Model
5245L
Section
I
,Paragraphs
1-1 to 1-10
SECTION
I
CENERAT
INFORMATION
I-I. INTRODUCTION.
L.2.
DESCRIPTION.
1-3.
The
HP
Model
5245L Electronic Counter
is a
high-frequency
general-purpose
electronic
courter.
The
Model
5245L
measures
frequencies from
0
to
50
Mfu,
periods
from
1
p.
sec
to 10
seconds,
period
averages from
10 to
1001000
periods,
the
ratio of two
frequencies,
andthe
multiplied
ratio
of hvofrequencies.
l-4.
The HP
Model
5245L
provides
these additional
features:
a.
Decade
scaling
to
1Og
for any frequency to
50 MHz.
b. Standard output
frequencies
from 0.1
Hz
to 10
MHz in
decade
steps.
c.
Four-line,
binary-coded-decimal output to drive
digital recorder
(HP
Model
562A), digital to analog
converter
(HP
Model 580A/581A),
remote readout,
or data
processirg;
equipment
(1-2-2-4
code;
L-2-4-8
code available
(see
Section
V).
€.
Display
storage whichpermits readingto
bedis-
played
while
new count is made.
d. Remote control
by
external contact closure avail-
able
(see
Section
V).
f. Eight-digit
display
using
rectangular
(narrow)
digitat
display
tube s; decimal
point
position
and
meas-
urement
units displayed
automatically.
g.
Operation
with
plug-in
units which extend the
basic range
and
performance
of the counter.
1-5.
The
Model
5245L features
solid state
design,
low
power
consumption, small size
(5-1/4
ineh
panel
height),
lightweight
(32
1b),
easy
conversionforrack
mounting,
and
modular
plug-in
circuit
boards
for
simplif ied maintenance.
I-6.
INSTRUMENT IDENTIFICATION.
t-7.
EachModel
5245Lis
identified
bya
two-section,
eight-digit
(000-00000)
serial
number
on
the
rear
panel.
The five-digit
number
is an identification
number
unique
to each instrument, and the three-digit
number
is
a serial
prefix
number, used
to
document
changes.
1-8.
AII
instruments
with
the same
serial
prefix
are
the
same. The
group
of
instruments
to
which
this
manual
applies
directly
is identified
on the
title
page.
For
older instruments
(lower
serial numbers),
make
manual changes
listed in Section VL
For newer
in-
struments, having serial
numbers higher
than those
listed
on the title
page,
a
Manual Change
sheet
is
in-
cluded, describing
the
required changes.
The manual
for
an instrument
having
special
electrical modifica-
tion
will include an insert sheetdescribing
thatmodi-
fication. If
a change sheet
or special information
sheet
is missing,
the
information can
be supplied by any
Hewlett-Packard
sales
and service office
listed
at the
back
of
this
manual.
I.9.
INSTALLATION
AND
OPERATION,
1-10.
Installation
and operation
procedures
are
covered in
Sections
tr
and
III of the Modet 5245L Op-
erating
Manual. An
explanation
of
the Counterts
con-
trols and connectors and a
self-check
procedure
is
included
in
SectionVI
of this
manual
(see
Figures 6-1,
6-2, and
6-3).
02349-1
1-1
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