UPS RFIApril 16th Fact-of-the-Day
That high noise level you have been blaming on the power company may be coming from under your desk (or your neighbor's desk). Except for computers that have internal batteries, such as notepad and laptop computers, every computer should be protected from power failures by a UPS (Uninterruptible Power Supply), because a power failure during a disk write-operation can corrupt hard disk data, and in some cases, leave a computer unbootable. UPS's are widely used in homes and offices because of that. Unfortunately, many UPS's are poorly designed and are horrific radio frequency environment polluters. They sometimes are overlooked when someone is trying to find a noise source, because they continue to run when disconnected from power. Someone may switch off all power at a main breaker and think the interference they are trying to find must be coming from somewhere else, when, in fact, it is coming from one or more UPS's that keep on running. ©2005 Martek International All rights reserved.
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