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Check:
FREQUEN
CY MEASUREMENT
Registration:
Stability:
Answer
Display Time:
Range:
Accuracy:
Input
Sensitivity:
Input lrnpedance:
Gate
Time:
Reads
In:
PERIOD
IVIEASUREMENT
Input
Requ
irements:
Input Impr:dance:
Measurement l?erlod:
Standard Frequency
C
o
unted:
Rea(i
s lrl:
sPECtFlcalloNs
Freque
ncy
Period
Time interval
Ratio
Total Everts
Five
places.
Output
pulse
available to actuate
trigger circuit Ior
mechanical
register providing
increased count capacity.
within
lO
parts per million per
week.
Can
be standardized with
standard
frequency transmission
from
wWV.
Variable
irom
0.
I to t0
seconds, Display
can
be
held
in
delin
ite
ly
iI
desired.
Panel
control provides automatic count oI I00 kc to assure :rccuracy
of
gate and
proper operation of counters.
l0 cycles/sec.
I20
kc.
Exteodable
to
220
kc by replacing
units
AC-4A DECADE with
an (EModel
AC-4B
DECADE.
11
courlt,
r,
stability
(see above).
.2 volt rms minimum. Direct
coupled
input.
(.
5
volt rms required
rvith
AC-48
above
120
kc.
)
Approxrnulely
I
megt;hnr shunted
by
50
p7rf,
0.
001,
0.
01,
0.
l,
1.
0 and
i0 seconds.
Ivlay be extended to any
multiple of I
or l0
seconds by
manual gate toggle
s1,itch.
Panel
neon
Iamp iirdicates
when
gate
is
open.
Cps
or
kc,
I-ighted decimai poiiit automatically positjoned.
.00001
cps to
10
kc.
Output
pulse
is
available to actuate
trigger
ciicuit for
mechanica,l
register to
extend
ratge to lo$'er frequency'
11
count, 1.3%, ,stability (see
Frequency Measurement)
Ior
mea-
surer']ent oI
one
period.
Accuracy
lor
nlore than
one
period
is
1.3116
divided
by number of periods
I
stability.
(This applies to
a
I
volt rl)]s
inprrt
si.€inal.
Accuracy increases
\ritI
greabe
r
input
signal
level.s.
)
.2 volt
rms
n]
inimum. Direct
couptred
input.
Approximately
I
megl)hm shunted by 50
i4l.
One
or
ten
cycles of
unknown
frequency,
May be extended to any
number
oi cycles oi
unknown
frequency by manual
control.
This is
Iimited to frequencies below
50
or
60
cycles/sec,
l,
t0,
I00 cps;
l,
I0,
100
kc.
Exlernal
irequercies
can
also
be used"
Seconds
or milliseconds.
Lighted decimal pointautonlai
jcaUy
po
sitioned.
I
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