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(4)
Connect
the
oscilloscope lead
to
the inner pin of the
Internal
Standard
Output
socket
on
the rear
panel of
the
UUT
(screen
to
chassis)
.
(5)
Set the
UUT
frequency
standard switch
to
INTERNAL.
(6)
Observe
the oscilloscope display
and check
that
in
a period of 10
seconds not
more
than
one
cycle of displayed
waveform moves
past a
fixed point
on
the oscilloscope face.
This
is
equivalent
to
an
accuracy
of
1
in
10 7
.
(7)
If
necessary, adjust
the
mechanical
tuning
via the aperture
in
the rear
panel
to
obtain a
stationary trace.
INTERNAL
REVERSE
POWER PROTECTION
UNIT
OPTION
5.50
Test
Equipment
Required
Power Meter
Signal
Generator
Power
Amplifier
Cable
with
N-N
connectors
Page 5-2
Table
5
Item
1
1
Item 14
Item
1
5
5.51
Procedure
(1
)
Set the
UUT
controls as follows:
OUTPUT
switch
to
NORMAL
METER
switch
to
CW
OUTPUT
LEVEL
to
-20
dBm
Modulation
controls
OFF
(2)
Tune
the
UUT
to
6
MHz
and
adjust
the
VERNIER
control
to
give a
reading
of
OdB on
the
UUT
meter.
(3)
Connect
the Signal
Generator
to
the
RF
Amplifier.
Set the Signal
Generator
to
give
an
output from the amplifier
of
100
MHz
at
a level
of
-30
dBm
.
(4)
Connect
the amplifier output
to
the
50
Q
RF output socket of the
UUT
.
Slowly
increase the Signal
Generator
output
level
until
the
UUT
protection
unit
buzzer
sounds.
(5)
Disconnect
the amplifier output from the
UUT
50
Q
RF output socket.
The
buzzer
should
stop
sounding.
(6)
Measure
the amplifier output, using the
Power Meter. The
level
should
be
within the range
0.2W
to
1W.
(7)
Disconnect the
test
equipment.
9081
&
9082 Vol.2.
5-31
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