LOCKED
HOLD OVER
ALARM
SERVICE
t
ī
ma 2P
GPS MASTER CLOCK
10
124
During normal operation the display will show date, time and/or time zone
Normal operation:
information. Several formats are available, see section
on page
for de-
tails.
LOCKED
HOLD OVER
ALARM
SERVICE
10033
t
ī
ma 2P
GPS MASTER CLOCK
10033
If an alarm is detected (e.g. antenna cable open), the display will show the
Alarm:
corresponding alarm message.
LOCKED
HOLD OVER
ALARM
SERVICE
t
ī
ma 2P
GPS MASTER CLOCK
10
132
3.1.2 Locked indicator
Unit is searching for satellites for the first GPS fix. Dot matrix display shows
Blinking green:
number of satellites currently tracked.
Time reported by the unit is locked to atomic clocks on board the GPS satel-
Solid green:
lites. Dot matrix display shows local time, date and/or time zone, as config-
ured.
3.1.3 Holdover indicator
Time reported by the unit is derived from the internally temperature compen-
Solid yellow:
sated crystal oscillator. Error estimates are continuously compared to the user
defined thresholds.
If the first error threshold is exceeded, the unit will generate a LOW QUALITY
alarm but will continue to report and show time.
If the second error threshold is exceeded, the unit will generate a BAD TIME
alarm and stop showing and reporting time.
3.1.4 Alarm indicator
A level 2 alarm has been raised in the equipment and requires operator atten-
Solid red:
tion. The dot matrix display will report the alarm cause.
3.2 Power Up Sequence
tīma’s power up sequence is shown in figure
After power is applied to the unit, a brief short test is performed whereby the
Alarm indicator lights up for less than a second. Then the firmware version is
briefly shown on the dot matrix display, while the Holdover indicator is lit.
After that, the firmware will be loaded. This takes around 30 seconds. During
this time a progress bar and a percentage indicator will be shown on the dot
matrix display.
12
tīma 2P/2R GPS Master Clocks Reference Manual
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