Fluke 6060B Instruction Manual page 140

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.
I
I
I
w
4C-8
d.
Program
the
LFSSG
for
1
kHz
and
a voltage of 0.7071 rms,
as
measured by
the
DVM.
I