Simpler versions of LCR
meters provide indications of the impedance only converting
the values to inductance or capacitance.
 More sophisticated designs of LCR bridge are able to measure
the true inductance or capacitance, and also the equivalent
series resistance and tanδ of capacitors and the Q factor of
inductive components. This makes them valuable for assessing
the overall performance or quality of the component.
Kongunadu College of Engineering and Technology
LCR meter basics
Two main circuit techniques are used to form the basis of an LCR
meter.
 Bridge method
 Current-voltage measurement
Kongunadu College of Engineering and Technology
Bridge method
Kongunadu College of Engineering and Technology
Current-voltage measurement:
Kongunadu College of Engineering and Technology
Cont…
Kongunadu College of Engineering and Technology
LCR bridge measurement
guidelines
Kongunadu College of Engineering and Technology
 Effect of lead length: At frequencies above 1 MHz or so the
lead length can start to have an effect. As a rough guide a good
estimate for lead inductance is around 10 nH per cm of lead.
For the best measurements kep the leads as short as possible.
 Measure at operational frequency: When making
measurements using an LCR meter it helps to use a test
frequency as close to the actual operational frequency as
possible. This means that the effects of any stray effects or
changes due to frequency are minimised - for example inductor
cores may have different properties at different frequencies.
This can make a noticeable difference in some instances.
Cont…
Kongunadu College of Engineering and Technology
 Adjust test amplitude: In the same way that it is good practice
to measure at a frequency that is as close to the operational
frequency as possible, the same is true for the test amplitude.
This is because component values may vary with the signal
applied. This is particularly true for inductors that use cores
such as ferrite that may introduce losses. These may be
amplitude dependent.
 Discharge capacitors before measurement: Some capacitors
may carry a residual charge under some circumstances. It is
best to discharge them before any measurements. As charge on
some capacitors can linger for some time, it is always best to
discharge them before any tests.
Kongunadu College of Engineering and Technology
Reference:
 https://www.electronics-notes.com/articles/test-
methods/lcr-meter-bridge/primer-basics.php
 https://ieeexplore.ieee.org/document/1604290
 https://ieeexplore.ieee.org/document/7529776
 https://ieeexplore.ieee.org/document/8282577
 https://www.youtube.com/watch?v=3wwd9Ducixc

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LCR Meter Guide

  • 1. LCR METER Kongunadu College of Engineering and Technology Contents: Introduction LCR meter basics Bridge Method LCR Bridge Measurement Guidelines References
  • 2. Introduction  LCR meters or LCR bridges are items of test equipment or test instrumentation used to measure the inductance, capacitance, and resistance of components.  LCR meters tend to be specialist items of test equipment, often used for inspection to ensure that the components arriving are correct. They can also be used in a development laboratory where it is necessary to test and measure the true performance of particular components.  The LCR meter or LCR bridge takes its name from the fact that the inductance, capacitance and resistance are denoted by the letters L, C, and R respectively. Some versions of the LCR meter use a bridge circuit format as the basis of its circuit giving the name that is often used. Kongunadu College of Engineering and Technology
  • 3. Cont…  A variety of meters are available. Simpler versions of LCR meters provide indications of the impedance only converting the values to inductance or capacitance.  More sophisticated designs of LCR bridge are able to measure the true inductance or capacitance, and also the equivalent series resistance and tanδ of capacitors and the Q factor of inductive components. This makes them valuable for assessing the overall performance or quality of the component. Kongunadu College of Engineering and Technology
  • 4. LCR meter basics Two main circuit techniques are used to form the basis of an LCR meter.  Bridge method  Current-voltage measurement Kongunadu College of Engineering and Technology
  • 5. Bridge method Kongunadu College of Engineering and Technology
  • 6. Current-voltage measurement: Kongunadu College of Engineering and Technology
  • 7. Cont… Kongunadu College of Engineering and Technology
  • 8. LCR bridge measurement guidelines Kongunadu College of Engineering and Technology  Effect of lead length: At frequencies above 1 MHz or so the lead length can start to have an effect. As a rough guide a good estimate for lead inductance is around 10 nH per cm of lead. For the best measurements kep the leads as short as possible.  Measure at operational frequency: When making measurements using an LCR meter it helps to use a test frequency as close to the actual operational frequency as possible. This means that the effects of any stray effects or changes due to frequency are minimised - for example inductor cores may have different properties at different frequencies. This can make a noticeable difference in some instances.
  • 9. Cont… Kongunadu College of Engineering and Technology  Adjust test amplitude: In the same way that it is good practice to measure at a frequency that is as close to the operational frequency as possible, the same is true for the test amplitude. This is because component values may vary with the signal applied. This is particularly true for inductors that use cores such as ferrite that may introduce losses. These may be amplitude dependent.  Discharge capacitors before measurement: Some capacitors may carry a residual charge under some circumstances. It is best to discharge them before any measurements. As charge on some capacitors can linger for some time, it is always best to discharge them before any tests.
  • 10. Kongunadu College of Engineering and Technology Reference:  https://www.electronics-notes.com/articles/test- methods/lcr-meter-bridge/primer-basics.php  https://ieeexplore.ieee.org/document/1604290  https://ieeexplore.ieee.org/document/7529776  https://ieeexplore.ieee.org/document/8282577  https://www.youtube.com/watch?v=3wwd9Ducixc