Voltage Adjustment; Frequency Adjustment - Fluke 6060B Instruction Manual

OPTION
-130
HIGH
STABILITY
REFERENCE
The Ovcncd
Oscillator
output
is
disabled
when
the control
line
EXREFL
is
set
low,
i.e.,
when
the
REF
INT
/
EXT
switch
is
set
to
EXT
during external reference operation.
The
status line
HSOPTL,
normally
at
+5V,
is
pulled
to
ground
when
the High-Stability
Reference option
Is
installed.
130»4.
ADJUSTMENTS
TEST
EQUIPMENT
Frequency Standard
Oscilloscope
Two
3-ft.
50-Ohm
coaxial cables,
Y9II1
REMARKS
The
voltage adjustment
(A3A2Al'R4)
should be
made
after
the
first
half
hour
of
the
three-hour
Generator
warmup
period has begun. For
the best results in the
frequency
accuracy adjustment,
the
Generator should be operated
at
room
temperature
for
at least
three
hours before continuing with the
adjustment
procedures.
PROCEDURE
The
High-Stability Reference
Power
supply voltage
is first
adjusted.
Then
the
UUT
reference
and
the
Frequency Standard waveforms
are viewed
on the oscilloscope while
triggering
on
the
Frequency
Standard.
The evened
oscillator
FREQ
ADJ,
COARSE,
and then
FINE
are adjusted for a stationary display.
Voltage
Adjustment
1.
Remove
the Generator top
cover.
2.
Connect
the
DMM
to
the
UUT. Connect
the positive lead to
TPl
and
the
negative lead to
TP3.
3.
Adjust
R4
for 23.4
±
0.1
V.
4.
Remove
the
DMM
connections
from
the
UUT
and
replace the
top cover
(temporarily).
Wait
the
remaining Generator
warmup
time,
and perform
the
frequency accuracy adjustment.
Frequency Adjustment
1.
Remove
the
top Generator cover
and
the
two
FREQ ADJ
access .screws
from
the
top of the
evened
oscillator.
2.
Connect
the
Frequency Standard signal to the oscilloscope vertical input
channel 1,50
Ohms
termination.
Connect
the
UUT
rear panel
10
MHz OUT
to
the oscilloscope vertical
input channel
2,
50
Ohms
termination.
3.
Set the
UUT
rear
panel
UUT REF
INT/EXT
switch
to
INT,
4.
Set the
vertical
controls of the oscilloscope
to
display the
UUT
lO-MHz
signal
and
the
Frequency Standard
10-MHz
signal.
Set for internal triggering
on
channel
1,
and
adjust
timebase
for O.l/xsec/div.
130-2