68
Front Panel Menu System
8.4
Setting Out of Lock Indication
Use the “SET OUT OF LOCK?” menu to control how the clock responds to an out-of-lock con-
dition. Out of lock means that the GNSS receiver in the clock is no longer tracking any satellites
and that the time may drift according to characteristics of the internal holdover oscillator and
environmental conditions. Adjust these settings so that, in the event of an out-of-lock condition,
you will be notified in a reasonable amount of time. The default setting is for the clock to alarm
after being unlocked for a period of one minute. Unlocked indications include an illuminated red
unlocked LED, and the SPDT relay switching to the unlocked, or faulted, condition.
The relay may also be configured to respond to several other clock conditions, which are dis-
cussed in Section 8.5.
For RS-232 command, see Section 11.2.12
SET OUT-OF-LOCK?
ENTER
SETUP
OUT-OF-LOCK TIME
01 Min
ENTER
99 MIN
|
01 MIN*
ZERO DELAY
OFF
* = Default setting
DOWN
UP
Figure 8.5: Out-of-Lock Setup
Out of Lock Status Indicator
The out of lock function will indicate the number of days, hours and minutes since the time the
clock lost lock with the GNSS. The counter stops at 45 days and the clock LCD indicates as follows:
UNLOCKED
45d --h --m
After the clock regains synchronization with the GNSS, the unlocked counter resets to zero and the
UNLOCKED message disappears.
Summary of Contents for 1201B
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Page 153: ...B 7 Four Fiber Optic Outputs 135 Figure B 4 Jumper Locations ...
