Shearwater Petrel 3, Руководство по эксплуатации

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Page 66
Doc. 13300-REC-RevB (2022-05-02)
Recreational Modes
Operating Instructions
13.1. 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 dive computer 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 dive
computer 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
Expected clock drift is
about 4 minutes per
month� If there is higher
drift, it is likely due to
clock stoppage during
battery changes, and is
easily corrected at the
time of a battery change�
The clock is also updated
every time the dive
computer is connected
to Shearwater Desktop or
Shearwater Mobile�
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 dive
computer 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�
For quick battery changes, the un-powered time
interval is not significant� However, if the battery is
removed shortly after a dive and then remains out for
a long period, residual tissue loading will remain when
the battery is replaced�
If at the time of battery replacement any tissue is
below saturated with air at the current pressure, then
that tissue is brought up to being saturated with air�
This might happen after a decompression dive that
used 100% O2, where the faster tissues are often
completely depleted of inert gas loading� Bringing
such tissues back up to saturated with air after a
battery change is the most conservative approach�
When deco tissues are reset:
• Inert gas tissue loadings are set to saturated with
air at current atmospheric pressure
• CNS Oxygen Toxicity set to 0%
• Surface Interval time set to 0
• All VPM-B values set to default levels