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Wavetek 3000 - FM Deviation Accuracy Test

Wavetek 3000
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PERFORMANCE
TESTS
METHOD
4
.14
FM
DEVIATION
ACCURACYTEST
SPECIFICATION
the
meterresponse
to
fast,
the
function
switch
to
+AM,
the
meter
range switch
to
100
and the filter
bandwidth
to 50 Hz
to 15
kHz
.
4
.
Adjust
the
Signal
Generator
MODULATION
FM/AM
control
for
a
modulation
meterreading
of
70%
AM
.
Set
the
modulation
meter
function
switch
to -AM,
and
observe
the
modulation
meter
reading
.
Readjust
the
MODULATION
FM/AM
control
until
the
average
of
the two
modulation
meter
readings
in
+AM
and
-AM
positions
of
the
modulation
meter
function
switch
is
equal
to
70%
AM
.
5
.
Calibrate
the
distortion
analyzer
and
measure
the
dis-
tortion
.
The
distortion
should
be
less
than
3%
.
Record
the
distortionon
line
34 of
the
PTR
.
6
.
Adjust
the
Signal
Generator
MODULATION
FM/AM
control
as
in
step
4
until
the
average
of
the
modulation
meter
readings
in
+AM
and
-AMpositions
of
the
modulation
function
switch
is
equal
to
90%
AM
.
7
.
Calibrate
the
distortion
analyzer
and
measure
the
dis-
tortion
.
The
distortion
should
be less
than
5%
.
Record
the
distortion
on
line
35
of
the
PTR
.
DeviationAccuracy
±250
Hz on
FMx1
range
±35 kHz
on
FMx100
range
The deviation
is
measured
in
both
FM
modes
using
an
internal
DC voltage
equal
to
the
peak
of
the
internal
sine
wave
voltages
.
A
frequencycounter
is
used
to
measure
the
maxi-
mum
deviation
in
both
FM
modes
.
EQUIPMENT
Frequency
Counter
HP5300B/5303B
PROCEDURE
1
.
Set
the
Signal
Generator
controls
as
follows
:
FREQUENCYselector
050
.000
MHz
MODULATION
MODE
FMx1
MODULATION
FREQ
VERNIER
MODULATION
FM/AM
5
kHz
on FM
scale
OUTPUT
VERNIER
FullyClockwise
OUTPUT
step
attenuator
+10 dBm
2
.
Connect
the
50
ohm
input
of
the
frequencycounter
to
the
Signal
Generator
RF
out
connector
.

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