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HEDT-5145103 bảng dữ liệu(PDF) 2 Page - Agilent(Hewlett-Packard)

tên linh kiện HEDT-5145103
Giải thích chi tiết về linh kiện  High Temperature 140-C Three Channel Optical Incremental Encoder Modules
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HEDT-5145103 bảng dữ liệu(HTML) 2 Page - Agilent(Hewlett-Packard)

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the adjacent pair of detectors. The
photodiode outputs are then fed
through the signal processing
circuitry resulting in A, A, B, B, I
and I. Comparators receive these
signals and produce the final
outputs for channels A and B. Due
to this integrated phasing
technique, the digital output of
channel A is in quadrature with
that of channel B (90 degrees out
of phase).
The output of the comparator for
I and I is sent to the index
processing circuitry along with
the outputs of channels A and B.
The final output of channel I is an
index pulse Po which is a one
state width (nominally 90
electrical degrees), high true
index pulse. This pulse is
coincident with the low states of
channels A and B.
Block Diagram
The HEDT-9040 and 9140 have
two channel quadrature outputs
plus a third channel index output.
This index output is a 90
electrical degree high true index
pulse.
The HEDT-9040 is designed for
codewheels which have an optical
radius of 23.36 mm (0.920 in.).
The HEDT-9140 is designed for
codewheels which have an optical
radius of 11.00 mm (0.433 in.).
The quadrature signals and the
index pulse are accessed through
five 0.025 inch square pins
located on 0.1 inch centers.
Resolutions between 360 and
1024 counts per revolution are
available. Consult local Agilent
sales representatives for other
resolutions.
Applications
The HEDT-9040 and 9140
provide high temperature motion
control detection at a low cost,
making them suitable for automo-
tive and industrial applications.
Note: Agilent Technologies
encoders are not recommended
for use in safety critical
applications. Eg. ABS braking
systems, power steering, life
support systems and critical care
medical equipment. Please
contact sales representative if
more clarification is needed.
Theory of Operation
The HEDT-9040 and 9104 are
emitter/detector modules.
Coupled with a codewheel, these
modules translate the rotary
motion of a shaft into a three-
channel digital output.
As seen in the block diagram, the
module contains a single Light
Emitting Diode (LED) as its light
source. The light is collimated
into a parallel beam by means of a
single lens located directly over
the LED. Opposite the emitter is
the integrated detector circuit.
This IC consists of multiple sets
of photodetectors and the signal
processing circuitry necessary to
produce the digital waveforms.
The codewheel rotates between
the emitter and detector, causing
the light beam to be interrupted
by the pattern of spaces and bars
on the codewheel. The
photodiodes which detect these
interruptions are arranged in a
pattern that corresponds to the
radius and design of the
codewheel. These detectors are
also spaced such that a light
period on one pair of detectors
corresponds to a dark period on


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