Notes on Electromagnetic Compatibility
SCHOEPS
CMC microphone amplifiers are vir-
tually immune to magnetic, electric and elec-
tromagnetic fields.
Due to the wide dynamic range of studio
microphones, the smallest signal amplitudes
are in the microvolt range (1/1,000,000 Volt).
Cable shielding and the grounding scheme of
the preamp or mixer input are also crucial.
A microphone can therefore never be expected
to be immune to all possible disturbances in all
circumstances, but the following suggestions can
help to reduce any noise induction:
1) Keep both the microphone and the cable
away from sources of interference such as
monitors, digital equipment (computers),
RF emitters (mobile phones and other per-
sonal communication devices that emit radio
frequency energy), power transformers,
power lines, SCR dimmers, switching power
supplies etc.
2) Use only high-quality cables with a high
degree of shield coverage, e.g.
SCHOEPS
K EMC 5 U.
3) Keep all cables as short as possible.
4) Dress audio cables away from power cables.
If they must cross, it should be at right angles.
5) At the preamp or mixer input, the shield of
the microphone cable should connect to the
chassis ground in the shortest way possible.
If necessary, this coupling can be capacitive.
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GmbH · Spitalstr. 20 · D-76227 Karlsruhe (Durlach) · Tel: +49 721 943 20-0 · Fax: +49 721 943 2050
www.schoeps.de · [email protected]
Hints on Avoiding Interference
21
English
