Many of the mysteries of equipment failure, downtime, software, and data corruption are the result of a problematic power supply. Compounding the problem is that there is no standardized way to describe power problems. Learn more about common power disturbances, what can cause them, and how to safeguard your critical equipment—all described in Institute of Electrical and Electronics Engineers (IEEE) standard terms.
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world you're in. Figure 1 shows what an average AC sine wave would appear like on an oscilloscope. The sinusoidal wave shape shown above represents a voltage changing from a positive value to a negative value, 60 times per second. When this flowing wave shape changes size, shape, symmetry, frequency, or develops notches, impulses, ringing, or drops to zero (however briefly), there is a power disturbance. Simple drawings representative of changes in the above ideal sine wave shape will be shown throughout