HP AC-4A User Manual

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The
Amplitude
Discriminator
puts
out
pulses
as
long
as
it
receives
an
input
of
sufficient
amplitude;
however,
pulses
cannot
operate
the
AC
-4A
Decade
Counters
unless
the
GATE
is
open.
This
GATE
may
be
a
simple
ON-O
FF
switch
as
shown
in
F
ig.
2,
a
pair
of
relay
contacts,
a
vacuum
tube
biased
in
and
out
of
cut-off,
a
diode
arrange-
ment
or
other
circuit
configuration,
depending
upon
the
speed
and
accurac
y
requirements
placed
on
the
GATE
by
the
application.
AC-4A
DECADE
COU
N
TERS,
which
count
all
pulses
from
the
Amplitude
Discriminator
when
the
GATE
1s
O
PEN.
When
the
GATE
is
CLOSED,
the
AC-4A's
remain
indefi.nitely
on
the
last
count
received
and
display
the
total
as
one
numeral
in
each
decade
illuminated
b y a
neon
lamp.
The
output
of
one
AC
-4A
Decade
Counter
will
drive
the
input
of
the
next
without
additional
circuitry.
RESET
.
It
is
usually
desirable
to
return
all
AC-4A
1
s
to
zero
before
beginning
a
new
count.
All
AC-4A
1
s
can
be
reset
to
zero
s i
multaneously
with
a
RESET
switch
as
shown
in
F
ig.
2,
or
in
automatic
counting
equipment
this
can
be
done
with
a
thyratron
circuit
as
shown
in
Fig.
8 or F
ig.
9.
-2-
'

HP AC-4A Specifications

General

Brand	HP
Model	AC-4A
Category	Cash Counter
Language	English