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

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Capacitance Traceability Chart

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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

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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

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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

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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

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Measurement Circuit Mode

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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 +

=

Measurement Circuit Mode

Capacitance Measurement Large value

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RsMore significant

RpLess significant

Large CLow Z

Small value

RPMore significant

RSLess significant

Small CHigh Z

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Measurement Circuit Mode

Inductance Measurement Large value

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RsMore significant

RpLess significant

Large LHigh Z

Small value

RPMore significant

RSLess significant

Small LLow Z

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Measurement Circuit Mode

Cs Ls

Low impedance

Large C, Small L

Cp Lp

High impedance

Small C, Large L

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Terminal configuration

Two terminal Three terminal Four terminal Four terminal pair

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Two-terminal measurement technique

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Typical impedance measurement range

Advantage :Simplest method Disadvantage :Contains many sources of error

Three-terminal measurement technique

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Typical impedance measurement range

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

Four-terminal measurement technique

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Typical impedance measurement range

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

Four-terminal pair measurement technique

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Typical impedance measurement range

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

Terminal configuration

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2-terminal3-terminal (binding post)

2-terminal

Type : GR 1409

Type : GR 1482

Terminal configuration

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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

Measurement error and compensation

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OPEN Compensation

42090A Open Termination(4-Terminal Pair)

Measurement error and compensation

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SHORT compensation Residual impedance (Z)

SHORT Compensation

42091A Short Termination(4-Terminal Pair)

Measurement error and compensation

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StraymeasureDUT CCC =

cablemeasureDUT LLL =

Analysis of specification (PM6304/C)

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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)

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

Thanks

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Traceability chart

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Reference

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Example of measurement accuracy

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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