LX Zeus
February 5, 2013
- 21 -
The
TEF
(TE filter) is the compensation delay. Larger numbers will increase the delay and vice versa.
During the first test is recommended to use TEF 4.
Electronic TE is only effective when the pitot and static sources are co-located and the pneumatic lines to
the instrument are approximately the same length. The best sensor to use is the combined pitot/static
Prandtl tube. If problems are experienced with the electronic TE compensation, then the most likely cause
is the glider's static source. The static source can be checked by plumbing the pneumatic tubes for
electronic compensation and then setting the
TE:
to 0%. In still air, accelerate to approximately 160 km/h
(75 Knots) and reduce the speed. Observe the vario indicator. If the static source is good, then the vario
should immediately start to move to show a climb. If the needle initially shows increased sink and then
moves to a climb, the static source of the glider is unsuitable and there is no way to provide successful TE
compensation electronically. The use of a dedicated and accurate fin mounted pitot/static source such as
a Prandtl tube might help.
There are two ways by which the vario units can be corrected for total energy; electronic TE
compensation based on speed changes with time; and pneumatic compensation with a TE probe. When
using pneumatic compensation by use of a TE probe. The quality of the TE compensation depends
entirely on the location, size and dimension of the TE tube. The installation must be leak-proof.
Note!
If electronic TE compensation is selected, then the TE(Pst) port should be connected to a good static
pressure source. If pneumatic compensation is selected, then the TE(Pst) port should be connected to
the TE probe.
Compensation with TE probe Electronic compensation
TE(Pst)
port
on vario
