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(3)
Tune
the
UUT
to
500MHz.
Adjust
the
UUT VERNIER
to
bring the
signal
to
the top graticule
line of
the
analyser
display.
The
UUT
meter should
read
+3
dB.
(4)
Operate
the
UUT OUTPUT
LEVEL
control
in
lOdBm
steps
and
observe lOdB
steps
on
the analyser
as
far
as
-60dBm.
(5)
Reset the following analyser controls:-
Input attenuation:
OdB
Log
Reference:
-50dB
(6)
Repeat operation
(4)
up
to
-120dB on
the analyser.
(7)
Disconnect
the
spectrum
analyser.
INTERNAL
STANDARD
OUTPUT
CHECK
5.46
(1)
Connect
a True
RMS
Mi
Ili
voltmeter
to
the
rear
panel standard
output socket,
using a
50QBNC
load
and
'T'
piece.
(2)
Check
that
the
STANDARD
switch
is
set to
INTERNAL
and
verify
a reading of
125mV ± 25mV
on
the Millivoltmeter.
(3)
Disconnect
the
test
equipment.
INTERNAL
FREQUENCY STANDARD
CALIBRATION
5.47
The
'cycle
drift'
method
of
frequency
calibration,
described
below,
is
suitable
for oscillators
which have
temperature
stability
characteristics
of
up
to
1
part
in
10^.
With
higher
stability oscillators,
such
as the
Racal 9421
and 9442,
specialised
equipment
such
as
the Tracor
Frequency
Difference
Meter Type
527A
should
be
used
if
the
optimum
calibration
is
to
be achieved.
5.48
5.49
1
MHi.
external
frequency
standard with
accuracy
better
than
one
part
in
10.
Oscilloscope.
Procedure
(1)
Allow
a suitable
warm-up
period (not
less
than
one
hour
for
a
temperature-control
I
ed
oscil lator)
.
(2)
Set the oscilloscope time base
to
1
microseconcj/cm.
(3)
Connect
the
1MHz
external standard
to
the External Trigger
input of the oscilloscope.
9081
&
9082
Vol
.
2
5-30
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