Fluke 6060B - Output Assembly Adjustments

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 DAC
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