Most commercial phase meters have an inherent range of 0° to 360°. These instruments usually have a switching arrangement by means of which the range of angles from 360° lagging to 360° leading is covered in a number of sub‐ranges. In the development of a specialized computer, the complex plane scanner, a phase meter was required capable of measuring angles from 540° lagging to 540° leading in one continuous range without ambiguity of output. This paper describes a direct reading pulse position comparison instrument with an inherent range of from 720° lagging to 720° leading. The design is such that this range may be further extended, theoretically without limit. The accuracy of the instrument is ±1° for angles from 540° lagging to 540° leading and for input amplitudes from 0.1 to 100 v. While the phase meter described is designed for operation at a fixed frequency of 400 cps, modifications are suggested for adapting it to broad‐band applications.

Topics
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© 1957 The American Institute of Physics.
1957
The American Institute of Physics
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