EET 422 EMC COMPLIANCE ENGINEERING Prof R T
- Slides: 21
EET 422 EMC & COMPLIANCE ENGINEERING Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 1
Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 2
Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 3
INFORMATION TECHNOLOGY EQUIPMENT (ITE) predominantly generates periodic & binary pulsed waveforms source of interference unintentionally coupled via interconnects signal or main leads direct radiation Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 4
ORGANISATIONS INTERACTION GENERIC STANDARDS immunity IEC emissions CISPR 22 conducted radiated immunity CISPR 24 61000 -6 -1 ‘residential’ 61000 -6 -2 ‘industrial’ IEC 61000 conducted EN 55022 radiated EN 55022 EN 61000 emissions CENELEC 61000 -6 -3 ‘residential’ 61000 -6 -2 ‘industrial’ Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 5
SCOPE of STANDARDS • electronic business equipment • telecoms terminal equipment • local area network equipment (LAN) • PCs servers mainframes • data processing & storage • printers and scanners Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 6
• EN 55011: 2007 industrial, scientific, and medical (ISM) equipment • CISPR 11 (industrial, scientific, and medical apparatus) • EN 55022: 2006 information technology equipment (ITE) • CISPR 22 ( information technology [IT] equipment) Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 7
EMISSIONS ENVIRONMENT CLASS ‘A’ Industrial Environments equipment spread over some distance separate transformer stations for mains supply Class ‘A’ applies to ITE that satisfies Class ’A’ limits but is outside the Class ‘B’ limits Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 8
EMISSIONS ENVIRONMENT CLASS ‘B’ commercial and light industrial environments domestic office laboratory apparatus or system connected to the public mains Residential Environment : more controlled Class ‘B’ applies to ITE that satisfies Class ’B’ limits in general no restrictions on its use Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 9
CONDUCTED EMISSIONS appear as currents are measured as voltages represented in limits as d. B m. V levels frequency range 150 k. Hz to 30 MHz Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 10
EN 55022 CLASS ‘A’ FREQUENCY AVERAGE LIMITS QUASI PEAK LIMITS 150 k. Hz - 500 k. Hz 66 d. Bm. V 79 d. Bm. V 500 k. Hz - 30 MHz 60 d. Bm. V 73 d. Bm. V Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 11
quasi-peak average Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 12
79 73 66 Prof R T Kennedy quasi-peak 60 EMC & COMPLIANCE ENGINEERING average 13
EN 55022 CLASS ‘B’ FREQUENCY AVERAGE LIMITS QUASI PEAK LIMITS 150 k. Hz - 500 k. Hz 56 -46 d. Bm. V 66 -56 d. Bm. V 500 k. Hz - 5 MHz 46 d. Bm. V 5 MHz - 30 MHz 50 d. Bm. V 60 d. Bm. V Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 14
quasi-peak average Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 15
quasi-peak 66 56 56 46 Prof R T Kennedy 60 average EMC & COMPLIANCE ENGINEERING 50 16
MEASUREMENT UNCERTAINTY quasi-peak “fail” limit + 3. 6 d. Bm. V limit - 3. 6 d. Bm. V “pass” / “fail” not proven Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 17
MEASUREMENT UNCERTAINTY quasi-peak average Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 18
MEASUREMENT UNCERTAINTY quasi-peak average Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 19
UNCERTAINTY 80 -80 RULE average of the n measured values function of the sample size standard deviation of the n measured values the measured value of product # n Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 20
UNCERTAINTY 80 -80 RULE 2 function of the sample size 4 5 6 7 8 9 10 11 12 2. 04 1. 69 1. 52 1. 42 1. 35 1. 30 1. 27 1. 24 1. 21 1. 2 Prof R T Kennedy EMC & COMPLIANCE ENGINEERING 21
