Cloud Electronics CX261 - Manual (Page 13)

CX261 User Manual v1.3 13
General Notes
EMC Considerations
The CX261 fully conforms to the relevant electromagnetic
compatibility (EMC) standards and is technically well behaved.
You should experience no problems interfacing units to other
items of equipment and under normal circumstances, no
special precautions need to be taken.
If the unit is to be used in close proximity to potential
sources of HF disturbance such as high power
communication transmitters, radar stations and the like, it is
suggested that input signal leads be kept as short as possible.
Always use balanced interconnections wherever possible.
If the CX261 is mounted in a 19” rack, do not locate the
unit in close proximity to a powerful amplifier of any kind,
which may radiate a strong magnetic field from the power
transformer.
Earthing
When several mains powered units are connected together
via their signal cables, there is a risk of one or more earth
loops which may cause an audible hum on the system even
with the gain controls set to minimum.
The 0 V rail of the CX261 is directly coupled to the
chassis ground. No interconnection problems should be
encountered, but if there is any hum or other extraneous
noise when source equipment is connected, the situation can
generally be remedied by observing the following guidelines:
•
Always connect the microphone inputs using balanced
connections wherever possible, with the cable screen
only connected at the mixer input.
•
Always connect the mixer outputs using balanced
connections wherever possible, with the cable screen
only connected at the destination (normally an amplifier
input).
•
Use audio isolating transformers (readily available from
trade suppliers) at the inputs and/or outputs if necessary.
These will ensure that the mixer is electrically isolated
from other equipment.
•
Both signal source units and amplifiers should be located
as close as possible to the mixer and the metal housing
of the various units should not be electrically connected
together through the equipment rack. If this is a problem,
rack isolating kits are available from specialist hardware
suppliers. If the problem persists, try to connect all
interconnected units, including power amplifiers to a
common power source to ensure a common ground is
provided.
Ventilation
The CX261 generates very little heat in normal operation
and is cooled by natural convection. However, note that there
are ventilation holes on the bottom cover, and these should
never be covered or obstructed. Installation in an equipment
rack is always recommended, but care should be taken
not to mount the unit immediately above another item of
equipment, as this will block the ventilation holes. If the unit
is to be used free-standing, stick-on rubber feet should be
attached to the bottom plate to ensure clearance from the
surface the unit sits on.