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How loud is your Agilent E3600 series power supply?


I just unpacked and powered up a new E3647a and it has an unusually loud mains hum... akin to a cheap florescent light fixture (ie. with a poor ballast). That is with the outputs off. When under load it changes somewhat but not significantly. Definitely sounds like transformer noise / vibration. Otherwise, all else seems to be ok.

It is many times louder than my Rigol DS2072 scope, my laptop, or anything else in my office for that matter. Is this normal?


I have an HP 6234A (a older model than the E3600 series, but of a similar design). It has a noticeable 60Hz hum when on. The noise doesn't seem to change under with load.


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