ground loops? or lack of ground? how do you tell?

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turk 182

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Joined 2012
#1
As a service tech i've encountered all kinds of problems with respect to ground loops,bad grounds and lack of grounds altogether.
I guess my question is does anyone have a concise method for determining ground related noise problems?
 
#2
You have listed the problems. Look carefully at the circuit and the implementation details to see if any of them are present.

For example, each circuit point which should be grounded should have one and only one conductive path to the ground reference point. Nothing else should inject hum or buzz into this connection.
 
#10
One thing I learnt in my early days of soldering was the importance of a good earth.

An amplifier might have all the right earths connected to all the right places but if one connection is bad or one wire is too thin, the thing will hum like a bumble bee.
 
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