Sensor Calibration; Calibration Procedure; Pressure Altitude Calculation - Kanardia INDU COMBO Manual

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Combo — Manual

Sensor Calibration & Altitude Calcu-

lation

6.1

Each unit is factory calibrated against reference barometer at dif-

ferent pressure points. In standard calibration range we calibrate in

following pressure sequence: 1100, 1000, 900, 800, 700, 600, 500, 400,

280, 550, 650, 750, 850, 950 and 1050 hPa. These measurements are

then repeated at diﬀerent temperatures ranging from -10 to 60 C in

7 C steps.

Please note that FAA Part 43, Appendix E does not require calibra-

tion/veriﬁcation at diﬀerent temperatures. But temperature calibra-

tion is essential for any electronic sensor.

This means that each instrument is calibrated against 13 · 11 = 143

diﬀerent temperature - pressure pairs. The least squares method is

then applied on this results in order to obtain corrections coeﬃcients.

A two dimensional, third degree polynomial is used for the correction

model.

You can't change calibration parameters, but you can adjust the

altitude. Please refer to the section 3.1 for more details.

6.2

Pressure altitude is calculated according to the ISA 1976 model of

athmosphere. First two athmosphere layers are used; throposphere

and thropopause. The throposphere is modeled by equation (1) up

to 11000 meters of geopotential altitude. The thropopause layer is

modeled by equation (2) up to 20000 meters of geopotential altitude.

As the pressure sensor is calibrated down to 100 hPa (about 16000

meters) altitudes above 16000 meters are not reliable.

6. Sensor Calibration

Kanardia 2015-2018

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