iPAM400 – Product Manual
U-0629-0171.doc – Issue: 04 complete, approved
Page 58 of 138
5.4 Avoiding Ground Loop Problems
It is possible to form a ground loop when connecting pieces of audio equipment using unbalanced
connections that provide alternative earth connections via their cable screens. Such ground loops result in
audible ‘hum’ from the system.
!
!
Never disconnect the mains earth from the plug to attempt to cure a ground loop. The
equipment casing could become live in the event of a fault.
The recommended method of wiring low-level signal interconnections to preserve EMC (Electromagnetic
Compatibility) performance and minimise the likelihood of ground loops is as follows:
1) We always recommend screen to shell connection for best EMC performance, but break the
connection at the source end if a ground loop problem is encountered. In practice, the connections
between this equipment are balanced and short and it is unlikely that ground loop problems will be
encountered.
2) It is also possible to switch the rear panel EARTH LIFT switch to the UP (
, OFF) ‘ungrounded’
position. In some cases this may cure the problem.
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