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Powering the Altimeter
The altimeter’s electronics can be powered by any source of 4
volts to 16 volts. All of the electric match firing current must
come from the battery; if your ematch requires 3 amps to fire,
your battery has to be able to supply this much current. Most
commonly-available commercial ematches (e.g. Mtek, Jtek)
require less than one ampere to fire, and a good 9 volt alkaline
battery can supply more than 3 amps of current. Do not exceed
the 5 ampere current limit of the StratoLoggerCF’s firing
circuitry or damage may occur.
Standard 9V batteries can be connected using a battery clip
such as the PerfectFlite CAB9V. Make sure that both of the
clip’s snaps are gripping the battery terminals firmly to
prevent power interruption due to vibration. The larger
battery terminal or clip terminal should be compressed inward
if necessary to ensure a snug fit.
Many other types of batteries (e.g. 12 Volt A23, lithium
batteries, LiPo batteries, etc.) can be used to power the
altimeter, but smaller batteries may have a low maximum
discharge current, which could be insufficient to fire even the
lowest current electric matches. Especially if you use a nonstandard battery or electric match, make sure you ground
test the combination before committing it to flight. It is a
prudent practice to make sure that your chosen battery will
fire twice the number of electric matches that you plan to use
in flight to ensure a margin of safety. If you will be using a
single ematch in flight, make sure your battery will fire two (in
parallel) reliably and consistently during tests. If you will be
using two ematches per output for redundancy in flight, make
sure your battery will fire three or four in testing.
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