Kestrel 4000 Instruction Manual page 3

Kestrel 4000 Pocket Weather Tracker
® ®
NAVIGATION
The Kestrel 4000 is set up to display 10 Measurements (some are
Measurements use and
calculations) in 3 Modes.
Wind Speed The Measurements are listed here with their corresponding screen
icon. In addition to these Measurements and Modes, there are also 3
Temperature
User Screens, which simultaneously show 3 current measurements,
and the Date & Time Screen, which gives the current date and
Wind Chill
time. Use the
Humidity
Measurements, followed by the 3 User Screens and the Date/Time
Screen. Any of these screens can be turned off so that you can
HI
Heat Index
customize your Kestrel Meter to show the screens that your application
DP
Dew Point
requires. (See the Measurements section in the Main Menu.)
WB
Wet Bulb The Modes are displayed below. Use the
through the various Modes. From any mode, you may still scroll to a
Barometric Pressure
different Measurement by pressing the
D
Altitude
Current - Displays the instantaneous reading.
Density Altitude
Min/Max/Avg - Displays the Minimum/Maximum/Average readings
from stored data. If there is no stored data, the values will be
displayed as --.-.
Chart - Displays a graphical representation of up to 2000 stored
data points for each measurement. If there is no stored data, the axis
will appear, but the chart will be blank. (See the following section
for information on Chart Navigation.)
Kestrel 4000 Pocket Weather Tracker
® ®
SPECIAL FUNCTIONS
User Screens
The Kestrel Meter has three User Screens that can be customized to display three
current measurements simultaneously. These screens can also be turned off. (See the
Main Menu section for setup instructions.)
Max/Avg for Wind Speed & Wind Chill
The Max/Avg values for the wind speed and wind chill values are measured independently from the stored
and charted data.
This allows the user to start and stop the averaging period in the most appropriate manner for their
application. Averaging on all wind-related values (Wind Speed and Wind Chill) will be started and
stopped together.
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 affect 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 off and data log is full), or Off (Manual Store button
has been disabled). (See the Main Setup Menu section for more information on memory.)
and buttons to scroll through the various
and buttons to scroll
and buttons.
Modes use and
Navigation of Charts
The Kestrel 4000 is capable of storing up to 2000 data points for each measurement. To review the data,
press the button while viewing a chart. A cursor will appear on the most recent data point. Press the
and buttons to scroll through the data points. The date and time at which the data was stored will be
displayed at the bottom of the screen, and the data value will be displayed at the top of the screen. Hold
down the or button to scroll quickly through the data points.
Press the or button to review the data for the other measurements. Please note that the cursor will
remain at the same date and time. If new data is stored while viewing chart data, the entire chart will shift
left with the new data point charted on the right. The cursor will not shift with the chart.
Press the button to return to the Chart Mode.
Backlight
The Kestrel Meter has a high-visibility green backlight, which makes the display easily read in low-light
conditions. The Kestrel 4000 NV is olive drab with a night-vision preserving backlight. The backlight
incorporates an optical filter to reduce overall brightness and minimize blue and green spectrum light to
preserve night vision of users such as military personnel, pilots and night fishermen. (Note: This backlight
appears soft greyish pink, not "red", and is still in the visible spectrum, so is not compatible with night-
vision equipment.) It takes 30 to 45 minutes for the average eye to adapt to darkness and maximize night
vision. Even a short burst of white, yellow, green or blue light "bleaches out" the rod cell photoreceptors in
the eye and causes night blindness until the entire adaptation process can take place again. Light in the
red spectrum does not cause this "bleaching out", preventing night blindness and night vision fatigue. This
unit's backlight is also much dimmer than a standard backlight, making it more difficult to detect with the
naked eye in night operations.
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 specifications, please follow these recommendations:
• A void taking measurements in direct sunlight, which will heat the air inside the humidity sensor
enclosure and cause inaccurate readings.
• I f 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.
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