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LEVEL
ACCURACY CHECK
5.19
Test
Equipment
Required
Page 5-2
Table 5
Mil
I
i
voltmeter
(True
RMS)
Item 2
Cable
with
N-N
connectors
5.20
Procedure
(1)
Set the
UUT
controls as follows
AM
switch
to
OFF.
F/v\/)OM switch
to
OFF.
FINE
TUNE
switch
to
OFF
CHANNEL
SPACING
switch
to
'10
kHz'.
TUNE
switch
to
FAST.
OUTPUT
switch
to
NORMAL.
METER
switch
to
CW.
OUTPUT
LEVEL
switch
to
OdBm
position
(Models 9081 and 9082)
(2)
Connect
the
True
RMS
Millivoltmeter
to
the
50Q
output socket of
the
UUT
using appropriate
cable.
(3)
Tune
the
UUT
to
50
MHz
and
adjust
the
VERNIER
control
for
a
reading
of
OdB
on
the
UUT
meter.
Verify
that
the millivoltmeter
reads
OdBm
±
0.25
dB
(±
0.35
dB
when
the Reverse
Power
Protection
Option
is
fitted)
.
(4)
Tune
the
UUT
slowly over
its
entire
frequency range from
5MHz
to
520MHz
and
verify that
the millivoltmeter reading does not
change
by
more
than
±
0.6dB (±1.1
dB
if
the Reverse
Power
Protection
Option
is
fitted),
and
the
UUT
meter by
more
than
±
0.2dB.
In
the
range
1
.5 to
5MHz
(9082
only) the millivoltmeter reading should not
change
by
more
jthan
±
1
.5dB
and
the
UUT
meter by
more
than
±
0.5dB
.
(5)
Set the
UUT
OUTPUT
switch
to
'X2'
.
(6)
Tune
the
.UUT
to
50MHz
on
the
appropriate range
and
operate
the
VERNIER
control
for
a reading of
+3dB on
the
UUT
meter.
Verify
that the
millivoltmeter
now
reads
9dBm
^O.ddB.
(7)
Repeat operation
(4)
but
keeping
the
OUTPUT
switch
at 'X2' position.
(8)
The
millivoltmeter should
now
read
+9dBm ±0.6dB
and
the
UUT
meter
+3dB±0.5dB
over the frequency range
5MHz
to
520
MHz.
In
the
frequency range
1
.5MHz
to
5MHz
(9082
only) the millivoltmeter
reading should not
change
by
more
than
±
2dB and
the
UUT
meter
by more
than
±
IdB.
(9)
Disconnect
the millivoltmeter.
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