lcr meter and its application 30july13

LCR Meter and its applicationsDr.-Ing. Monthol Homklintian

130 July 2013

Outlines

NIMTs Traceability chart Impedance measurement instrument Measurement circuit mode Terminal configuration Measurement error and compensation Analysis of specification

Electrical Club 230 July 2013

Capacitance Traceability Chart

Electrical Club 3

Set of fused silica capacitance standard

uncertainty 10-8

Capacitance bridgeuncertainty 10-6

NIMT ReferenceStandard (National Standard)

1st-levelWorkingStandard

2nd-level Working Standard

General Measuring Equipment

Capacitance standarduncertainty 10-5

LCR Meteruncertainty 10-4

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Inductance Traceability Chart

Electrical Club 4

WorkingStandard

General Measuring Equipment

NIMT ReferenceStandard(National Standard)

Set of Inductance standard

100 H to 10 Huncertainty 10-6

Set of Inductance standard

100 H to 10 Huncertainty 10-5

LCR Meteruncertainty 10-4

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CMC

30 July 2013Electrical Club 5

Capacitance Range Uncertainty (k=2)1 pF, 10 pF, 100 pF 1000 Hz and 1592 Hz 0.8010-6

1000 pF 1000 Hz and 1592 Hz 3.510-6

Inductance Range Uncertainty (k=2)100 H, 1 mH, 10 mH, 100 mH, 1 H, 10 H 1000 Hz 0.1610

-3

Impedance measurement instrument

Measurement method Applicable frequency rangeBridge method DC to 300 MHzResonant method 10 kHz to 70 MHzI-V method 10 kHz to 100 MHzNetwork analysis method 300 kHz and aboveAuto-balancing bridge method 20 Hz to 110 MHz


Principle of auto-balancing bridge method

Advantage-Wide frequency coverage from LF to HF-High accuracy over a wide impedance measurement range-Grounded device measurement

Disadvantage-Higher frequency ranges not available

Applicable frequency range 20 Hz to 110 MHz

7Electrical Club 30 July 2013

Measurement Circuit Mode


Circuit Mode

Measurement function

Definition of D, Q and G

Cp Cp-DCp-QCp-GCp-RP

CS CS-DCS-QCS-RS

Lp Lp-DLp-QLp-GLp-RP

LS LS-DLS-QLS-RS

QRfCD

PP

12

1==

PRG 1=

QRfCD SS

12 ==

DfLRQ

P

P 12

==

PRG 1=

DRfLQS

S 12 == )1(

12D

LL PS +=

)1(1

2DCC SP +

=


Capacitance Measurement Large value

Electrical Club 9

RsMore significant

RpLess significant

Large CLow Z

Small value

RPMore significant

RSLess significant

Small CHigh Z

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Inductance Measurement Large value

Electrical Club 10

RsMore significant

RpLess significant

Large LHigh Z

Small value

RPMore significant

RSLess significant

Small LLow Z

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Cs Ls

Low impedance

Large C, Small L

Cp Lp

High impedance

Small C, Large L


Terminal configuration

Two terminal Three terminal Four terminal Four terminal pair


Two-terminal measurement technique


Typical impedance measurement range

Advantage :Simplest method Disadvantage :Contains many sources of error

Three-terminal measurement technique



Advantage :Reduce stray capacitanceDisadvantage :RL , LL and Rc still remain

Four-terminal measurement technique



Advantage :RL , LL and Rc are eliminatedDisadvantage :Stray capacitance C0 still remain Magnetic coupling M induces error voltages

Four-terminal pair measurement technique



Advantage :RL , LL and Rc are eliminatedImprove the impedance measurement range to 1 mMagnetic couplings M are eliminated



2-terminal3-terminal (binding post)

2-terminal

Type : GR 1409

Type : GR 1482



3-terminal (coaxial)

4-terminal pair4-terminal

Type : IET 1404

Type : QuadTech 1417 Type : HP 16380

Measurement error and compensation

30 July 2013Electrical Club 19Basic accuracy ! : not included Cable / Test Fixture

Instrument inaccuracies (including test signal level inaccuracy, and impedance measurement inaccuracy)

Residuals in the test fixtures and cables Noise


30 July 2013Electrical Club 20OPEN compensation Stray admittance (Y)

OPEN Compensation

42090A Open Termination(4-Terminal Pair)



SHORT compensation Residual impedance (Z)

SHORT Compensation

42091A Short Termination(4-Terminal Pair)



StraymeasureDUT CCC =

cablemeasureDUT LLL =

Analysis of specification (PM6304/C)


10 nF @ 1 kHz (Accuracy PM6304C)o Low Level = 0.5 %o Normal Level = 0.05 %o High Level = 0.1 %

Analysis of specification (PM6304/C)


100 mH @ 300 Hz (Accuracy PM6304)o Low Level = 0.5 %o Normal Level = 0.1 %o High Level = 0.1 %

Thanks


Traceability chart


Reference


Example of measurement accuracy


OutlinesCapacitance Traceability ChartInductance Traceability ChartCMCImpedance measurement instrumentPrinciple of auto-balancing bridge methodMeasurement Circuit ModeMeasurement Circuit Mode Measurement Circuit Mode Measurement Circuit Mode Terminal configurationTwo-terminal measurement techniqueThree-terminal measurement techniqueFour-terminal measurement technique Four-terminal pair measurement technique Terminal configurationTerminal configurationMeasurement error and compensation Measurement error and compensation Measurement error and compensation Measurement error and compensation Analysis of specification (PM6304/C) Analysis of specification (PM6304/C) Slide Number 25Traceability chartReference Example of measurement accuracy

lcr meter and its application 30july13

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