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The pulse generation circuits compare the two input signals (derived from the incoming refer-
ence and measurement signals) with respect to frequency. The outputs from these circuits
are 40 ns pulses (one pulse represents 1/2 cycle difference between the reference and mea-
surement signals).
If
the reference signal frequency is higher, pulses occur on the down-pulse
line; if the measurement signal frequency is higher, pulses occur on the up-pulse line.
Error
detect
circuits
monitor
the
incoming
reference
and
measurement
signals
for
extreme
frequency
excursions.
If
the
frequency
deviates
from
its
nominal
value
by
greater
than
preset
limits,
a
panel
light
illuminates
and
the
two
input
signals
are
inhibited
from passing
to
the
pulse generation
circuits.
These
extreme
frequency
excursions
occur
when
the
system
optical
devices
are
moved
at
too
rapid
a
rate.
For additional information and schematics, refer to the 10781A Pulse Converter Operating
and Service Manual.
3.21 10763A English/Metric Pulse Output
The
10763A
English/Metric
Pulse
Output
card
i s
the
system
controller
for
the
coupler
back-
plane.
It
issues
instructions
to the
counter,
multiplier,
and
compensation
cards,
which
con-
verts
the
incoming
reference
and
measurement
signals
into
compensated
displacement
infor-
mation
in
the
form
of
a
28-bit
binary
number
on
the
backplane.
The
pulse
output
card
uses
this
data
to
generate
up-down
or
A-Quad-B
signals
representing
total
change
in
position.
Figure
3-78
is
a
block
diagram
of
the 10763A.
LjiiGL
a
Next State
28-811 UplDown Countw
F
=
Front
Edge
of
Card
All
Others
Go
to
Coupler
Backplane
-~
-
I
state
VOL
A-Quad-B
Instruction
fi
Latch and Dliva
Figure
3-T8.
10763A
English/Metric
Pulse
Output
Block
Diagram
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