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Title: Voltage Envelope Vs. Power Envelope
Author: Woo Chi
Source: 2006 Measurement Science Conference
Year Published: 2006
Abstract: According to the IEEE definition, pulse parameters are defined at 10%, 50%, and 90% of the pulse. But this does not specify whether the definition is in terms of the voltage or the power. In the department of defense (DOD), many IFF/TACAN and other radar equipment uses the pulse modulated microwave signal for transmitting/receiving information. There is a clear distinction between two definitions, but it was not apparent in the old days when the measurement was made using a crystal detector and an oscilloscope. Nowadays, more precise techniques are available such as peak power analyzers and high bandwidth oscilloscopes. This advance in technology revealed the difference between the two definitions more clearly but also caused confusion on which definition to follow. This paper will examine the difference between voltage envelope and power envelope, then show an actual case that occurred during a NAVAIR standard procurement. The confusion over the specifications led to one manufacturer making the test equipment using the voltage definition, and another manufacturer using the power definition. Finally, recommendations will be made on steps to prevent this in the future.

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