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In Reply to: RE: Tripplite Isolator mechanical noise posted by floydandrews on January 01, 2016 at 16:44:12
It's ironic that a device intended to reduce electrical noise can of itself produce a level of mechanical noise. The cause of the buzz is due to a magnetic property called magnetostriction, which is natural and not caused by a defective product. Positioning the isolation transformer behind the rack or elsewhere that blocks the mechanical sound may be beneficial. A simple vibration control device placed on top of the enclosure can substantially reduce the buzzing sound. However, I once used an isolation transformer in a small room that enhanced the volume of the mechanical buzzing sound, and had to resort to an extreme if not unsafe method of vibration control by positioning a half gallon plastic jug filled with water on top of the isolation transformer enclosure before the sound was dampened enough to be barely audible. That solution seemed too unsafe in theory if not practice, so I discontinued its use. Another isolation transformer application only required a single Eichmann Topper aluminum resonance dampening device placed on top of the enclosure to eliminate a low-level buzzing sound.
Follow Ups:
One way to reduce noise from this source is to remove any steel upper top which is close to the transformer. On occasions I had simply cut a circular hole or replace the top with an aluminium shield.
Isolating the transformer mechanically rarely works.
In 50Hz countries, US made transformers are often poor whilst Japanese source ones are almost always fine. It is down to the design.
It could be from DC on the line. DC causes transformers to mechanically hum.
A vanAlstine hum dinger will solve this problem. I use one before a 60lb toroid and it eliminates what slight hum it was making.
Edits: 02/10/16
I know some people who sand filled the enclosure of their balanced transformers! Noise killed!
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