EARTHING
Some experimentation may be required to find the best system of earth-
ing. In many studios equipment racks are earthed via a master earth star
point and earthing the RA402 directly to mains earth via its supply con-
nector may result in an earth loop.
If this is the case it may be necessary to disconnect the mains earth in
the supply connector. However it must be emphasised that this should
only be done after ensuring that the RA402 chassis is making good elec-
trical contact with the rack and that the rack is correctly earthed.
WHATEVER EARTHING SYSTEM IS USED THE CHASSIS OF
THE RA402 MUST CONNECT TO MAINS EARTH.
If there are still any problems try disconnecting the output cable screen
wires at the RA402 end and the input cable screen wires at the system
end. In this case a separate cable should be run from 0 volts in one can-
non to the system master earth point. This should prevent any earth
loops.
It should be noted that signal 0 volt connections are floating.
POSITION
Wherever possible the RA402 should not be mounted in close proximi-
ty to excessive heat producing equipment such as power supplies and
power amplifiers.
