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LCR Meter Calibration

LCR Meter Calibration (Web Thumbnail)

1.What is LCR Meter ?

LCR Meter is a specialized device for testing the inductance (L), capacitance (C) and resistance (R) of electronic components. This equipment is applied at laboratories, factories, warranty offices to research, develop, testand repair electronic components. The LCR Meter series possesses the ability to measure a variety of parameters: the inductor quality coefficient (Q) and the coefficient (D) is similar to Q but for resistance. With the improvement in technology, LCR Meter is integrated with other measuring devices such as oscilloscopes, pulse generators, … Provides many parameters for users to accurately assess the device status. The testing efficiency, maintenance and repair work will achieve higher efficiency.

LCR Meter

2. Scope of procedure

Unit Under Test Characteristics Performance Range Performance method
LCR Meter

Handhelds LCR Meter

Up to 100 MΩ

Up to 100 μF

Up to 10 H

(20 Hz ~ 1 MHz)

Comparison to by LCR Standard

3. Standard and supporting device

✔ Digital Multimeter

✔ LCR Calibrator

✔ Standard Inductor

✔ Standard Capacitor

✔ Decade Resistor

✔ Connecting Leads/Wires

✔ LCR meter test leads / 4 BNC Connector

4. Environment conditions 

Temperature: (18 ÷ 28)°C

Relative Humidity: (40 ÷ 60)%RH

5. Preparation 

– Technician must be familiar with calibration techniques and the operator manual of the UUT being calibrated.
– Ensure UUT Fulse are of the proper value, if applicable , before beginning calibration.
– Connect UUT and test equipment to appropriate power source. Set all STANDBY / POWER ON and allow warm-up as required by the manufacturer.
– Ensure line regulation on these power supplies, vary the input voltage to the UUT by ±10%.
– Short UUT test leads together to zero. The UUT must indicate 10 counters or less.

6. Perform 

6.1 Frequency Accuracy Test

– Connect UUT as show as above.
– Calibration points will be perform at 100 Hz, 120 Hz, 1kHz, 10kHz, 100kHz with 1V. Other test point follow customer’s requirements.
– Set Digital Multimeter function switch to measure frequency.
– Adjust UUT Frequency for the desired output value.
– Record the Digital Multimeter indicator.
– Repeat at least 5 times
– Repeat for remain test points.
– Disconnect test leads.

6.2 Level Accuracy Test

– Connect UUT as figure 1.
– Calibration points will be perform follow table below.
– Set Digital Multimeter function switch to measure VAC, VDC.
– Record the Digital Multimeter indicator.
– Repeat at least 5 times.
– Repeat for remain test points.
– Disconnect test leads.
Frequency UUT Setting
1kHz 1 Vrms
2 Vrms
3 Vrms
4 Vrms
5 Vrms
DC 0.5 V
1 V
1.5 V
2 V
3 V

 6.3 Capacitance Calibration

– Connect UUT.
– Set UUT function measure Capacitance.
– Set UUT with signal level: 1Vrms , Trigger : Int, Speed : slow , Cable Length 1m.

– Set UUT range dependent on the appropriate capacitors in table below. Other test point follow customer’s requirements.
Frequency Capacitor Value
20 Hz ~ 1 MHz 10 pF
100 pF
1 nF
10 nF
100 nF
1 μF
10 μF
100 μF
– Record the UUT value.
– Repeat at least 5 times.
– Repeat the above steps with other frequency points.
– Disconnect the capacitor from UUT test leads.

6.4 Resistance Calibration

– Connect UUT as show Fig.2 for 4 BNC connector.
– Connect UUT as show Fig.3 for LCR meter test leads.
– Set UUT function measure Resistance.
– Set UUT with signal level: 1Vrms , Trigger : Int, Speed : slow .
– Set UUT range dependent on the appropriate resistance in table below. Other test point follow customer’srequirements.

Frequency Resistor Value
20 Hz ~ 1 MHz 0.1 mΩ
1 mΩ
10 mΩ
100 mΩ
1 Ω
10 Ω
100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
100 MΩ
– Record the UUT value.
– Repeat at least 5 times.
– Repeat the above steps with other frequency points.
– Disconnect the resistance from UUT test leads.

6.5 Inductance Calibration

– Connect UUT as show Fig.2 for 4 BNC connector.
– Connect UUT as show Fig.4 for LCR meter test leads.
– Set UUT function measure Inductance.
– Set UUT with signal level: 1Vrms , Trigger : Int, Speed : slow .
– Set UUT range dependent on the appropriate inductor in table below. Other test point follow customer’s requirements.

Frequency Inductor Value
20 Hz ~ 1 MHz 10 μH
100 μH
1 mH
10 mH
100 mH
1 H
10 H

– Record the UUT value.
– Repeat at least 5 times.
– Repeat the above steps with other frequency points.
– Disconnect the inductancefrom UUT test leads.
Calibration now completed, turn off, disconnect and secure all equipment.

*Note : Other function of equipment reference to the manufacturer’s instructions or customer’s requirement.

7. Tolerance

– Customer required tolerances are to be used for all calibrations unless otherwise noted.
– If the customer does not supply instrument tolerances then manufacturing specifications or other approved sources are to be used as the default tolerance.
– If not, non-judgement results will be applied

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