Fluke 6060B - Page 147

maintenance
CALIBRATION
ADJUSTMENTS
PROCEDURE
The
UUT
PLL loop
is disabled
to cause the
VCO
frequency
to be at
the
upper limit
of its
range,
then
R104 is
adjusted for 530
MHz.
a.
Remove
the
instrument
and module
plate top
covers.
b.
Connect
UUT RF
OUTPUT to
the Frequency
Counter
input.
c.
Program
the
UUT to
[RCL]
[9][8];
then,
program
the UUT
for
500
MHz
and
+13 dBm.
d.
Using a clip
lead, short
TP14 to ground
to cause the
VCO to go
to the
upper
frequency
limit.
e.
Adjust
R104 for 530
MHz ± 1
MHz.
5.
800-MHz Oscillator
Adjustment, C206
TEST
EQUIPMENT
Frequency
Counter
DMM
REMARKS
This
adjustment
is
normally
not
required
unless
components in
the
800-MHz
oscillator
are
replaced or
the
Generator
has been
subjected to
severe
usage.
PROCEDURE
The PLL
control
voltage
operating
point is
adjusted
to 16V
while the
loop
is
phase-
locked.
a.
Remove
the
instrument
and the
module plate top
covers.
b.
Program the
UUT to [RCL]
[9][8];
then,
program 200
MHz.
c.
Connect the
DMM
to
measure
voltage
between
TP53 and
the
chassis.
d. Adjust
C206 for
16.0V ± 0.5V.
6. 10 MHz
Lock-Range
Centering
Adjustment
TEST
EQUIPMENT
Frequency
Standard
Low
Frequency
Synthesized Signal
Generator
(LFSSG)
Oscilloscope
BNC
Tee
REMARKS
The
UUT
reference
output
and the
LFSSG
signal
are viewed
simultaneously
on the
oscilloscope
for
frequencies
near
the limit
of
the lock-in
range. The
10-MHz
crystal
4C-15