Fluke 6060B - Incidental FM, Residual AM, and FM Accuracy Tests

MAINTENANCE
PERFORMANCE TESTS
c.
Program
the LFSSG for 1 kHz at
0.7071V
rms
as
measured by the
DVM.
d.
Connect the
modulation
output of the Modulation Analyzer to
the
input of
the
Distortion Analyzer.
e. Set the
Distortion Analyzer to measure the THD of
the 1-kHz modulation
signal.
f.
Verify that the mean AM
depth
(+PEAK. plus -PEAK)/2, is between 26.8%
and 33.2%.
g.
Verify that the THD
is less
than 1.5%.
h. Program the
remaining
combinations of RF frequency,
'level, and AM
depth listed in Table 4A-3.
For each combination, verify that the
mean AM
depth is
between the allowed
limits
and that the THD is less than the
allowed
limit,
which depends on
programmed
depth, as shown in Table 4A-4:
i. Disconnect the
LFSSG from
the
UUT.
4.
Incidental
FM
Test
a. Program the
UUT
for
30%
INT AM at 1 kHz, at 1050
MHz, and 10 dBm.
b.
Program the
Modulation
Analyzer to measure peak FM
deviation
in a
0.3-
to 3-kHz bandwidth.
c.
Verify
the incidental FM is
less
than
300
Hz.
NOTE
It may be
necessary to compensate
for
residual noise
effects
using
the
procedure
presented in the
Modulation
Analyzer manual.
5.
Residual AM Test
a.
Program the UUT to 100
MHz, +7 dBm, and no
modulation.
b.
Program the
Modulation
Analyzer to measure rms (or
average)
AM in a
0.05-kHz to 15-kHz bandwidth.
c. Verify the
residual
AM is less than
0.1%
rms (or 0.09%
average).
6.
FM Accuracy and
Distortion
Test
a.
Connect the output of the LFSSG to
the
U
UT
MOD INPUT
connector
and
the
DVM (use a BNC T connector).
b.
Program the Modulation Analyzer to measure peak FM in a
0.05-kHz to
20-kHz
bandwidth,
c.
Program
the UUT frequency to 245
MHz,
7
dBm, 99.9 kHz
(9.99
kHz
if the
Generator
has Option
-651)
deviation, and
EXT FM.
d. Set
the
LFSSG to 10 kHz and adjust its
level
so
the DVM reads
707.
1 mV
rms.
i
4A-14