Performance Check; General Information; General Functional Test - Philips PM 5390 Service Manual

5-1
5.
PERFORMANCE CHECK
5.1,
GENERAL
INFORMATION
WARNING:
Before
switching on, ensure that the instrument has been
installed
in
accordance with the
instructions
outlined
in
Section 2 of the Operating Manual: Installation instructions.
This
procedure
is
intended
to:
—
check
the instrument's specification
—
be used
for
incoming inspection to
determine the acceptability of
newly-purchased instruments
and/or recently-recalibrated instruments.
—
check
the necessity of recalibration after
the
recommended
recalibration interval
of
1
year.
ATTENTION:
The procedure does not check every
detail
of the instrument's calibration; rather,
it Is
concerned
prima-
rily
with those
parts
of the instrument
which
are essential
to
measurement accuracy and
correct opera-
tion.
Removing
the instrument covers
is
not necessary to
perform
this
procedure.
All
checks
are
made
from
the front panel.
If
this
test
is
started
within
a
short period after
switching on, bear
in
mind
that steps
may
be
out
of
specification,
due
to
insufficient
warming-up
time.
To
avoid
this situation,
allow the specified
warming-
up time
of
30
min.
5.2.
GENERAL FUNCTIONAL TEST
Immediately
after
power
being switched
on
a selftest
routine
is
performed under which
ROM
and
RAIVI
are tested.
If
a
fault
is
detected
a single
numeric
digit in
the
first
place of the frequency
field
on
the
display indicates
the location of the
fault.
The
rest
of
the display remains dark.
The
numeric
digits
are
assigned to the
memories
as follows.
1
ROM
2
RAM
3
CMOS-RAM
After
this
ail
segments and decimal points of the display
and
all
LEDs —only
the
'REMOTE'
LED
ex-
cepted—
are
switched
on
for
about 3 seconds
for testing.
When
the
selftest
routine
is
terminated, the display
will
show
its initial
reading:
000.000
MHz
0.000
MHz
.00
s
-127
dBm®
FREQUENCY AFREQUENCY SWEEP TIME LEVEL
For
further information
see
chapter
6.1
.
Error Messages.
Set the instrument
to
1
MHz
output frequency, -7
dBm
output
level;
check the
signal
by means
of
an
oscilloscope.
Set
the
step
attenuation to -8
dBm
and -17
dBm
and check the output
signal.
Perform frequency sweep from 10
MHz
to
15
MHz (AFREQUENCY
= 5
MHz), sweep time 0.50 5
;
check
the
output
signal
by means
of
an
oscilloscope.
Perform
TV
signal:
set
the instrument
to
175.25
MHz,
output
level
to
-27 dBm, modulation
VIDEO/
INT.FM, 'apply external
CVBS
signal
to the
VIDEO
input.
Check
the
TV
signal
by means
of
CTV
receiver at
VHF
channel 5
(E5).