HP 5254C - SECTION I GENERAL INFORMATION; DESCRIPTION; SPECIFICATIONS; INSTRUMENT IDENTIFICATION

Model
5254C
Section
I
SECTION
I
GENERAL
INFORMATION
1-1.
DESCRIPTION.
1-2. The
Hewlett-Packard
Model
5254C
Frequency
Converter
is a
plug-in
unit
which
extends
the
frequency
measuring
capability
of an
HP
Electronic
Counter
rrom
. 15
to 3.
0 GHz
(150
MHz
to
3000 MHz).
1-3.
The
stability
and
accuracy
of
the
basic
counter
are
retained
by
multiplying
a
10-MHz
signal,
derived
from
the
1-MHz
internal
time
base
of
the
counter,
to
50
MHz and
selecting
a
harmonic
frequency
between
200
and
2950
MHz.
This
known
harmonic
of
50
MHz
is
then
heterodyned
with
the
INPUT
signal.
The
resulting
dif-
ference
frequency,
if
between
1
MHz
and
53
MHz
(band-
width
of
amplifier
in
plug-in)
is
counted
and
displayed
by
the
counter.
The
frequency
of
the
INPUT
signal
is
then
indicated
by
the
combination
of
the
MIXING
FRE-
QUENCY
control
(in
gigahertz;
front
panel
of
plug-in)
and
the
digital
display
of
the
counter
(in
megahertz).
1-4.
A front
panel
meter,
by
monitoring
the
differ-
ence-frequency
output
of
the
plug-in
to
the
counter,
aids
in
selecting
the
desired
MIXING
FREQUENCY
and
also
in
determining
if
INPUT
signal
amplitude
is
adequate
for
accurate
frequency
measurement.
Table
1-1.
1-5.
SPECIFICATIONS.
1-6. Table
1-1
contains all
technical
specifications
for
the
Model
5254C when
operated in
the
HP Elec-
tronic
Counter.
1-7.
INSTRUMENT
IDENTIFICATION.
1-8.
Hewlett-Packard
uses a
two-section
serial
number
mounted on
the
rear
panel.
Earlier
instru-
ments
use
an
8-digit
serial
number
(000-00000).
The
first
three
digits
are
a
serial
prefix
number:
the last
five
digits
refer
to
the
specific
instrument.
Later in-
struments
use
a
9-digit
serial
number
(OOOOAOOOOO).
The
first
four
digits
are
the serial
prefix and
the last
five
digits
refer
to
the specific
instrument.
If
the
serial
prefix
of
your
instrument
differs
from that
listed
on
the
title page
of this
manual,
there
are dif-
ferences
between
this
manual
and
your
instrument.
Lower
serial
prefixes
are
documented
in Section VII,
and
higher
serial
prefixes
are
covered
with manual
change
sheets
included
with
the manual.
If
the change
sheet
is
missing,
contact
the
nearest
Hewlett-
Packard
Sales
and
Service
Office
listed
on
the
inside
real’
cover
of this
manual.
1-9.
COOLING.
1-10. The
Model
5254B
is
cooled by
the
ventilation
system
of the
counter in
which it is
installed.
See
the
service
manual of
counter
for
cooling
system
and
maintenance
instructions.
Specifications
OPERATING
FREQUENCY
RANGE: 0.
15 to
3 GHz
(0.
2 to 3
GHz for
5254B).
MIXING
FREQUENCIES:
0. 15 to 3
GHz
in
50 MHz steps (0.
2 to 3 GHz
Tor
5254B).
INPUT
VOLTAGE
RANGE: 50
mV
(-13
dBm)
to 1
V
(+13
dBm) (min.
to
max. rms).
MAXIMUM
INPUT
OVERLOAD:
2.
2V
rms
(+20
dBm)
125
V
dc.
NOMINAL
INPUT
IMPEDANCE:
50 ohms.
INPUT
COUPLING:
AC.
RESOLUTION:
1
Hz in
1
sec.
,
10
Hz
in
0.
1
sec.
,
etc.
ACCURACY:
Maintains
counter
accuracy.
REGISTRATION:
Counter
display in
MHz
is
added
to
converter
dial
reading.
LEVEL
INDICATOR:
Meter
aids
frequency
selection
and
indicates
usable
signal
level
AUXILIARY
OUTPUT:
1
to
50
MHz
on
front
panel.
INPUT
CONNECTOR:
Type
N female.
WEIGHT:
Net, 5
lbs
(2,3
kg).
Shipping,
1
lbs
(3,2
kg).
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