Power Up Sequence - Novatech Kronos 2 Series User Manual

Kronos Series 3
3.2

Power Up Sequence

The power up sequence is shown in Figure 8.
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.
At the end of the firmware load, the IP address assigned to Ethernet port A will be briefly shown on the dot
matrix display, but only if a network cable is plugged in.
The clock will now start tracking satellites. During this phase, the number of satellites being tracked is
shown on the dot matrix display. At least four satellites are needed to obtain the initial fix. Additionally
almanach and ephemeris data must be downloaded from the satellites and the UTC offset must be
determined.
Ephemeris data has to be downloaded from each satellite which requires several minutes of strong signal
from the tracked satellites.
The UTC offset is broadcast only once every 12 minutes, so that additionally up to 12 minutes may pass
before the first lock is achieved. This takes longer if the sky view is partially obstructed.
Once all needed information is obtained and the internal oscillator is adjusted in phase and frequency, the
clock will enter the Locked state. Only now will the clock start to display the local time on the dot matrix
display and distribute time over the outputs, as configured.
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