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Wavetek 3000 - Internal Modulation Frequency Test

Wavetek 3000
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PERFORMANCE
TESTS
SPECIFICATION
METHOD
Amplitude
&
Fre-
quency
Modulation
4
.10
INTERNAL
MODULATION
FREQUENCY
TEST
2
.
Connect
the
Signal
Generator
RF
out
connector
to
the
50
ohmRF
input
of
the
modulation
meter
.
3
.
Set the
modulation
meter
to
read
FM
deviation
at
520
MHz
.
Set the
meter
range
switch
to
3,
the
RF
input
attenuation
to 20
dB,
the
IF
bandwidth
to
t400
kHz,
themeterresponse
to
fast
and
the
filter
bandwidth
to 50
Hz-15
kHz
.
4
.
Measure
the
average
level
of
the
FM
deviation
on
the
modulationmeter
and
disregard
occasional
peaks
.
The
resi-
dual
FM
should
be
<200
Hz
.
Read
the
residual
FM
on
the
panel
meterwith
the
function
switch
set
to
+FM
and
then
-FM
posi
tions
.
Record
the
greater
of
the two
readings
in
Hz
on
line
26 of
the PTR
.
As
many
other
frequencies
maybe
tested
as
desired
.
Internal
400
Hz
and
1
kHz+5I
A
frequency
counter
is
used
to
measuremodulation
frequency
at
the
rear-panel
modulation
test
pointof
the
SignalGener-
ator
.
Since
the
internal
400
Hz
and
1
kHz
oscillators
are
used
for
both
the
AM
and
FM
modes,
this test
will
suffice
for
both
modes
.
EQUIPMENT
Frequency
Counter
HP5300B/5303B
PROCEDURE
1
.
Set
the
Signal
Generator
controls
as
follows
FREQUENCY
selector
N/A
(not
applicable
to
this
test)
MODULATION
MODE
N/A
MODULATIONFREQ
400
Hz
MODULATION
FM/AM
Mid-range
OUTPUT
VERNIER
N/A
OUTPUT
step
attenuator
N/A
2
.
Connect
the
lowfrequency
input
of
the
frequency
counter
to
the
rear-panel
MODULATION
T
.P
.
of
the
Signal
Generator
.
NOTE
:
Provide
a
ground
connection
between
the
Signal
Gen-
erator
and the
counter
.
3
.
The
counter
should
readbetween
380
and
420
Hz
.
Record
the
counter
reading
on
line
27
of
the
PTR
.

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