C.3 Option 02: GPS Battery Backup - Obsolete 99
C.3 Option 02: GPS Battery Backup - Obsolete
NOTE: This option has become obsolete because the new GPS receivers incorporate a lithium
dioxide data backup battery. See the Model 1092/1093 Operation Manual for further information.
C.3.1 General Description
Option 02 incorporates a nickel-cadmium battery to back up memory circuits, which store data
pertaining to GPS system parameters. Circuitry within the clock maintains the charge level of the
battery during normal operation, and the battery preserves the data during power outages or when
the clock is turned off.
The GPS backup battery supports the following functions and parameters:
Function: Ephemeris Data.
Description: Information pertaining to satellite position or projected position, as a function of time.
Storing the above information will reduce the time needed to re-acquire satellite lock when the
unit is turned on, or upon restoration of power after an outage.
NOTES:
1. There is no relationship between the GPS backup battery and the RAM backup battery
included in a standard Model 1088A/B clock. The purpose of the standard RAM backup
battery is to preserve the configuration settings for the instrument.
2. The standard Models 1083A, 1084A/B/C and 1093A/B/C clocks do not contain a RAM
backup battery because an EEPROM has replaced the RAM.
C.3.2 Specifications
Nickel-Cadmium, 3.6 volts, 60 mAh, Memory Retention Time: 2 months (approximate)
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