> Message: 4 > From: [email protected] > > That is a big concern of ours of course! > > It's a massive voice coil in the shaker.. > > bye, > Said > > > In a message dated 4/13/2010 11:20:16 Pacific Daylight Time, > [email protected] writes: > > True enough, but don't forget that a shaker table is a big > moving electromagnet right next to the device under test. I > would think that the shaker's field would dominate any such > errors, especially for larger tables running in random > vibration or pulse modes.
I think you'll find that any stray fields from industrial shaker systems, are often from the connecting leads, especialy if not correctly positioned and layed out. The internal static and dynamic magnetic fields are "Very" well contained. My example with the small speaker though, you could expect some field leakage. However, the speakers from old PC monitors (CRT types) are often very well shielded themselves, static and dynamic. The "injection stick" is a good method of moving such field away (inverse square law again) from the EUT. Of course, if the field is the problem, you'll see disturbance effects, long before the mechanical connection is made. Play and lean. Cheers. Dave B. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
