Chapter 6
Startup and Operation
6.1
Initial Startup Sequence
Make sure that the chassis cover is installed before powering ON any of these clock models. The
clock will begin a start sequence when you connect power to the clock inlet connector, either Power
A or Power B (if equipped with two power supplies). As soon as power is applied, the clock will
begin the startup sequence and a number of things should occur as listed below:
1. Annunciator LEDs should flash momentarily, then the OPERATE LED, POWER A LED
(and POWER B LED, if installed) and UNLOCKED LED should light steadily.
2. The liquid crystal display (LCD) should display several introductory messages (see below).
3. Initially, the SPDT relay should be in the faulted position.
4. Eventually, the UNLOCKED LED should extinguish.
5. The SPDT relay should change to Locked (non-faulted) position after a few minutes.
6. The LCD should indicate that the clock is locked.
7. After the startup messages, the LCD should indicate TIME NOT AVAILABLE until the
clock is stabilized, then begin displaying the time of day and date.
8. In the 1201B/C, the LEARN LED should light for 24 hours, after which it will extinguish
and the NORMAL LED will illuminate.
6.1.1
Display Indication at Startup
When power is applied, the LCD should indicate as follows:
ARBITER SYSTEMS GNSS
MODEL 1200B CLOCK
or
ARBITER SYSTEMS GNSS
MODEL 1201B/C CLOCK
COPYRIGHT (C) 2020
ARBITER SYSTEMS, INC.
TIME NOT AVAILABLE
