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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
30 July 2013
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
30 July 2013
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
Electrical Club 630 July 2013
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
Electrical Club 830 July 2013
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
Electrical Club 9
RsMore significant
RpLess significant
Large CLow Z
Small value
RPMore significant
RSLess significant
Small CHigh Z
30 July 2013
Measurement Circuit Mode
Inductance Measurement Large value
Electrical Club 10
RsMore significant
RpLess significant
Large LHigh Z
Small value
RPMore significant
RSLess significant
Small LLow Z
30 July 2013
Measurement Circuit Mode
Cs Ls
Low impedance
Large C, Small L
Cp Lp
High impedance
Small C, Large L
30 July 2013Electrical Club 11
Terminal configuration
Two terminal Three terminal Four terminal Four terminal pair
30 July 2013Electrical Club 12
Two-terminal measurement technique
30 July 2013Electrical Club 13
Typical impedance measurement range
Advantage :Simplest method Disadvantage :Contains many sources of error
Three-terminal measurement technique
30 July 2013Electrical Club 14
Typical impedance measurement range
Advantage :Reduce stray capacitanceDisadvantage :RL , LL and Rc still remain
Four-terminal measurement technique
30 July 2013Electrical Club 15
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
30 July 2013Electrical Club 16
Typical impedance measurement range
Advantage :RL , LL and Rc are eliminatedImprove the impedance measurement range to 1 mMagnetic couplings M are eliminated
Terminal configuration
30 July 2013Electrical Club 17
2-terminal3-terminal (binding post)
2-terminal
Type : GR 1409
Type : GR 1482
Terminal configuration
30 July 2013Electrical Club 18
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
30 July 2013Electrical Club 20OPEN compensation Stray admittance (Y)
OPEN Compensation
42090A Open Termination(4-Terminal Pair)
Measurement error and compensation
30 July 2013Electrical Club 21
SHORT compensation Residual impedance (Z)
SHORT Compensation
42091A Short Termination(4-Terminal Pair)
Measurement error and compensation
30 July 2013Electrical Club 22
StraymeasureDUT CCC =
cablemeasureDUT LLL =
Analysis of specification (PM6304/C)
30 July 2013Electrical Club 23
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)
30 July 2013Electrical Club 24
100 mH @ 300 Hz (Accuracy PM6304)o Low Level = 0.5 %o Normal Level = 0.1 %o High Level = 0.1 %
Thanks
30 July 2013Electrical Club 25
Traceability chart
Electrical Club 2630 July 2013
Reference
30 July 2013Electrical Club 27
Example of measurement accuracy
30 July 2013Electrical Club 28
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