Kestrel 4000 Manuale Utente Scaricare il pdf (Pagina 7)

Kestrel

4000 Pocket Weather

Tracker 13

barometric pressure. Your altitude as shown on the ALTITUDE screen will change as the weather changes,

but you can ignore this screen for this purpose.

If you are planning a day hike would like to track your altitude, you’ll need to enter the correct reference

pressure on the ALTITUDE screen as described above in “starting with the known barometric pressure.”

You can now track the altitude changes as you hike. In this instance, you should ignore the values on the

BARO screen, since the pressure changes will be due to changes in elevation far more than to changes in

the weather.

In general, changes in barometric pressure associated with weather changes are small over the course of

one day, but they will aect the accuracy of the altimeter over time. This is why aircraft reset their altimeters

at every aireld by entering the eld’s “altimeter setting” or reference pressure. Accordingly, if accurate

altitude readings are your primary interest, you should reset the reference pressure on your Kestrel Meter

regularly. If you encounter an elevation landmark, you can adjust the reference pressure until the altitude

matches the landmark elevation. This will correct the altitude for any pressure changes due to the weather.

(Or, you can obtain an updated reference pressure from the sources described above.)

Some nal notes - If you wish to know the actual or station pressure for your location (such as for engine

tuning), simply set the reference altitude on the BARO screen to “0”. In this case, the Kestrel Meter will

not make any adjustment and will display the measured value. (Engine tuning and ballistics software

sometimes refer to atmospheric or station pressure as “absolute pressure.” These applications are

concerned with the actual air density, as opposed to pressure gradients relating to weather, so barometric

pressure is less useful.)

Also, the above discussion applies to ALL pressure altimeters, including one you may have in a watch or

other device, but not to GPS altimeters, which use satellite triangulation to determine altitude. Note that

with present GPS technology, pressure altimeters remain more accurate for measuring altitude change. This

is why airplanes still rely on pressure altimeters, not GPS.

Finally, the DENSITY ALTITUDE screen is calculated from the absolute values of station pressure,

relative humidity and temperature, and is not aected by the reference values entered in the BARO and

ALTITUDE screens.

MAIN SETUP MENU

You can customize your Kestrel Meter in multiple ways. Press the button to access the Main Setup Menu.

Press the button to select the highlighted setting. The Main Setup Menu contains: OFF, Memory Options,

Measurements, Graph Scale, Units, User Screens, System, Date & Time, Language and Restore.

O

Press the then the button to turn the display o. Even when the Kestrel Meter’s display is turned

o, the unit will continue to automatically store data at the dened Store Rate. The battery life will be

decreased if data is stored frequently. The only way to completely shut o the unit is to remove the

batteries. Custom settings and data will be stored when the batteries are removed.

Memory Options

These settings control the data storage properties.

Setting Description Operation

Clear Log

(Go/Done)

All stored data is cleared. This will also clear

Min/Max/Avg data.

Press or to clear the log.

Reset MMA

(Go/Done)

All Min/Max/Avg data is cleared. Chart data

will remain intact.

Press or to clear the MMA.

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Kestrel 4000 Manuale Utente Pagina 7

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