Reducing Uncertainty in EMC Measurements
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- Quentin Underwood
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1 Reducing Uncertainty in EMC Measurements
2 Uncertainty In general, a standardized EMC test must be developed such that reproducible results are obtained if different parties perform the same test with the same EUT. However, various uncertainty sources and influence quantities cause the reproducibility of a standardized EMC test to be limited. (From CISPR introduction)
3 Status of Cispr First published in 2002 a Cispr Then split up in Cispr :2003 (same as Cispr 16-4). Applied by product standards: Cispr 11 (Amd 2: and Cispr 22:2005 (5th ed.). Only a statement of ULab in the report needed. New proposal to check if ULab exceeds UCispr. Publication is due in 2010
4 CISPR16 Uncertainty CISPR recommendations and technical reports CISPR Uncertainty in standardized EMC Tests CISPR Statistical consideration in the determination of EMC compliance of mass Product CISPR Statistics of complaints and model for the calculation of limits CISPR Uncertainties, statistics and limits modelling Conditions for use of the alternative test methods CISPR Editions on uncertainties in EMC measurements CISPR Measurement instrumentation uncertainty
5 Focusing on Emission Testing Measurement Instrumentation Uncertainty MUST be taken into account when determining compliance or non-compliance with a disturbance limit. The Measurement Instrumentation Uncertainty for a Test Laboratory (U lab ) MUST be evaluated for the measurements addressed in CISPR clauses, taking into account every single quantity listed there.
6 Focusing on Emission Testing CISPR Standard clearly defines Uncertainty topics for Emission Tests, whose most relevant contributions come from: - EMI/EMC Receivers - Test Set-Up (layout, cables, adapters, site attenuation, ) - LISNs and AMNs in general (ISNs, CDNs, Voltage Probes, ) - Absorbing Clamps - Antennas - Coupling between above components
7 Uncertainty Evaluation Formula Combined Standard Uncertainty where xi = estimate of input quantity Xi u(xi) = standard uncertainty of xi ci = sensitivity coefficient y = result of a measurement (the estimate of the measurand), corrected for all recognized significant systematic effects (i.e. estimate value of xi)
8 CISPR example
9 U CISPR Reference Table
10 Compliance Assessment by CISPR The Expanded Measurement Instrumentation Uncertainty U lab for a test laboratory shall be calculated using:
11 A graphical example
12 Receiver Uncertainty Contribution In Radiated & Conducted Emission measurements the receiver is the most complex equipment due to: Sophisticated measuring functions Large number of active & passive components Effect of aging on calibration Effect of environmental factors on calibration
13 Analog to Digital Receivers Uncertainty Budget Comparison PMM Hz - 30 MHz Item (Receiver Specification) CISPR Specified Uncertainty (db) Digital Receiver Uncertainty (db) Receiver Reading ± 0,1 ± 0,1 Receiver Correction: Sine wave voltage Pulse absolute calibration Pulse repetition ± 1,0 ± 1,5 ± 2 ± 0,15 ± 0,2 ± 0,2
14 Analog to Digital Receivers Uncertainty Budget Comparison PMM MHz 3 GHz Item (Receiver Specification) CISPR Specified Uncertainty (db) Digital Receiver Uncertainty (db) Receiver Reading ± 0,1 ± 0,1 Receiver Correction: Sine wave voltage Pulse absolute calibration Pulse repetition 20 Hz Pulse repetition 1Hz ± 1,0 ± 1,5 ± 1 ± 2 ± 0,3 ± 0,5 ± 0,2 ± 1,3
15 9030/9060 direct antenna matching via Fiber Optic An innovative way to reduce uncertainty: bringing the receiver to the antenna! Digital signal from ADC
16 A simple test: coax cable vs. f/o 1) Simulation of an antenna connected to the receiver by coaxial cable Chamber 3 GHz EMI Receiver PMM full CISPR compliance m Coax cable RG213U N N transition Fiber Optic Digital Link
17 A simple test: coax cable vs. f/o 2) Simulation of: direct connection antenna receiver remote unit receiver main unit connected by fiber optic Chamber 3 GHz EMI Receiver PMM full CISPR compliance Fiber Optic Digital Link
18 dbuv A simple test: coax cable vs. f/o 1) Simulation of an antenna connected to the receiver by coaxial cable Gen Pulsed 1 Hz -> Cable -> RX PK QP C-AVG
19 dbuv A simple test: coax cable vs. f/o 2) Simulation of: direct connection antenna receiver remote unit receiver main unit connected by fiber optic Gen Pulsed -> RX PK QP C-AVG
20 db A simple test: coax cable vs. f/o Loss of dynamic range PK QP C-AVG Additional loss: antenna factors
21 dbuv Gen Pulsed 1 Hz -> Cable -> RX PK QP C-AVG Coax cable reduces sensitivity. Lower sensitivity could lead to incorrect weighting Thus, usually a preamplifier close to antenna is used BUT Account for mismatch uncertainty twice First: Antenna/Preamp Second: Preamp/Receiver
22 ANALOGUE TO DIGITAL UNCERTAINTY COMPARISON Input Quantity Analogue uncertainty contribution (typical) in db PMM 9010 uncertainty contribution Receiver reading ±0,1 Equal or better Aging TBD, but present Absent Attenuation: Antenna-receiver Cables Connections ±0,1 TBD, but present TBD, but present Equal Absent Absent Receiver correction: Sine wave voltage Pulse amplitude response Pulse repetition rate response ±1,0 ±1,5 ±1,5 Better Better Better Mismatch: antenna-receiver antenna-cable cable-cable +0,9/-1,0 TBD, but present TBD, but present Equal Absent Absent Cable-Antenna (or other transducer, e.g. E.M. clamp) balance ±0,9 Better (w/ ) Cables coupling to ground TBD, but present Absent with 9030 or 9060
23 Other benefits from Split Architecture No expensive coaxial cables No cable loss No cable/antenna coupling No cable scattering No connectors loss Antenna decoupling not needed Higher flexibility of Optical cable Longer connection distance (100 m)
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