Model 5601MSC
Model 5601MSC Master SPG/Master Clock System
Page - 96 Revision 2.2 MASTER CLOCK
4.3.12. Synchronizing the System Oscillator or System Time to the Reference Immediately
This menu item allows the user to initiate an immediate forced
synchronization of the master system oscillator to its frequency reference,
or the system time to its time reference.
CAUTION: These controls perform an immediate action once the SELECT
button is pressed. The text “Live control” will be shown on the left LCD
with a red background as a warning.
Jamming the Frequency Reference:
This action will
only be required when the frequency lock type has been
set to Slow. In Slow
mode, the 5601MSC can only gradually adjust its
internal oscillator if it becomes unsynchronized to the frequency reference
(see section
4.3.3 for more information on Slow mode). This can occur if
the frequency reference is disconnected for a period of time. The internal
oscillator will drift slightly and upon reconnection a
exist between the two.
The slow lock process can take a long time. To resolve this discrepancy
immediately, the user can initiate a manual jam of the frequency
reference. The word Jam here is used in the context that the timing and
phase measured on the reference will be jammed into the system
oscillator forcing it into synchronization. This can cause glitches on all
outputs of the 5601MSC and should be used with caution.
To perform a jam of the frequency reference, select the Jam Reference
menu item and press the SELECT button.
Jamming the Time Reference:
Performing a manual jam of the time reference will only be required when
the time lock type is set to User or Never. In User mode the 5601MSC will
warn whenever system time does not agree with the time reference (see
section 4.3.12
). When the lock type is Never, the 5601MSC will ignore the
time reference completely and not generate any warnings. Performing a
manual jam with this menu item is the only way to synchronize the system
clock to the time reference. The word Jam is used in the context that the
time and
date provided by the time reference will be jammed into the
system time clock to synchronize them.
Note that if
the time reference is set to SNTP then this forces an
immediate SNTP synchronization.
To perform a jam of reference time/date into system time, select the Jam
Time menu item and press the SELECT button.
When performing a frequency or time reference jam, allow 10 seconds for any
jam warning messages to clear.
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