Output Assembly, A2A4 Adjustment - Fluke 6060B Instruction Manual

MAINTENANCE
CALIBRATION
ADJUSTMENTS
PROCEDURE
Adjust
R16
for
0.98V
at
TPl.
i.
Gain
access to
the rear
of
the
Display
PCA
by removing
the
top instrument
2.
Connect
the
DVM
to
measure
the
dc
voltage
at
TPl
relative to
the
chassis.
3.
Adjust
R
16 for
+0,9800
±
-0005V
dc.
4C-5.
OUTPUT ASSEMBLY,
A2A4,
ADJUSTMENT
This procedure covers
all
of the
adjustments on
the
A2A4
Output
PCA,
as follows:
1.
R309,
LEVEL
D AC
offset
2.
R419, modulation
oscillator level
3.
R
1
44, linearizer detector offset
4.
R421,
AM
depth
5.
R31LRF
level
6.
R227, Het
level
These adjustments, as well as
TP7,
are accessible
by removing
the
seven
number
10
access
screws
in
the
module
cover.
Refer
to
Figure
4C-2
to identify the access
screw
corresponding
to
a
particular
adjustment.
Any
adjustment can be
made
independently unless
it
is
noted that
it
interacts
with
another adjustment. Interdependent adjustments must
be
done
in
the
sequence
presented.
If
more
than
one
adjustment
is
necessary,
do them
in
the sequence
presented.
1.
Level
DAC
Offset
Adjustment
TEST
EQUIPMENT
DVM
REMARKS
This adjustment
is
normally
required only
when U302
or
any
associated
components
are
replaced or
when
the
adjustment has been changed
or has
shifted.
CAUTION
This adjustment
directly affects
the output
level
and
should not be adjusted
Indiscriminately.
PROCEDURE
The
LEVEL
DAC
Offset,
R309,
is
adjusted for
0
±
0.5
mV
at
TP7
with the
RF OUTPUT
turned
OFF.
a.
Gain
access
by removing
the
bottom
instrument cover
and removing
the
access
screws for
TP7 and
R309.
b.
Program
the
UUT
to
[RCL]
[9][8],
and program
the
RF OUTPUT
to
OFF.
c.
Connect
the
DVM
to
measure
the voltage
between
TP7
and
the
power
distribution
connection point
on
the
module
plate.
4C-4