Arbiter Systems 1088A, Operation Manual

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6 Front and Rear Panels
2.2.1 Annunciator LED Definitions
Annunciator LED Color Purpose
Operate Green Clock Operating
Charge* Green Illuminates when the charging circuit for
the internal battery is in the high charge
mode.
In Use* Green Illuminates when the power is supplied by
backup battery.
Lo Battery* Red Illuminates when the battery voltage falls
below 5.6 volts.
On Line Green Indicates Active Clock**
Unlocked Red Out-of-Lock when ON
Fault Red Internal/External Faults***
Table 2.1: Annunciator LED Definitions
* Only active with clock power backup battery. Refer to the option information sheet for details
about the internal battery operation.
** When used with Option 18, Redundant Interface, the On Line LED indicates which of the two
interconnected clocks is active.
*** Illuminates when a fault condition exists with the clock or GPS receiver. See Section 10.3.
2.2.2 LED Status Indicators
Four LED’s provide information about the operational status of the instrument. The Operate and
On Line LEDs are green and the Out-of-Lock and Fault LEDs are red. For normal operation, with
the clock locked and accurate, the two green LEDs should be ON and the two red LEDs should be
OFF.
Three LED’s provide information about the clock power backup battery. The Charge and In Use
LEDs are green and the Lo Battery LED is red.
The following definitions apply to these indicators:
•
OPERATE : Indicates that power is being supplied to the clock.
•
CHARGE : Indicates that the charging circuit for the internal battery is in the high charge
mode. Whenever power is present at the rear-panel power inlet, the charging circuit will
provide a trickle charge. If the battery charge level falls below a preset threshold, the high
charge mode will be activated.
•
IN USE : Indicates that the internal battery is supplying power to the clock.
•
LO BATTERY : Indicates the backup battery voltage falls below 5.6 volts.