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Sect.
I
Page
1
sEcil0il
r
Gt}IERAL
DTSCRIPTIOil
I,I
INIRODUCTTON
The Model 5228
Electronic
Counter
is
an
accurate
and
easy
to
use
instrument
for
frequency, period,
and
time interval measurements.
Frequency mea-
surements
from
10
cycles/sec.
to
120
kc*
and
period
measurements
from
.OO0O1
cycles/sec. to
10
kc may
be made
with
t}lis instrument.
The
instrument
and
display of the counted value may be preselected
for
automatic operation
or
set
to
any
desired interval
by manual
control.
This counter
is
suitable
ior
stardard audio-frequency
oscillators to yery high accuracy
and
facilitates re-
sponse
measurements
of
sharply
resonant
networks.
The
lrequency
stability oi oscillators
as a
function of
time
may
be measured
directly with this hstrument.
Transducers which
provide
an output
frequency
re-
lated
to t}le magnitude of such physical
constarts
as
measure
irequencies as high as
220
kc b!, simpLy
replacing
the
,'
UMIS',
AC -,1A
Decade
Counter unit
with
an
-hp-
Model AC-4B Decade Counter unit.
The decade
units plug
in
and
no
spec
ial adjustmerts
need
be
made.
weight,
pressure, temperature, smal] distances
and
force
may be used
with the electronic
counter
ior
increased accuracy
and
quickness
of reading. Excep-
tionally
accurate
tachometer measurements are ob-
tained by connecting
a
transducer, which translates
rotation into electrical impulses, to the input
oJ
the
counter.
I.2
INSPECTION
This instrument
has
been
thoroughly tested and
in-
spected
before being shipped
and
is
ready
for
use
when
received.
After
the instrument
is
unpacked,
it
should be
in-
spected
for
damage
received in
trarsit.
U any
ship-
pi.ng
damage
is
Iound,
follow
the
plocedure
outuned
in the "Claim
for
Damage
in Shipment"
page
at the
back
of t}Ie
instruction
book.
CAUTION
The sum of the
direct current
voltage
and
the
alter-
nating
current
peak
voltage applied to the input
ter-
minals ol
t}lis instrument
must not exceed
100
volts.
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