Galil DMC-21x3, Руководство пользователя

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84 •Chapter 14 DB-28104 DMC-21x3 Accessories
Figure 41 Quadrature Encoder Signals
A sinusoidal encoder is similar to a quadrature encoder in that it produces two signals that are
read from two sets of lines inscribed on an optical disk. The difference is that the two signals
are output as analog sinusoidal waves as shown in Figure 4.
Figure 42 Sinusoidal Encoder Signals
When the motion controller is mated to the DB-28104, the position is tracked on two levels.
First, the number of coarse cycles is counted much like is done with a quadrature encoder. On
the fine level the precise position inside the cycle is determined from the two sinusoidal signals
using bit-wise interpolation. This interpolation can be set by the user in the range of 2
5
through
2
12
points per sinusoidal cycle
Channel A
Channel B
V
a
V
b