LED goes
off
ALIGN DISCIPLINED RUBIDIUM OSCILLATOR FREQUENCY
USING EXTERNAL REFERENCE
On OMAU,
CHAIN
moving
Yes
No
[25] Is
channel 2
AND
0
1
2
3
LOCATION
070-24
070-47
170-24
170-47
FA626
TABLE D
CLOCK
waveform
VERIFY
[24] Set oscillator manual adjustment
unit thumbwheel to 2000 and enter
by depressing
LOAD
pushbutton
(CHANNEL 1)
(CHANNEL 2)
SIGNAL
TERM 210
OF FA626
[23] Connect oscillator manual adjustment
[20] See NOTE 4. Connect channel 2 scope
[22] See NOTE 5. Set horizontal controls for
[21] At scope, set CRT display
probe to 8-kHz framing pulse at terminal
210 of
FA626
pack [TABLE D]
to
CHOP
mode
µ
NCSU REFERENCE
[26] Repeat from
thumbwheel settings
to cause waveform
to stop moving
4. The external
reference signal
is expected to
have some amount
of jitter which
will cause the
pulse to appear
to have jitter
5. It will be
necessary to use
channel B delayed
feature on scope
framing pulse may
appear anywhere
with respect to
the synced edge
of the reference
signal
8-kHz framing
because 8-kHz
Step 24, changing
NOTES
Figure 1
.1 s/div [Figure 1]
DLP
PAGE 3 of 5
234-151-013
Issue 8
DEC 1995
544
