Quote:
Originally Posted by st1000
Is there a specified period?
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Hi Steve,
Thanks for the post and welcome to IceInSpace.
The job of the lithium coin cell is to provide power to the time of day clock in
the absence of any other power source. In other words, when the power switch is
in the OFF position, the coin cell will still provide power to the time of day clock.
Should it deplete, Argo Navis will display a RTC BATTERY FLAT message at
power on and will then display that it is resetting the time back to JAN 1 2000 12:00.
If this should ever occur whilst in the field, simply go to SETUP DATE/TIME and
manually update the DATE and TIME settings.
We recommend to keep the coin cell in place until it depletes.
The time of day clock consumes minuscule amounts of power, in the order of
nanoamps, and the coin cell can typically provide sufficient back-up power to
last five or seven years.
Appendix F of the Argo Navis User's Manual details how to replace the coin cell
when the time comes. The coin cell is a Panasonic CR-1220 or equivalent.
We stock replacements.
Generally speaking, for star alignments, Argo Navis doesn't need the date/time or
location. It uses the date/time for calculating the positions of solar system objects and
for making corrections for precession, nutation and refraction.
Best Regards
Gary Kopff
Managing Director
Wildcard Innovations Pty. Ltd.
20 Kilmory Place, Mount Kuring-Gai
NSW. 2080. Australia
Phone +61-2-9457-9049
Fax +61-2-9457-9593
sales@wildcard-innovations.com.au
http://www.wildcard-innovations.com.au