In-Cabinet Performance Check; Older Hp 5254A Instruments - HP 5254C Operating And Service Manual

Section VII
Model 5254C
A5R16
is
a factory selected part with a
typical
value
of
10k
ohms.
In
Paragraph
5-43d, connect
RF
milli-
voltmeter
to
AUX A
output
on
the rear
of
the
HP
5245L.
7-14.
IN-CABINET
PERFORMANCE CHECK
7-15.
The
HP
5254B
In-
Cabinet Performance Check
(Table
5-4)
can be used
for the
HP
5254A. However,
the
HP
5254A frequency range check covers 300
MHz
to
3000
MHz
instead
of
200
MHz
to
3000
MHz.
7-16.
TROUBLESHOOTING
7-17. Paragraphs 5-9 through 5-15 as well as
Table
7-2 can be used
in
troubleshooting
the
HP
5254A.
Figures
7-2, 7-3,
and 7-4 show
internal plug-in
views
with parts
indicated,
as well as
the
MP1
Cavity As-
sembly. Schematics
in
Figures 7-5 and 7-6
contain
A1 through A5 Assembly
circuits.
7-18.
OLDER
HP
5254A
INSTRUMENTS.
7-19.
This section applies directly
to
the
5254A Fre-
quency Converter having
serial prefix
numbers 514-
02175 and
above. This
section with the following
changes
also applies
to
52 54
A
Frequency Converter
having serial
numbers
514-02175 and
below,
429 and
415.
Instrument
Serial No. Prefix
Change
No.
514-02175 and below
1
429,
415
2
CHANGE
1:
Figure
7-2,
A5
Video Amplifier Assembly.
Make
the following changes:
A5R32:
change
to
2400
ohms*
A5E1:
delete*.
1.
Refer
to
the
Operating
Section
of
your
HP
Electronic Counter Operating manual
for counter
set-
tings
as well as
installation instructions
when
using
the
HP
52 54 A
plug-in.
2.
Connect
signal
whose
frequency
is
to be
measured
to
HP
5254A INPUT.
3.
Set
Mixing Frequency Control
to
read
slightly less than
.
3
GHz.
4.
Slowly turn Mixing Frequency Control counterclockwise
to obtain first
response, and
tune for a
maximum
reading
in the
green
portion of the
Level
Indicator
Meter
scale. (See Figure 3-1
for
examples
of
1, 2,
and
3
responses.
)
5.
Add
counter display
in
(kHz) to
Mixing Frequency Control reading (GHz)
for
frequency
of
input
signal.
7-2
Figure 7-1. Model
52 54
A
Operating
Procedure