New guide cures fluctuation and flicker headaches
A
REO product story
Edited by the Engineeringtalk editorial team
Oct 29, 2004
A new free guide explains everything anyone needs to know about the requirements of the latest flicker standards for EMC compliance.
EMC can be a real headache - especially when it causes voltage fluctuation and flicker that can induce migraines and even seizures.
Compliance with flicker standards is required for all equipment, if it is to conform with the EMC Directive when the self-declaration route to conformity is taken.
REO UK has, therefore, issued a free guide that explains everything anyone needs to know about the latest standards and cures headaches, both literally and metaphorically.
The guide is an invaluable aid to unravelling the requirements and differences of the two EMC standards - EN61000-3-3 and EN61000-3-11 - and gives useful advice on applying them.
These standards are called up by the EMC Directive to address the tolerance of the human vision system to fluctuations and flicker in light output from a 16W tungsten filament lamp.
Lighting flicker can cause annoyance, headaches, migraines and even seizures.
"Voltage fluctuations and flicker have been a problem for electrical supplies ever since the first public supplies were created in the 19th century", explains John Symonds, Director of REO UK.
"It is important to consider whether fluctuation and flicker emissions can be coped with by its intended power supply and this depends greatly on local line impedance".
"Engineers must therefore develop a good understanding of the requirements, in order to meet them".
Both EN61000-3-3 and EN61000-3-11 are horizontal EMC standards, and so they apply regardless of equipment.
Their scope covers all apparatus intended to be connected to the public LV supply.
EN61000-3-3 covers equipment that consumes up to 16A per phase, and EN61000-3-11 covers that which consumes up to 75A per phase.
Equipment that does not comply with the first standard must comply with the second and is subject to conditional connection.
In other words the user instructions must specify the appropriate supply specifications.
The REO guide covers full compliance testing for the standards as well as noncompliant and low-cost testing.
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