Operations Manual Perdix
Manual DocRev B
88
BEHAVIOR ON BATTERY CHANGE
Settings
All settings are retained permanently. No loss of settings occurs when changing the
battery.
Clock
The clock (time and date) is saved to permanent memory every 16 seconds when the
Perdix is on, and every 5 minutes when off. When the battery is removed, the clock
stops running. Once the battery is replaced, the clock is restored to the last saved
value (so it is best to remove the battery while the Perdix is on for lowest error).
Quick battery changes will not require any adjustment, but the time should be
corrected if the battery is removed for more than a few minutes.
After replacing the battery a screen appears for quick adjustments to the time
The Perdix uses a highly accurate quartz crystal for time keeping. Expected drift is
about 1 minute per month. If you notice higher drift, it is likely due to clock stoppage
during battery changes, and is easily corrected at the time of a battery change (see
image above).
Decompression tissue loading
The battery may be safely changed between repetitive dives.
Like the clock, the decompression tissue loading is saved every 16 seconds to
permanent memory when on, and every 5 minutes when off.
When the battery is removed the tissues remain stored in the permanent memory
and are restored once the battery is replaced, allowing for battery changes between
repetitive dives. However, the Perdix does not know for how long the battery was
removed, so no surface interval adjustment is applied for the time that the battery is
removed.
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