RE: EMC and computer microphonics

Can't say that I have ever heard the sound and I have EMC installed on 3
systems, but my wife is always telling me I am deaf.


Tim
[Denver, CO]

> -----Original Message-----
> From: daveland@... [mailto:daveland@...]
> Sent: Monday, July 19, 1999 9:17 PM
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: [CAD_CAM_EDM_DRO] EMC and computer microphonics
>
>
> From: daveland@...
>
> Hello
>
> Has anyone noticed that when EMC starts up the stepper tasks
> that your computer "whines" at the emc task rate? I have been
> searching for this anoying problem and it seems to come from the
> disk drives. I got a clue because the sound stops for an
> instant when the disks get busy. Is this a "microphonic"
> phenomena? i.e. vibration casued by the ripple in the supply or
> a control line? Any one else hear this? I have it on more than
> one machine.
>
> dave