Re: Ground loop isolator recommendations?
- From: John Larkin <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 20 Jul 2005 08:18:32 -0700
On 19 Jul 2005 17:13:20 -0700, "davidd31415" <davidd31415@xxxxxxxxx>
wrote:
>Hi,
>
>I'm trying to remove a 60Hz hum from the outputs of a 3phase amplifier
>used to control an electro-dynamic shaker. I am guessing that the hum
>is being caused by a ground loop between the amplifier controller and
>the amplifier itself (coax connection).
>
>Are there many differences between the brand/styles of ground loop
>isolators? How do these devices work?
>
>I had a Radio Shack isolator which recently seemed to be introducing
>more noise than it removed from the system. I'm hoping the isolator is
>broke and not something else in the system.
>
>I would like to find something of industrial durability to use; if
>anyone has recommendations please post them!
>
>I've been told that the noise could be introduced by other devices
>leaking current to ground, or noisy current leaked between AC mains
>transformers through capacitance. I don't quite have an understanding
>of the last reason there, but if the problem is with the building
>wiring what methods could I use to check/fix this?
>
>Thanks,
>
>David.
>
>
>Thanks,
>
>David.
Here's the good stuff:
http://www.allenavionics.com/VHumElim/VHumElim.htm
The classic loop killer is just a lot of turns of coax wound on a
high-mu transformer core, with response down to DC and no actual
electrical isolation. This adds a lot of common-mode impedance but
doesn't affect the normal-mode signal path.
John
.
- References:
- Ground loop isolator recommendations?
- From: davidd31415
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