10
SPECIFICATIONS
Safety approvals
MARTIN AUDIO MA Series amplifiers are designed to meet EN60065
electrical safety standards.
EMC approvals
EMC stands for Electro Magnetic Compatibility. This implies that the
equipment should have low emission of radio frequencies, directly as
electromagnetic fields in the air and as conducted from the cables from and
to the unit. The unit should also be able to handle electromagnetic fields,
high voltage flashes and radio interference, coming into the unit via the air
or cables.
Emission
The regulations now cover the frequency range from 150kHz to 300MHz.
The maximum level radiated from a unit has to be below 100µV, (0.0001V).
Immunity
The equipment should be able to handle three different types of
interference:
•
Electrostatic discharges up to 8kV, hitting the chassis or cables.
• Transients and bursts up to 1kV conducted through the cables to the unit.
• Electromagnetic fields up to 3V/m, radiated on the unit and the cables
in the frequency range of 27 - 500MHz.
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 150kHz - 80MHz, 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 - 1000MHz,
with a level of 6V/m and 80% AM modulated.
In the range 895 - 905MHz, we test with field strength of 35V/m and 100%
pulse modulation. This emulates 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 -9dB under
clip point according to EN60065).
Martin Audio – MA1.3 Power Amplifier
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NGLISH
18
CONTENTS
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