Operations Manual Perdix
Manual DocRev B
72
Depth Units Feet
Temp Units
°C
Brightness Med
Altitude Auto
Flip Screen
Depth Units Feet
Depth Temp
°C
Brightness Med
Altitude SeaLvl
Flip Screen
Altitude
The altitude setting when set to ‘Auto’ will compensate for pressure
changes when diving at altitude. If all your diving is at sea level,
then setting this to ‘SeaLvl’ will assume that surface pressure is
always 1013 mBar (1 atmosphere).
If the Perdix measures the surface pressure to be less than 965
mbar, then the Altitude setting will be forced to "Auto" and cannot
be changed.
Accurate depth measurements and decompression
calculations require knowing the ambient
atmospheric pressure at the surface. Regardless
of the turn on method, the surface pressure is
determined the same way. While in the off state
the surface pressure is measured and saved every
15 seconds. A 10 minute history of these pressure
samples is kept. Immediately after turn-on this
history is examined and the minimum pressure is
used as the surface pressure. The surface pressure
is then remembered, and not updated again until
the next turn-on.
DETERMINATION OF
SURFACE PRESSURE
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