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Multideco-DR5 user manual
7
Introduction
This manual describes the Multideco-DR5 firmware for the HeinrichsWeikamp DR5 dive
decompression computer. The DR5 comes with its own hardware user manual that
describes various functions. Review the DR5 manual for descriptions of charging, the
USB attachment fitting, warranty, etc.
Description
The HeinrichsWeikamp DR5 dive computer has the powerful Atmel AVR32 processor.
The DR5 can be re-programmed with any dive decompression program by the user and it
has a bright color OLED display that is easily viewed in the water. The DR5 includes a
Fisher cable connection and is ready for use on CCR’s. The DR5 uses three button for
controlling the computer and to navigate the menus and settings.
Multideco-DR5 uses genuine VPM-B and VPM-B/E, along with Gradient Factor (GF)
for its decompression calculations in a complete submersible dive decompression
firmware program. This program has been designed to perform continuously updating
decompression calculations for the underwater environment. Multideco-DR5 tracks the
diver’s progress and conditions and tissue state, and is computing a new set of ascent
limits continuously. At first the NDL limits are displayed and progressing into
decompression stops and time limits. The diver is able to select a decompression model
to suit the conditions or preferences.
The VPM (Varying Permeability Model) has its origins in research into micro bubbles
that began in the mid 70’s. More details on the VPM model history and revisions,
technical references and links to its theory and methods of calculations are available here:
http://www.hhssoftware.com/v-planner/vpmdetail.html
Multideco-DR5 includes the VPM-B/FBO model version for use by CCR divers during
bail out situations. Fast Bail Out (FBO) can reduce the required bailout mix volume
requirements.
The Gradient Factor (GF) method was created by Eric Baker in the late 90’s, and applies
a conservatism layer onto the Bühlmann ZHL-16 calculations.
The Gradient Factor Surface (GFS) method is a combined plan. This takes a regular
VPM-B plan and a ZHL-16C with a GF Hi setting only, and uses the deeper or longer
parts of the ascent segments from each plan.
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