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Chapter 6
Clock Startup and Utility Software
6.1
Initial Startup Sequence
Before powering ON the Model 1094B, make sure that the chassis cover is installed and that inlet
power is properly connected to the power inlet connector. The power switch is recessed to prevent
accidental switching of power ON or OFF. When you slide the switch to ON, several things should
happen, as listed in the sequence below:
•
The four annunciator LED’s initially should flash momentarily, then the OPERATE LED
and UNLOCKED LED should light steadily.
•
The LCD should display several introductory messages - see below.
•
The Out-of-Lock Relay (Fault) will be in the out-of-lock (or faulted) position.
•
Eventually, the UNLOCKED LED should extinguish.
•
The Out-of-Lock Relay should change to Locked condition after a few minutes (depends how
long the clock has been powered off).
•
The LCD should indicate that the clock is Locked.
•
The Stabilized LED should light steadily after a few minutes of locked operation.
6.1.1
Clock Time, Startup Mode
When the Model 1094B first starts, it will not indicate the correct time until it is locked to the GPS.
Pressing the TIME key before the UNLOCKED LED is extinguished will produce the message:
TIME NOT AVAILABLE
For IRIG-B time, it will begin counting from zero, with the Julian Day also set to zero. This
method was chosen so that there would be no mistake in interpreting that the clock was in startup
mode. For example, at startup the time could indicate as follows: