radiated emission

Articles, guides, and products tagged "radiated emission" — a combined view of every catalogue resource on this topic.

User guide

E-scooter EMC/EMI engineering: EN 17128:2020 § 11 EMC requirements, CISPR 14-1:2020 emission + CISPR 14-2:2020 immunity for household appliances and battery chargers, IEC 61000-3-2:2018 harmonic current limits (Class A/B/C/D, equipment ≤16 A per phase), IEC 61000-3-3:2013 voltage fluctuation and flicker, IEC 61000-4-2:2008 ESD ±8 kV contact / ±15 kV air (Level 4), IEC 61000-4-3:2020 radiated immunity 3-10 V/m 80 MHz-6 GHz, IEC 61000-4-4:2012 EFT/burst ±2 kV power / ±1 kV signal, IEC 61000-4-5:2014 surge 1.2/50 μs voltage + 8/20 μs current combination wave, IEC 61000-4-6:2013 conducted RF immunity 3 V_rms 150 kHz-80 MHz, FCC Part 15 Subpart B Class B 100 μV/m @ 30-88 MHz / 150 μV/m @ 88-216 MHz quasi-peak (unintentional radiator), ETSI EN 301 489-17 V3.3.1:2024 BLE/Wi-Fi 2.4 GHz + 5 GHz + 6 GHz WLAN, motor controller PWM 8-20 kHz fundamental + 100s-MHz radiated harmonics from dV/dt 5-15 kV/μs MOSFET switching edges, common-mode current on phase wires acting as loop antenna, SMPS charger fly-back 50-200 kHz switching, Würth 742 711 21S / Fair-Rite Mix 31/43/44/77 ferrite-bead selection per frequency band, RC snubber 10 Ω + 1 nF per half-bridge, common-mode choke 3×2 mH soft-ferrite ring + 3×33 nF Y-cap, X2 (0.1-1 μF mains-to-mains) + Y1/Y2 (1-10 nF rail-to-chassis) safety-capacitor topology, ground-plane PCB return-path control, λ/20 aperture rule for shielded enclosure (≥20 dB attenuation), conductive EMI gasket (Chomerics ARclad / Würth WE-LT), AM-radio sniff DIY test 540-1620 kHz @ 9 m, smartphone BLE/Wi-Fi throughput diagnostic, RED 2014/53/EU mandatory presumption-of-conformity for Bluetooth/Wi-Fi radio modules, EMC Directive 2014/30/EU mandatory presumption-of-conformity for PLEV without radio

Engineering deep-dive into electromagnetic compatibility (EMC) and radio-frequency interference (EMI) on an e-scooter as the third cross-cutting infrastructure axis — parallel to [bolted-joint engineering as joining axis](@/guide/fastener-and-bolted-joint-engineering.md) and [thermal management as heat-dissipation axis](@/guide/thermal-management-engineering.md). Covers: 8-row standards matrix (EN 17128:2020 PLEV umbrella, CISPR 14-1:2020 emission, CISPR 14-2:2020 immunity, IEC 61000-3-2:2018 harmonics, IEC 61000-3-3:2013 flicker, IEC 61000-4-2:2008 ESD, IEC 61000-4-5:2014 surge, ETSI EN 301 489-17 V3.3.1:2024 BLE/Wi-Fi); 5-row interference-source matrix (motor controller PWM / SMPS charger / BLE radio / digital display+throttle / power-cable CM antenna); 6-row mitigation matrix (common-mode choke / RC snubber / clip-on ferrite bead / X+Y safety capacitor / PCB ground-plane + return-path / shielded enclosure + EMI gasket); 6-row test-method matrix (ESD ±8 kV contact / EFT ±2 kV / surge ±2 kV CM / radiated immunity 3-10 V/m / conducted immunity 3 V / harmonic ≤16 A); 6-row failure-diagnostic matrix (BLE drop / throttle creep / charger ground-fault / headlight flicker / AM-radio buzz / brake-light glitch); 8-step DIY EMI check (AM-radio sniff 540-1620 kHz @ 9 m, BLE/Wi-Fi throughput, ESD walk-test, visual ferrite/ground-strap inspection, chassis-to-DC- voltage measurement, surge-protected vs unprotected outlet comparison); 6-step DIY remediation (clip-on Würth/Fair-Rite ferrite, ground-strap tightening, shield-braid repair, antenna re-routing, IEC-marked charger replacement); RED 2014/53/EU + EMC Directive 2014/30/EU CE-marking presumption-of-conformity context; 15 numbered sections.

16 min read

User guide

Display and HMI engineering for electric scooters: sunlight-readability photometry (CR, cd/m², transflective LCD), glanceability ergonomics (ISO 15008, NHTSA 2-glance ≤ 2 s / 12 s, Fitts' law, Frutiger/DIN 1450), adaptive brightness (Weber-Fechner, PWM flicker per IEEE 1789-2015), environmental robustness (IP66, ISO 16750-3 vibration, IEC 60068 thermal −20…+70 °C), EMC (CISPR 14-1, ECE R10) and functional safety (IEC 62368-1, ISO 13849-1)

An engineering deep-dive into the one bidirectional channel between e-scooter and rider — paired with the introductory survey «Display, throttle, and error codes» (parts/display-throttle-error-codes): matrix physics (TN LCD with 90° twisted nematic vs IPS LCD with in-plane molecular switching vs OLED with organic electroluminescence via electron-hole recombination vs E-paper with electrophoretic ink); sunlight readability as a photometric problem (contrast ratio CR=(L_max+L_amb·R)/(L_min+L_amb·R) with ambient reflection, why a 250 cd/m² LCD against 100 000 lx direct sun drops to CR=1.05:1 without an anti-reflective coating, and transflective LCD as a hybrid with ambient backlight); glanceability as safety-critical ergonomics (ISO 15008:2017 in-vehicle visual presentation with minimum character-height-to-distance ratio 1:200, ISO 9241-303:2011 visual ergonomics, NHTSA Driver Distraction Guidelines 2013 + SAE J2364 2-glance principle ≤2 s single + ≤12 s total, Fitts' law T=a+b·log₂(D/W+1) for button-reach time, sans-serif Frutiger 1976 + DIN 1450:2013 Schriften — Leserlichkeit, kerning, x-height ≥60 % cap-height); adaptive brightness (Weber-Fechner logarithmic perception ΔI/I=const, ambient light sensor 0.01-100 000 lx, PWM dimming for LCD backlight with flicker frequency ≥1 kHz per IEEE 1789-2015 No-Observable-Effect threshold); environmental robustness (IEC 60529:2013 IP66 ingress dust-tight+powerful jets, ISO 16750-3:2012 road vehicle mechanical loads 10-2000 Hz random vibration, IEC 60068-2-1/-2 temperature −20…+70 °C cycling, IEC 60068-2-27 mechanical shock 1500g 0.5 ms half-sine, IEC 60068-2-30 damp heat 25/40 °C 95 % RH, ASTM B117-19 salt spray 5 % NaCl 35 °C 96 h); EMC (CISPR 14-1:2020 household-appliance emission, UNECE Regulation 10 Rev 6:2017 vehicle EMC 30 MHz-1 GHz radiated, ferrite chokes for PWM-backlight harmonic suppression); functional safety (IEC 62368-1:2018 hazard-based safety engineering with ES1/ES2 energy-source classes + PS1/PS2 power source + MS1/MS2 mechanical source, ISO 13849-1:2015 PL_d performance level so that display failure does NOT cause throttle/brake loss); and the full comparison matrix of 12 standards (ISO 15008 + ISO 9241-303 + ISO 9241-11 + NHTSA/SAE J2364 + IEEE 1789-2015 + IEC 62368-1 + IEC 60529 + IEC 60068-2 + ISO 16750-3 + CISPR 14-1 + UNECE R10 + ISO 13849-1).

18 min read