I always test new
altimeters before first flight. Normally I test the whole assembly
with the altimeters, batteries and switches all mounted and wired
together. However, in this case the assembly was too large to fit
into my vacuum jar. Therefore, I tested the MissileWorks altimeters
individually before mounting and wiring them in place.
This is another advantage
of the MissileWorks altimeters in that I can test them in a vacuum jar
prior to flight. The ARTS altimeter uses both a pressure sensor and
an accelerometer so I don't have a good way to test it other than to fly
As part of my testing I use
a reference altimeter dial that I purchased at a local sporting goods
store. This is a handy little item. It can be placed into the
vacuum jar along with the electronic altimeter being tested and shows what
altitude the electronic altimeter should report. They don't
necessarily match exactly, but they should be pretty close.