The equipment should be able to handle three
different types of interference:
• Electrostatic discharges up to 8 kV, hitting the
chassis or cables.
• Transients and bursts up to 1 kV, conducted
through the cables to the unit.
• Electromagnetic fields up to 3 V/m, radiated on
the unit and the cables in the frequency range of
27 - 500 MHz.
We have extended the tests in two cases and chosen a
standard used for heavy industrial situations. First, we
have tested conducted disturbances in the frequency
range 150 kHz - 80 MHz, by injecting 3V amplitude
modulated (80%) signals into all the cables ( inputs,
outputs and mains ). This covers noise from AM
transmitters, which are still in use in some areas.
Secondly, we have extended the range for
electromagnetic fields to 26 - 1000 MHz, with a level
of 6 V/m and 80% AM modulated.
In the range 895 - 905 MHz, we test with a field
strength of 35 V/m and 100% pulse modulation.
This
emulate the signals from a mobile phone close to the
unit. In all cases the noise plus distortion is below 1%,
at normal operation level, ( normal operation level is
1/8 of full power or -9 dB under clip point according
to IEC 65).
EMC-declaration
This audio power amplifier conforms with the
EMC-directive 89/336/EEC and relates to the
following standards:
EN 55013:1990
EN 50 082-1
IEC 801-2, ed.1(1984)
IEC 801-3, ed.1(1988)
IEC 801-4, ed.1(1984)
SS-ENV 50 141 ed.1 (1994)
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