The
∆
% unit is used to measure a frequency as a percentage difference
from another frequency. It is calculated similarly to the %, except that
it uses the difference between the measured frequency and the
reference for the numerator:
where Fr is the reference frequency and F is the measured frequency.
Phase units
.
deg – degrees, basic unit ofphase
Degrees (abbreviated deg) is the basic unit of phase difference
between two signals. Phase is generally measured on a 360-degree
scale, where 0 degrees means the two signals are in phase, 180
degrees means they are out ofphase, and by 360 degrees they are
back in phase. However, the scale may be shifted to span any
360-degree area, generally between –360 degrees and +360 degrees.
∆
%
= −
•
F
Fr
Fr
100
4
Oper
ati
o
n
Operation
Units : Phase units
4-76
Portable One Plus Access User's Manual
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