Fluke 6060B Instruction Manual page 125

MAINTENANCE
PERFORMANCE TESTS
The
UUT
settings in
this
procedure
are chosen
to
provide a strong confidence of
the
modulation performance
of the
UUT
throughout
its
range.
However, performance
also
may
be checked
at
other instrument
settings
if
desired.
The
FM
deviation accuracy depends upon
software correction data stored
in
the
VCO
Calibration
EPROM
that
is
derived
from
the
measured
data of the particular
VCO
assembly
installed in the
Generator.
TEST
EQUIPMENT
Modulation Analyzer
Distortion Analyzer
Frequency Counter
Low-Frequency
Synthesized Signal
Generator (LFSSG)
DVM
PROCEDURE
1.
Internal
Modulation
Oscillator Frequency
Test
a.
Connect the
UUT RF OUTPUT
to the
Modulation Analyzer
input,
b.
Connect
the
Modulation Analyzer modulation
output
to the
Frequency
Counter
input.
c.
Program
the
Modulation
Analyzer
to
measure
AM
depth
in
a 0.05-kHz
to
15-kHz bandwidth.
d.
Program
the
UUT
to
[RCL]
[9][8].
Program
the
UUT
for
90% INT
AM
at
a
1-kHz
rate
and
a
level
of
+1 dBm.
e.
Verify that the
Counter
reads
between 970 and 1030 kHz.
f.
Program
that the
UUT
to
a modulation
frequency of 400 Hz.
g.
Verify the Counter
reads
between 388
Hz
and 412
Hz.
2.
Internal
AM
Accuracy Test
a.
Measure
the
mean
AM
depth,
(+PEAK
plus
-PEAK)/2,
with the
Modulation
Analyzer.
b.
Verify
that the
mean
AM
depth
is
between 84.4% and
95.6%.
c.
Program
the
UUT
to
a modulation
frequency of
1
kHz.
d. Verify that the
mean
AM
depth
is
between 84.4% and
95.6%.
3.
AM
Accuracy and
Distortion Test
a.
Connect
the output of
the
LFSSG
to the
UUT
MOD
INPUT
and
the
DVM
(use a
BNC T
connector).
b.
Program
the
U
UT
for
a frequency of
0.4
M
Hz,
1
d
Bm
level,
and
EXT A
M
at
30%
AM
depth.
4A-13