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Noise

1. In process instrumentation, an unwanted component of signal or. See “interference, electromagnetic”. 2. Any spurious variation in the electrical output not present in the input. 3. An unwanted component of a signal or variable which obscures the information content. 4. Random variations of one or more characteristics of any entity, such as voltage, current, or data. 5. A random signal of known statistical properties of amplitude, distribution, and spectral density. 6. Loosely, any disturbance tending to interfere with the normal operation of a device or system


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