What is it called when the 60hz line power becomes something else?

From: Huw Davies <H.Davies_at_latrobe.edu.au>
Date: Mon Jun 1 22:06:55 1998

At 04:23 PM 01-06-98 -0400, Carl R. Friend wrote:

> Shipboard applications are frequently run at 440 Hz as well as
>aircraft; it's quite common in military environments as it keeps the
>transformers small. Actually, I believe it's 400 Hz, not 440, but
>whats a few ticks between friends?

As the topic drifts away from computers, I've just got to ask how they
isolate equipment running at 440Hz (or 400Hz). 50Hz hum is bad enough, but
440Hz is rather
noticeable. Of course, for those of us with perfect pitch, we'd notice line
frequency changes of a few 10s of Hz. Perhaps I should volunteer for
aircraft line frequency monitor :-)

 Huw Davies | e-mail: Huw.Davies_at_latrobe.edu.au
 Information Technology Services | Phone: +61 3 9479 1550 Fax: +61 3 9479
1999
 La Trobe University | "If God had wanted soccer played in the
 Melbourne Australia 3083 | air, the sky would be painted green"
Received on Mon Jun 01 1998 - 22:06:55 BST