Fluke 6060B - AM Depth and RF Level Adjustments

MAINTENANCE
CALIBRATION ADJUSTMENTS
k.
Repeat the previous four steps
until
the difference between the power
measurements is 20 ±0.1 dBm. This adjustment
should
require three or
fewer iterations.
Program
the
U
UT to +1 2 dBm, using the EDIT keys.
Note
the Power Meter
reading.
l. Program the
UUT
for +2 dBm using the EDIT keys. Verify
that
the Power
Meter reading
is
10
dB
±.2 dB below the previous reading.
m.
Program the UUT
for [SPCL]
[0][0].
This enables amplitude
level
correction and disables amplitude
fixed
range.
n.
Disconnect the Power Sensor from the
UUT,
and replace the Detector
Offset
adjustment access screw.
4. AM Depth
Adjustment
TEST
EQUIPMENT
DVM
Modulation
Analyzer' LFSSG
REMARKS
The UUT must be operated
at room temperature for at least one
hour
with the module
plate
covers in place before
continuing
with this adjustment procedure.
CAUTION
This adjustment
directly affects the output level and
should
not
be
adjusted
Indiscriminately.
This adjustment is
normally
required only when components in the AM signal
processing
circuits have been replaced,
or
the adjustment has been changed or shifted.
If this
adjustment
is made, it is necessary to
perform the RF level adjustment after the AM
depth
adjustment
has been made.
PROCEDURE
Adjust the AM
depth
potentiometer R421 for
90%
AM depth as
measured with the
Modulation Analyzer when the
UUT is
programmed to
90%
AM.
a.
Remove
the AM depth adjustment access screw
from
the bottom module
plate
cover.
b. Connect the
output of the LFSSG to the UUT MOD IN
connector and to
the DVM using a
BNC Tee.
c. Program the UUT
to[RCL][9][8],then program the UUT for 350
MHz, +
1
dBm, and EXT AM at
90%
AM
depth.
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4C-8
d. Program
the LFSSG for 1 kHz and a voltage of 0.7071 rms, as
measured by
the DVM.
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