Bedienungsanleitung LX NAV LX9070 (Seite 65 von 151) (Englisch)

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LX90xx system Version 4.0 February 2014

Page 65 of 151

If the digital TE option has been used TE compensation should be set to 100%.

It is important to note that the method of TE compensation is set up when the

instrument is installed by virtue of the pneumatic connections made to the TE and

static ports. Changing the compensation type in the setup screen below WILL

NOT change the method of compensation - the pneumatic plumbing has to be

changed first.

If the TE tube has been connected TE compensation should be set to 0%. The

quality of the TE compensation depends entirely on the location, size and

dimension of the TE tube. The installation must be leak-proof.

The digital TE compensation can be fine-tuned during flight using the following procedure.

It is essential that this is only done in smooth air; it is not possible to tune the TE accurately

in turbulent air.

Set TE compensation to 100%. Accelerate up to approximately 160 km/h (75 kts) and keep

the speed stable for a few seconds. Gently reduce the speed to 80 km/h (45 kts). Observe

the vario indicator during the manoeuvre. At 160 km/h the vario will indicate about –2 m/s

(-4 kts). During the speed reduction the vario should move towards zero and should never

exceed zero (slightly positive indications are acceptable). If the vario shows a climb the

compensation is too low; increase the TE%; and vice versa. Try another “zoom” to assess

the change and make further adjustments if necessary.

Digital TE compensation is only effective when the Pitot tube 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 digital TE compensation the most likely cause is the glider's static source. The

static source can be checked by plumbing the pneumatic tubes for digital TE compensation

and then setting the TE: to 0%. In still air accelerate to approximately 160 km/h and slowly

reduce the speed. Observe the vario indicator. If the static source is good the vario should

immediately start to move to show a climb. If the needle firstly 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 digital TE compensation. The use of a dedicated and accurate fin-

mounted Pitot/static source such as a Prandtl tube might help.

6.1.12.1.2 SC Switch

The vario unit has an input for an external speed command switch which is wired to the

vario unit cable set. Using the external switch it is possible to switch between SC and Vario

manually. Setting the SC switch to ON means that closing the switch will cause the

instrument to enter SC mode and setting SC switch to OFF means that closing the switch

will select Vario mode. There is a third option by setting SC switch to TASTER and

connecting a push button to the input; each key press will toggle between SC and Vario

(mandatory setting for LX Remote).

6.1.12.1.3 Temperature Offset

The system is supplied with an external outside air temperature (OAT) sensor. With the

offset setting it will correct static errors of temperature measurement.

There is another input called VARIO PRIORITY. When this input is activated by

grounding the appropriate wire the unit will change over to Vario immediately.

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LX NAV LX9070 Seite 65

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