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CHECKING AND
ADJUSTING
GENERAL
INFORMATION
The
following information
provides the
complete
checking
and
adjusting
procedure
for
the instrument
As
various
control functions are interdependent,
a certain
order of
adjustment
is
often
necessary.
The
procedure
is,
therefore, presented
in
a
sequence
which
is
best suited to
this
order,
cross-reference
being
made
to
any
circuit
which
may
affect a particular
adjustment.
Before any
check, the instrument
must
attain
its
normal
operating temperature.
—
Warming-up
time under
average conditions
is
30
minutes.
—
Adjustments
should be
made
after
60 minutes
—
Ambient
temperature
(23
±1)®C
—
Mains
voltage,
nominal
values
±10
%
—
The
cabinet
must
be
closed
and
should be
removed
only
for a short
time
for
adjustment.
—
Where
possible,
instrument
performance should
be
checked
before
an adjustment
is
made.
—
All
limits
and
tolerances given
in
this
chapter
are calibration guides,
and
should not be
interprets
as
instrument
specifications unless
they
are also
published
in
chapter
1.2.
of the
Operating
Manual-
—
Tolerances
given are for
the instrument
under
test
and
do
not include
test
equipment
error,
—
If
not
explicitely stated
otherwise, the voltage potentials
refer
to the
relevant
contact measured
against
measuring
earth
(
»L).
RECOMMENDED
TEST EQUIPMENT
—
The
following abbreviations
are
used
for settings
and
for
the
test
equipments:
X
T
o-
20 dB
Vac,
Vdc
OSC
C/T
SPA
FAM
*
PMTR*
CTV
CTVS
SV
=
selected
parameter
mode
or input
= keep
setting
concerned
= parameter not
used
=
output not terminated
=
output, terminated with
50
^2,
e. g.
HP
10100C
=
attenuator
20 dB/50
Ji,
e. g.
Midwest microwave
313
=
Digital
multimeter
for a.c.
and
d.c,
measurement,
e.
g.
PM
2534
=
Oscilloscope
100
MHz
e. g.
PM
3267
= Counter/Timer
e. g.
PM
6665/421
= Spectrum
analyzer
1
GHz
e. g.
TR
4132
SPA
setting:
BW
=
bandwidth,
SW
=
scan
width,
ST
=
scan
time
= Modulation
analyzer
e.
g.
R&S
FAM/B2/B8
=
Power
meter
1
GHz
e. g.
HP 436A
+
Sensor
8482
A
or
R&S URV5
+
URV5-Z2
=
CTV
-receiver
=
PAL
pattern generator
e. g.
PM
551
=
RF-millivoltmeter
R&S URV5
*
Instead
of
single
instruments Modulation analyzer and
Power
meter
a
Modulation
analyzer
HP
8901
B,
which
includes a
Power
meter,
is
available;
range
150
kHz
-
1300
MHz;
Power
sensor
11722
A.
For
units
1,
2,
3
extension boards
are available,
to be
ordered
directly
via
Supply
Centre
Service
h\a^
burg; they have
no
service
code number.
For
the
test
PROM
see
chapter
6.2.
On
the
next page
you
find
a
conversion
table for
dBm/voltage
values; this table
you
can
also find
in
the operating manual,
fig.
33.
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