Operation Manual, RA2400 & RA7300 Power Amplifiers
Page 21
Document # 9301H62800 Ver. 1.00
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The ultimate solution to this type of problem is to re-wire your house with an isolated, star type-
grounding configuration. We recognize, however, that this may be impractical and expensive. In
some cases, the use of an approved AC Power Isolation Transformer of sufficient capacity may
solve this problem.
Warning: if you suspect that the grounding system in your home’s electrical wiring is
causing the hum problem, it is important that you do not make any changes to the wiring
yourself. Only a licensed electrician should make any changes to household wiring, and
they must be made in full compliance with all local building, safety and electrical codes.
Suggestion #4:
Hum may also be caused by faulty earth grounds in your home’s electrical system.
In the past, cold water pipes were often used for the earth ground so it is important to make sure
that your ground connection is still valid and has not become loose or corroded. The cold water
pipe method may no longer be valid in some locations due to local requirements that the water
meter be isolated from the water mains with a length of PVC pipe, thus interrupting the ground
circuit. The safest and most reliable approach may be to provide your own ground. This can be
accomplished by having a licensed electrician install a new ground which normally involves
inserting at least five feet of a copper-jacketed steel grounding rod into the earth. Electrical
connection would be made to that and you’d use it as your grounding connection.
If the hum persists after all of the above suggestions have been tried, contact the Datasat
Technical Support for assistance: Email
or (if you are located in or close
to Europe)
