Technical data

Maximum levels for radio interference generated by equipment connected to the pub-
lic network or DC-power source. The demands on emission levels are selected so
that interference generated by equipment during normal operation in homes, offices,
shops and similar environments do not exceed a level that obstructs other equipment
(for example, radio receivers) from working as intended.
1.2 ITE emissions
EN 55022 Information technology equipment (ITE) – Radio disturbance
characteristics – Limits and methods of measurement.
… Measurement methods and limit values for radio interference generated by ITE.
… Class B, ITE is intended for homes, offices, shops and similar environments. Does not
provide with guaranteed protection against the effects of radio and TV reception
when ITE is used at a distance less than 10 m (32.8 ft) from the receiver antenna.
… Class A, ITE is intended for all other environments (for example, industrial). Does
not provide with guaranteed protection against the effects of radio and TV recep-
tion when ITE is used at a distance less than 30 m (98.42 ft) from the receiver
antenna.
1.3 ITE immunity
EN 55024 Information technology equipment (ITE) – Immunity characteristics
– Limits and methods of measurement.
… Test requirement on ITE equipment for immunity to continuous and transient, con-
ducted and radiated disturbances, including electrostatic discharges. Immunity
requirements provide a satisfactory level of inherent immunity so that equipment
works in the intended manner in its environment.
16 Theoretical and general applications www.westermo.com
1.1 General emissions
EN 61000-6-3 EMC – Generic standards – Emission standard for residential,
commercial and light-industrial environments.
Emission
Immunity = Tolerance against environmental effects.
Emission = Influence on environment (emanated energy).
The emission level is approx. 100 000 times lower than what our equipment handles
in terms of immunity.
Immunity
B A C K