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Fig.
8
PULSE
WIDTH
MODULE
The
pulse
width
module
sets
the
pulse
width
of
the
main
front
panel
output.
The
input
is
a
TTL
pulse
from
one
of
the
two
outputs
on
the
clock
module,
selected
by
SWS.
If
the
ADVANCE
mode
is
selected,
the
SYNC
pin
of
the
clock
module
triggers
the
pulse
module.
If
the
DELAY
or
DOUBLE
PULSE
mode
is
selected,
the
OUT
pin
of
the
clock
module
triggers
the
pulse
module.
The
output
pulse
width
is
determined
by
the
resistance
across
pins
8 and
9 and
by
the
capacitance
across
pins
7
and
8.
The
capacitance
is
varied
in
steps
by
the
fixed
capacitors
on
the
PULSE
WIDTH
RANGE
switch
(SW6).
The
resistance
is
controlled
by
the
PULSE
WIDTH
FINE
potentiometer,
which
is
in
series
with
a
minimum
fixed
resistor
also
selected
by
SW6.
The
output
is
connected,
through
SW2,
to
both
the
PG-P
and
PG-N
modules
when
Sw2
is
in
the
INT
position.
Pin
connections
1.
No
connection
2.
TTL
Out
(to
pin
1 of
the
PG-P
and
PG-N
modules,
through
SWw2)
3.
TTL Out.
This
is
the
TTL
complement
of
pin
2.
Not
used.
4.
TTL
In.
Connected
to
either
pin
6
(SYNC)
or
pin
12
(OUT)
of
the
clock
module,
through
SW5.
5.
Ground
6.
Ground
8.
The
timing
capacitance
is
placed
across
these
pins
by
SW6.
8,9.
The
timing
resistance
is
placed
across
these
pins
by
PT4
and
SW6.
10.
Ground
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