Kestrel 4300 (Construction) Manuel d'utilisateur télécharger pdf (Page 6)

Kestrel

4300 Construction Weather Tracker 11

While viewing the Min/Max/Avg screen for any of these measurements, hold the unit into the wind, and

press the button when the screen displays “--average” to begin collecting data for all measurements, and

again when the screen displays “--stop” to stop collecting data and hold the values on the display. Press the

button when the screen displays “--clear” to clear the data. This routine will work simultaneously for all

measurements, regardless of which one is displayed while the routine is run. The Max/Avg for these wind

values will not aect any other Min/Max/Avg or stored data.

Manual Data Storage

To manually store data, press the button. One of the following will appear: Data Stored (data has been

captured and will appear on chart), Full (Overwrite is o and data log is full), or O (Manual Store button

has been disabled). (See the Main Setup Menu section for more information on memory.)

Backlight

The Kestrel Meter has a high-visibility green backlight, which makes the display easily read in low–light

conditions. Press the button to activate the backlight. The light will remain activated for one minute.

Press the button within one minute to deactivate the light manually.

Relative Humidity

The Kestrel Meter is capable of measuring RH to a high accuracy: +/– 3% RH between 5 and 95%. To ensure

operation within these specications, please follow these recommendations:

• Avoid taking measurements in direct sunlight, which will heat the air inside the humidity sensor

enclosure and cause inaccurate readings.

• If your circumstances force you to expose the Kestrel Meter to a large temperature swing prior to taking

a relative humidity reading (such as when taking a Kestrel Meter stored inside at 70° F outside to a

temperature of 40° F), you will need to take additional steps to ensure that the Kestrel Meter’s external

temperature sensor is in thermal equilibrium.

- Ideally, provide an airow of at least 1 M/S (2.2 MPH), over the temperature sensor—point the

Kestrel Meter into the airow. If there is no airow, simply wave the unit back and forth so air

passes over the sensors. With airow over the temperature sensors and humidity chambers,

readings within specications will be provided within two to three minutes, even after a large

temperature shift.

- If no airow can be provided, you must allow sucient time for the RH value to stabilize. This can

take as long as 20 minutes—the greater the temperature change, the greater the time. You can

use the logging capability of the Kestrel Meter to conrm that the unit has stabilized to

a correct reading: Set the memory options to a relatively short logging interval (20 seconds

works well), select the graphical display of RH, and you can see when the value is no longer

changing signicantly. At that point, the RH value is stable and can be relied upon to be within the

accuracy specications.

Barometric Pressure and Altitude Adjustment

The Kestrel Meter measures station pressure—the actual air pressure in the measurement location—and

uses this value to calculate barometric pressure and altitude. Station pressure changes in response to

two things—changes in altitude and changes in the atmosphere. Because the Kestrel Meter is constantly

changing location and altitude, it is important to enter adjustments or “references” when accurate pressure

and altitude readings are needed.

Barometric pressure is station pressure corrected to sea level. In order to make the correction, the Kestrel

Meter needs an accurate reference altitude. Altitude is the height above sea level. In order to correctly

calculate altitude, the unit needs an accurate barometric pressure reference, also known as an “altimeter

setting”. You only need to know ONE of these values (current barometric pressure or current altitude) in

order to set your Kestrel Meter up to show accurate readings.

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Kestrel 4300 (Construction) Manuel d'utilisateur Page 6

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