90 Startup and Basic Operation
Deviation Display
1 PPS: 0.00 µS
SIGMA: 0.00 µS
10.2.5 IRIG-B Time Data
IRIG-B time is immediately sent out, when the clock is powered ON, from any timing output
port configured for IRIG-B as indicated above. Time will not be accurate until the Unlocked LED
extinguishes.
10.3 Clock Status Display Mode
When first applying power to the clock, the display will indicate several startup messages, then
will revert to Clock Status mode condition called STARTUP. After a short time, while the GPS
receiver begins collecting data from the GPS, it will indicate either UNLOCKED (XX Min), NOT
STABILIZED, LOCKED–AUTO SURVEY, or LOCKED–POSITION HOLD. If they exist, faults
are indicated as follows:
Bit Weight Function
0 1 OCXO Not Installed (set to 1)
1 2 Stabilized (stabilized = 1)
2 4 Power Supply Error
3 8 IRIG BUS Fault (was Opt. 18)
4 16 Out of Lock
5 32 Time Error
6 64 VCXO Error
7 128 Receiver Failure
Table 10.1: Fault Conditions
For additional information on internal faults, please see Section 2.3.5, Section 8.1.3 and the
System Status command including Table 9.3 starting on page 73.
10.4 Time Display Modes – 1084B/C
After establishing GPS satellite synchronization, date and time information can be displayed on
the front panel by pressing the TIME key and scrolling through the four available displays. Press
this key to select the time display mode (UTC or Local) time data (Date/Time or Day of Year).
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