Arbiter Systems 1084A, Operation Manuals

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Chapter 10
Startup and Basic Operation
10.1 Initial Startup Sequence
Before powering ON any of these clock models, make sure that the chassis cover is installed and if
equipped with a power switch, that inlet power is properly connected to the power inlet connector.
If the clock does not have a power switch, then the clock will begin the Startup Sequence when
inlet power is connected to the rear panel. When the clock starts, several things should things
should happen
1
in the sequence listed below:
•
The four annunciator LED’s initially should flash momentarily, then the operate, on line and
unlocked LED should light steadily.
•
The LCD should display several introductory messages - see below (for 1084B/C clocks only).
•
The out-of-lock relay will be in the faulted position and the fault relay should switch to the
unfaulted position.
•
Eventually, the unlocked LED should extinguish.
•
The out-of-lock relay should change to non-faulted position after a few minutes.
•
The LCD should indicate that the clock is locked (for 1084B/C clocks).
10.1.1 Clock Time, Startup Mode – 1084B/C
When the clock 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, the time could indicate as follows:
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Startup behavior is based on Models 1084B/C clocks with a display. Startup behavior for the 1084A have no
visible display other than four annunciator LEDs. For the 1084A, time and position (and other) data may be viewed
if monitoring through a RS-232 port.