4000
Pocket Weather®Tracker
with Backlight
In a hurry?
Be sure to read pages
5-7 to ensure that
your Kestrel is setup
properly!
Instruction Manual For Kestrel 4000 &
Kestrel 4000 NV Models
1
www.kestrelweather.com 800.784.4221
Revised 07/27/10
Revised 09/07
Kestrel® 4000 Pocket Weather® Tracker 3
MANUAL MEMORY
BUTTON Press to manually
store current conditions
to memory.
MEASUREMENT BUTTONS
Press to scroll between
screens: Date/Time,
Measurements, User
Dened Screens.
POWER/SETUP BUTTON
Hold to turn power on or
o. Press to enter and exit
Main Setup Menu.
IMPELLER Zytec™
V-bearings on a userreplaceable impeller.
IMPELLER COVER Swivel
cover protects impeller
BACKLIGHT BUTTON Press
to activate backlight for
1 minute.
MODE BUTTONS
Press to change mode of
measurements: Current, Min/
Max/Avg, Chart.
COMMAND BUTTON In Chart
Screens, press to view data
points. In Setup Menus, press
to make selection.
when not in use.
DATA UPLOAD OPTICAL
COUPLER Software and
serial port interface
sold separately.
BATTERY DOOR
Sealed with o-ring to
keep product watertight.
FRONT BACK
TEMPERATURE SENSOR
Hermetically sealed precision
thermistor coiled to isolate from
case temperature.
HUMIDITY SENSOR Capacitive
sensor with secondary
thermistor to improve
accuracy and response.
SERIAL NUMBER
PRESSURE SENSOR Monolithic
silicon piezoresistive sensor.
Do NOT insert any objects
into this hole.
AAA BATTERIES
Kestrel® 4000 Pocket Weather® Tracker 5
TABLE OF CONTENTS
GETTING STARTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
NAVIGATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SPECIAL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
MAIN SETUP MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
APPLICATION EXAMPLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
MEMORY CAPABILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
DEFAULT SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
FREQUENTLY ASKED QUESTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
CUSTOMER SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Congratulations on the purchase of your Kestrel 4000 Pocket Weather Tracker! The Kestrel 4000 is the next
generation of weather monitoring. Now, you can instantly measure EVERY major environmental condition
easily, accurately and right in the palm of your hand.
While the Kestrel 4000 is user-friendly and simple to use, reading the instruction manual is recommended in
order to use the Kestrel 4000 to its fullest potential.
NK, manufacturer of Kestrel Pocket Weather Meters, is available to answer questions and provide support.
Contact NK by phone: 610.447.1555, fax: 610.447.1577, email: info@nkhome.com, or
web: www.nkhome.com.
GETTING STARTED
Battery Installation
Use only AAA batteries. Install batteries as indicated on the battery door. After installing the batteries, the
Kestrel 4000 will automatically start in the Date and Time Setting mode. (See Date and Time Setup below.)
Custom settings and chart data will be saved during a battery change; only the date/time and MMA values
will be lost.
Turning the Kestrel Meter ON and OFF
To turn the Kestrel Meter ON, press the button. To turn the Kestrel Meter OFF, hold the button for two
seconds. Or, press the button, then press the button with the word OFF highlighted. (Note: your unit
will continue to automatically store data when the power is turned o.) When rst turned on, the Kestrel
Meter will display a splash screen displaying the model number, the battery indicator, and the code version.
This battery indicator will indicate the percentage of battery life remaining, which is helpful in preventing
unexpected dead batteries.
Date and Time Setup
The rst time that you turn on your Kestrel Meter, as well as after a battery change, you
will need to set the date and time. The Introduction Screen will appear for 3 seconds,
followed by the Date/Time Setup Screen. Press the and buttons to scroll through
the settings. Press the and buttons to scroll through the setting options. After
entering the date and time, press the button to exit the Date/Time Setup. Then press
the button again to exit the Main Setup Menu.
Kestrel® 4000 Pocket Weather® Tracker 7
NAVIGATION
Measurements use
Wind Speed
Temperature
Wind Chill
Humidity
Heat Index
DP
Dew Point
WB
Wet Bulb
Barometric Pressure
Altitude
D
Density Altitude
and
The Kestrel 4000 is set up to display 10 Measurements (some are
calculations) in 3 Modes.
The Measurements are listed here with their corresponding screen
icon. In addition to these Measurements and Modes, there are also 3
User Screens, which simultaneously show 3 current measurements,
and the Date & Time Screen, which gives the current date and
time. Use the
and buttons to scroll through the various
Measurements, followed by the 3 User Screens and the Date/Time
Screen. Any of these screens can be turned o so that you can
customize your Kestrel Meter to show the screens that your application
requires. (See the Measurements section in the Main Menu.)
The Modes are displayed below. Use the and buttons to scroll
through the various Modes. From any mode, you may still scroll to a
dierent Measurement by pressing the and buttons.
Current - Displays the instantaneous reading.
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.)
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.
Value
Chart
Cursor
Date & Time
Kestrel® 4000 Pocket Weather® Tracker 9
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 o. (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 aect 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. The Kestrel 3500 NV has a night-vision preserving backlight which helps users to sustain natural
night vision. The NV’s backlight incorporates an optical lter to reduce overall brightness and minimize
blue and green spectrum light to preserve night vision. Additionally, the backlight is much dimmer than a
standard backlight, making it more dicult to detect with the naked eye in night operations. This backlight
appears soft greyish pink (not red) and is still in the visible spectrum, so it is not compatible with nightvision 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.
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 specications, please follow these recommendations:
• Avoid taking measurements in direct sunlight, which will heat the air inside the humidity sensor
• If your circumstances force you to expose the Kestrel Meter to a large temperature swing prior to taking
button to activate the backlight. The light will remain activated for one minute. Press the
enclosure and cause inaccurate readings.
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.
Kestrel® 4000 Pocket Weather® Tracker 11
• Ideally, provide an airow of at least 1 M/S (2.2 MPH), over the temperature sensor—point the
Kestrel Meter into the airow. If there is no airow, simply wave the unit back and forth so air
passes over the sensors. With airow over the temperature sensors and humidity chambers,
readings within specications will be provided within two to three minutes, even after a large
temperature shift.
• If no airow can be provided, you must allow sucient 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 conrm 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 signicantly. At that point, the RH value is stable and can be relied upon to be within the
accuracy specications.
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”. Fortunately, 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.
decrease the reference pressure. You will notice that the altitude will change with changes in the reference
pressure. Press the button to exit the adjustment mode. Set your Kestrel Meter down on a table and
allow the altitude reading to stabilize. (Note: very small changes in pressure generate noticeable changes
in altitude. In order to provide meaningful readings for activities where altitude changes quickly, the Kestrel
Meter features rapid altitude response. This is why the altitude readings tend to uctuate by a few feet.)
After obtaining a current altitude from the ALTITUDE screen, move to the BARO screen and enter this value
as your reference altitude by following the same procedure. Both readings will now be accurate.
to increase the reference altitude or the button to decrease the reference altitude. You will notice that
the barometric pressure will change with changes in the reference altitude. Press the button to exit the
adjustment mode. Again, allow the Kestrel Meter to stabilize, then enter the value from the BARO screen
as your reference pressure on the ALTITUDE screen by following the same procedure. Both readings are
nowaccurate.
When reviewing stored data, remember that changes in pressure AND changes in location/altitude will
aect the stored values. When tracking pressure changes relative to weather, set the reference altitude on
the BARO screen and keep the Kestrel Meter in one location. Your graph history will now show trends in
Starting with the known barometric pressure for your location: You can obtain your
current barometric pressure by checking an internet weather site for a nearby location,
or contacting a local airport. Set this value as your reference pressure on the ALTITUDE
screen to determine your correct altitude: Press the button to enter the reference
setting mode. Press the button to increase the reference pressure or the button to
Starting with a known altitude for your location:
topographical map or local landmark. Google Earth is an excellent free program that
provides the exact altitude for any given address: www.earth.google.com/. Set this
value as your reference altitude on the BARO screen to determine your barometric
pressure. Press the button to enter the reference setting
You can obtain your altitude from a
mode. Press the button
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 aect the accuracy of the altimeter over time. This is why aircraft reset their altimeters
at every aireld 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 aected 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 dened 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)
Reset MMA
(Go/Done)
All stored data is cleared. This will also clear
Min/Max/Avg data.
All Min/Max/Avg data is cleared. Chart data
will remain intact.
Press or to clear the log.
Press or to clear the MMA.
Kestrel® 4000 Pocket Weather® Tracker 15
Auto Store
(On/O)
Store Rate*
(2 sec – 12 hr)
Overwrite
(On/O)
Man Store
(On/O)
* When unit is o, data is NOT stored for 2 sec and 5 sec Store Rates.
Measurements
Measurement screens can be turned o, or “hidden” from the normal measurement navigation. For
example, if wind chill is not of interest, it can be hidden. Press the
and OFF for each individual measurement. Press the or button to highlight the desired measurement.
Press the button to return to the Main Setup Menu. Even when measurements are hidden, the Kestrel
Meter will continue to log data for all measurements. If you wish to see the logged data for measurements
When On, data is automatically stored at
preset Store Rate. When O, data is only
stored when manually captured with the
button.
The frequency at which data sets are
automatically stored. (Battery life may be
shortened if data is stored frequently.)
This setting only applies when the data
log is full. When On, oldest data point is
discarded to allow memory for the new
data point. When O, new data points are
not saved.
When On, data is stored when the
button is pressed. When o, the button is
disabled.
or button to toggle between ON
Press or to toggle between
On and O.
Press or to increase or
decrease Store Rate frequency.
Press or to toggle between
On and O.
Press or to toggle between
On and O.
that are hidden, simply enter the Measurement screen and turn them back on. The data will be stored in the
same manner as all other measurements, as specied in the Store Rate.
Graph Scale
These settings control the chart limits of your Kestrel Meter. Depending on the conditions, the lower and
upper limits of the chart scale may need to be adjusted in order to get the best view of the data. Highlight
the desired measurement by pressing the
pressing the button. Press the or button to increase or decrease the value of the limits. Press the
or button to change between the upper and lower limits. Press the button to exit and return to the
Measurement Selection screen. Press the button to return to the Main Setup Menu.
Wind Speed Temperature, Dewpoint,
m/s meters per second
km/h kilometers per hour
kt knots
mph miles per hour
ft/m feet per minute
Bft Beaufort
Wet Bulb Temp, Wind Chill &
Heat Index
°C Celsius
°F Fahrenheit
or button. Select the highlighted measurement by
Pressure Altitude,
InHg inches
mercury
HPa hectopascals
psi pounds per
square inch
mb milibar
Density
Altitude
m meters
ft feet
Kestrel® 4000 Pocket Weather® Tracker 17
Units
The units of measure can be adjusted to best suit the application. The following units are available:
Highlight the desired measurement by pressing the or button. Press the or button to scroll
through the available units. Press the button to return to the Main Setup Menu.
User Screens
The three User Screens can be recongured to display the most appropriate information for your
application. For example, if you need to monitor the wind speed, humidity and barometric pressure, a User
Screen can display these current measurement values on the same screen for quick reference. Only current
measurements can be selected for the User Screens - Min/Max/Avg and Charts are not available.
From the Main Setup Menu, highlight the desired User Screen by pressing the or button. Press the
button to select the highlighted User Screen. Press the or buttons to change lines, and the or
button to scroll through the available measurements for each highlighted line. Press the button to
return to the User Screen Setup Menu. Repeat above process for the other User Screens or press the
button to return to the Main Setup Menu. The User Screens may also be hidden if not needed.
System
The display Contrast and Auto Shutdown can be recongured as required. The relative humidity and
pressure sensors can also be recalibrated. Press the or buttons to highlight the appropriate selection,
and the or button to adjust or select.
The Contrast can be adjusted for better visibility depending on the ambient lighting conditions. Press the
or button to increase or decrease the contrast from 0 to 20 (0 is lightest, 20 is darkest).
The display can be set to automatically turn o in order to conserve the battery life. Auto Shutdown will
only occur after the preset time has elapsed without any button presses. Press the or button to scroll
through the Auto Shutdown options (15 minutes, 60 minutes, O). Battery life will be shortened if the Auto
Shutdown is turned to O.
Baro Cal - Recalibration of this sensor is not typically required, and it is not recommended that you recalibrate
without speaking to an NK technician. The pressure sensor can be calibrated if necessary. It is extremely
important to know the precise altitude and mean sea level barometric pressure at the time of calibrating
the sensor. First, set the reference altitude on the BARO measurement screen to the known altitude (see
Pressure Adjustment section for instructions). Then adjust the calibrating setting on the Baro Cal screen to
the known mean sea level barometric pressure. If recalibration is desired, the unit may also be returned to
NK for service.
Humidity Cal - Recalibration of this sensor is not typically required, and it is not recommended that you
recalibrate without speaking to an NK technician. The humidity sensor can be calibrated by “teaching” it
the correct humidity. Some special equipment is required for this calibration, including two hermetically
sealed containers and saturated salt solutions. NK oers a calibration kit, and instructions are available
on www.nkhome.com. If recalibration is desired, the unit may also be returned to NK for service.
Date & Time
The date and time, as well as date and time formats, can be adjusted. The Time Formats available are 12
hour and 24 hour. The Date formats available are day/month/year and month/day/year. (See the Date and
Time Set Up section for instructions.) Press the
Language
Displayed text can be set in one of ve languages: English, French, German, Italian or Spanish. To choose
a language, use the or buttons to highlight the desired language. Press the button to select the
language and return to the Main Setup Menu. Otherwise, press the button to return to the Main Setup
Menu without changing languages.
Restore
Default settings for units of measure, date and time formats, and system settings can be restored. (See the
Factory Default Settings section for more information.) Press the or button to highlight the desired
button to return to the Main Setup Menu.
Kestrel® 4000 Pocket Weather® Tracker 19
default setting: Metric, Imperial or Defaults. Press the or button to reset the factory setting. Press the
button to return to the Main Setup Menu.
APPLICATION EXAMPLES
This section provides examples of applications where a Kestrel Meter might be used, and the appropriate
memory settings.
Weather Monitoring
Auto Store On
Store Rate 1 hr
Overwrite On
Man Store O
These settings will allow you to track conditions for 2 months. When the memory is full, each new
measurement will be stored in place of the oldest data point. The charts will provide a quick look at the
recent weather conditions. Keep an eye out for falling barometric pressure, which indicates that a storm
is coming.
Hiking/Camping for the Weekend
Auto Store On
Store Rate 20 min
Overwrite O
Man Store On
These settings will allow you to track the conditions for almost 20 days. Measurements will be stored every
20 minutes, and stop storing when the log is full. This will let you review the trip at your convenience when
you return. You can also manually store the conditions, in case you get caught in 40 mile per hour winds or
make it to the top of a mountain. For more detailed information on your trip, set the Store Rate to 2 hours
overnight, and 10 minutes during the day.
Soaring/Hang Gliding
Auto Store On
Store Rate 2 min
Overwrite O
Man Store On
These settings will allow you to track all conditions for 46 hours. Chart your altitude changes, watch how
the temperature and humidity vary with altitude, and log your apparent speed. Data will no longer be
stored once the log is full, in order to preserve it until it can be reviewed later. Be sure to clear the data log
just before your ight.
Skydiving
Auto Store On
Store Rate 2 sec
Overwrite O
Man Store O
These settings will allow you to record a detailed account of your jump. Be sure to clear the data log just
before jumping. As you descend toward the ground, you will be tracking the altitude every two seconds, as
well as the conditions at that altitude. The chart will clearly show the point at which the parachute opens, as
well as the point you get back on the ground.
Kestrel® 4000 Pocket Weather® Tracker 21
HVAC - Environmental Monitoring
Auto Store On
Store Rate 5 min
Overwrite On
Man Store O
These settings will record conditions every ve minutes, for a total storage of almost 2 days. You can
monitor the conditions in a laboratory or manufacturing plant, both day and night, to determine if the
climate control is working properly. Or you can examine the eect on the environment when employees
enter and exit the building.
HVAC/R - System Balancing
Auto Store O
Store Rate —
Overwrite O
Man Store On
These settings will require you to press the Manual Store Button in order to store any data at a duct, hood,
vent, or other air system. The meter will not store any data automatically. Be sure to record the location and
date/time of storage for reference when reviewing the data. After storing the conditions at each location,
simply review the data and balance the system.
MEMORY CAPABILITIES
Store Rate Total Memory
2 sec 1 hr, 6 min, 40 sec
5 sec 2 hr, 46 min, 40 sec
10 sec 5 hr, 33 min, 20 sec
20 sec 11 hr, 6 min, 40 sec
30 sec 16 hr, 30 min
1 min 1 day, 9 hr, 20 min
2 min 2 days, 18 hr, 40 min
5 min 6 days, 22 hr, 40 min
10 min 13 days, 21 hr, 20 min
20 min 27 days, 18 hr, 40 min
30 min 41 days, 16 hr
1 hr 83 days, 8 hr
2 hr 166 days, 16 hr
5 hr 416 days, 16 hr
12 hr 1000 days
GLOSSARY
The below denitions have been greatly simplied in order to keep this section brief. We strongly
recommend that anyone who wishes to make use of these measurements refer to one of the many
excellent weather references available for a more in-depth denition. On the internet, visit www.usatoday.
Kestrel® 4000 Pocket Weather® Tracker 23
com or www.noaa.gov. Or, locate the USA Today publication, The Weather Book. Please note that any words
in a denition printed in italics are themselves dened in this glossary.
Altimeter Setting
An aviation term for the local barometric pressure. Same as reference pressure.
Altitude
The distance above sea level. The Kestrel Meter calculates altitude based on the measured station pressure
and the input barometric pressure - or “reference pressure”.
Barometric Pressure
The air pressure of your location reduced to sea level. Pressure will change as weather systems move into
your location. Falling pressure indicates the arrival of a low pressure system and expected precipitation or
storm conditions. Steady or rising pressure indicates clear weather. A correct altitude must be input for the
Kestrel Meter to display barometric pressure correctly.
Density Altitude
The altitude at which you would be, given the current air density. Often used by pilots in order to determine
how an aircraft will perform. Also of interest to individuals who tune high performance internal combustion
engines, such as racecar engines.
Dewpoint
The temperature to which air must be cooled in order for condensation to occur. The dierence between
dewpoint and temperature is referred to as the “temperature/dew point spread”. A low dewpoint spread
indicates high relative humidity, while a large dewpoint spread indicates dry conditions.
Heat Index
A practical measure of how hot the current combination of relative humidity and temperature feels to a
human body. Higher relative humidity makes it seem hotter because the body’s ability to cool itself by
evaporating perspiration is reduced.
Reference Pressure
The local barometric pressure. Input to the altitude screen to provide correct altitude readings. Also known
as the altimeter setting.
Relative Humidity
The amount of water vapor actually in the air divided by the maximum amount of water vapor the air could
hold at that temperature, expressed as a percentage.
Station Pressure
The air pressure of your location, NOT reduced to the sea level equivalent.
Temperature
The ambient air temperature.
Wet Bulb Temperature
The lowest temperature to which a thermometer can be cooled by evaporating water into the air at constant
pressure. This measurement is a holdover from the use of an instrument called a sling psychrometer. To
measure wet bulb temperature with a sling psychrometer, a thermometer with a wet cloth covering over
the bulb is spun rapidly through the air. If the relative humidity is high, there will be little evaporative
cooling and the wet bulb temperature will be quite close to the ambient temperature. Some exercise
physiology guides use wet bulb temperature, rather than heat index, as a measure of the safety of exercise in
hot and humid conditions.
Kestrel® 4000 Pocket Weather® Tracker 25
Wind Chill
The cooling eect of combining wind and temperature. The wind chill gives a more accurate reading of
how cold it really feels to the human body. The Kestrel Meter’s wind chill is based on the National Weather
Service standards as of November 1, 2001.
DEFAULT SETTINGS
UNIT METRIC IMPERIAL
Wind Functions M/s mph
Temperature Functions °C °F
Barometric Pressure hPa inHg
Altitude Functions M Ft
Time Format 24 hour 12 hour
Date Format Day/month/year Month/day/year
SETTING FACTORY DEFAULT
Automatic Data Store On
Data Store Rate 1 hour
Data Overwrite On
Manual Data Store On
User Screen 1 Wind speed, temperature, humidity
User Screen 2 Humidity, dewpoint, wet bulb
User Screen 3 Pressure, altitude, density altitude
Display Contrast 10
Automatic Shutdown 15 minutes
Language English
PC Upload
Stored data may be uploaded to a PC with the optional Kestrel Interface.
FREQUENTLY ASKED QUESTIONS
How do I set my Kestrel Meter to read the correct barometric pressure and altitude?
To measure these values accurately, you must know either your current pressure or altitude. If you know
the current barometric pressure, go to the altitude screen, and press the button to enter the reference
pressure. As you adjust the reference pressure, you will notice that the altitude will change. Once the
reference pressure is entered, note the new altitude, and go to the barometric pressure screen. Press the
button to enter this altitude as the reference altitude. Your Kestrel Meter is now displaying the accurate
pressure and altitude. (If you start with a known altitude, simply start with entering this value as the
reference altitude on the barometric pressure screen. The adjust the reference barometric pressure on the
altitude screen.)
You will need to update the reference pressure and altitude as you change altitude or the weather changes.
For more information on this topic, see the Barometric Pressure and Altitude Adjustment section under
“Special Functions.”
Kestrel® 4000 Pocket Weather® Tracker 27
Why is my Kestrel Meter is not registering wind speed?
It probably just needs a replacement impeller. You can verify this by removing the impeller (press rmly
on the sides of the impeller), and turn the unit on to the wind speed screen. Hold the Kestrel Meter near a
television, computer monitor or some electronic device and it will display a wind speed. Or, wave a magnet
(like a refrigerator magnet) back and forth by the Kestrel Meter. If the Kestrel Meter is working properly,
you will register a wind speed reading, even though there is no impeller installed. Simply purchase a new
impeller and your Kestrel Meter’s wind speed readings will be restored to factory calibration.
What is the best way to take accurate temperature and humidity readings?
Avoid taking measurements in direct sunlight, and be sure there is airow over the sensors. Especially if you
expose the Kestrel Meter to a large temperature swing prior to taking a reading (such as taking a Kestrel
Meter from the indoors to the outdoors in the winter), airow over the sensors is necessary to measure
accurate temperature and humidity readings. You can ensure airow by either placing the Kestrel Meter in
a breeze, or by waving it back and forth. If no airow can be provided, you must allow up to 20 minutes for
the values to stabilize and accurate readings to be displayed.
Can my Kestrel Meter measure water speed by placing it in wind speed mode and submerging it?
Even though your Kestrel Meter is fully waterproof and can be submerged without damage, the viscosity
of water is dierent than that of air. The Kestrel Meter will display a value, but the readings will not be the
accurate water speed.
Why does my screen turn black in the heat? Why does screen become sluggish or blank in the cold?
The liquid crystal display used in Kestrel Meters has an operational temperature range of –14.0 to 131.0°F
(–10.0 to 55.0°C). Above this temperature, the whole screen will turn black. Below this temperature, the
liquid crystals will freeze and not display a reading. Even in these conditions, your Kestrel Meter will still
continue to measure and record readings as specied by the automatic and manual data storage rates,
you will just not be able to read the display until the environment’s temperature is within the operational
range. In cold environments, you can keep the Kestrel Meter warm in your pocket and remove it only to
take readings. Be sure to wave the unit back and forth to create airow over the sensors to ensure the most
accurate reading possible.
Why doesn’t my Kestrel Meter match the local Weather Report?
Obtaining a weather report from a local television station, airport or internet site will give you the weather
where those instruments are, which is not necessarily the same as where you are. Your Kestrel Meter is
measuring the conditions right where you are. The nature of microclimates and weather fronts is that they
are varied, and even locations as close as a mile apart can have dierent weather readings. You can certainly
use these weather reporting services for good estimates of what the conditions will be, but for the most
accurate readings at your particular location, the Kestrel Meter is better.
CUSTOMER SERVICE
KESTREL POCKET WEATHER METERS 5-YEAR LIMITED WARRANTY
NK does not believe in “disposable electronics.” We know that Kestrel Meters don’t typically
lead pampered lives, and we design them for years of performance in tough conditions. Every
Kestrel is designed and manufactured at NK’s facility in Boothwyn, Pennsylvania, to be the accurate, reliable weather instrument you need for your application. If for any reason you are not
satised with the performance or operation of your Kestrel meter in the rst 30 days, you may
return it to your place of purchase for a full refund.
We guarantee every Kestrel Pocket Weather Meter to be free of defects in materials and
Kestrel® 4000 Pocket Weather® Tracker 29
workmanship for a period of FIVE YEARS from their date of rst consumer purchase. NK
will repair or replace any defective product or part when notied within the warranty period,
and will return the product via domestic ground shipping or NK’s choice of method of international shipping at no charge.
The following shall be excluded from warranty coverage: damage due to improper use or
neglect (including corrosion); damage caused by severe or excessive impact, crushing or mechanical harm; modications or attempted repairs by someone other than an authorized NK/
Kestrel repair agent; impeller failure not caused by a manufacturing defect; normal usage wear;
failed batteries; and accuracy issues resolvable by recalibration. Recalibration is provided free of
charge within thirty (30) days of purchase if necessary.
Except for the warranties set forth herein, NK disclaims all other warranties, expressed,
implied or statutory, including, but not limited to, the implied warranties of merchantability or tness for a particular purpose. Any implied warranties that may be imposed
by applicable law are limited to the term of this warranty. In no event shall NK be liable
for any incidental, special or consequential damages, including, but not limited to, loss
of business, loss of prots, loss of data or use, whether in an action in contract or tort or
based on a warranty, arising out of or in connection with the use or performance of an NK
product, even if NK has been advised of the possibility of such damages. You agree that
repair, and (upon availability) replacement, as applicable, is your sole and exclusive remedy with respect to any breach of the NK Limited Warranty set forth herein. All product
liability and warranty options are governed exclusively by the laws of the Commonwealth of
Pennsylvania.
Your warranty period will be measured from your date of purchase. The best way to ensure
full warranty coverage is to REGISTER your NK product promptly on our website: www.
kestrelweather.com. We keep your registration information strictly condential and do not
sell it, share it, or use it for anything but product-related information bulletins (which you may
decline receiving). If you do not register and cannot provide proof of purchase, your warranty
period will be measured from our date of manufacture, determined by serial number.
We request that you contact NK if you feel your product is not working properly. We can often
solve product issues by phone or e-mail, saving you the time and expense of returning the unit.
If we require the product to be returned, we will issue a Return Authorization to expedite the
handling of your warranty claim.
The Kestrel Pocket Weather Meters are covered by the following patents: 5,783,753, 5,939,645,
6,257,074, and 7,059,170.
Calibrations, Certications and Service
Every NK product is tested and calibrated before it leaves our factory. We guarantee that it will perform
within specications when you receive it. Each Kestrel Meter comes with a Certicate of Conformity, with
the stated specications for that product on the back. If you feel an NK product is not meeting specs when
you receive it, call us and we’ll make sure you are operating it correctly. If it still appears that it may be out
of spec, return it to us within 30 days of purchase and we will test and recalibrate all values at no charge.
Kestrel® 4000 Pocket Weather® Tracker 31
Beyond 30 days, we oer reasonably-priced tests, calibration services and N.I.S.T. certied calibrations as
well as Kestrel Meter tune-ups.
All of our measurements are traceable to the National Institute of Standards and Technology, ensuring
the highest level of accuracy. Our primary Calibration Standards are sent for calibration in accordance
with N.I.S.T. requirements and based on a regular schedule. Only approved laboratories and N.I.S.T
themselves are used for these calibration services. Incoming and outgoing data is supplied with the
certicate of calibration.
We also oer full factory service on every product we manufacture for as long as we make the product (and
as long after as component availability permits). If we can’t repair a product, we will oer you a brand-new
replacement under our Customer Care Program (even for accidental damage and misuse). Cost of repairs
and other important information can be found on our website.
We request that you contact NK if you feel your product is not working properly. We can often solve product
issues by phone or e-mail, saving you the time and expense of returning the unit. If we require the product
to be returned, we will issue a Return Authorization to expedite the handling of your claim.
Visit www.kestrelweather.com for more information and pricing for these services.
Lifetime Customer Care Warranty
NK wants you to be an NK customer for life, so we take care of you even beyond the terms of the above
warranty with our Customer Care Program. Trade-in any Kestrel Pocket Weather Meter, no matter the age or
condition, and receive a generous discount on the replacement product (same model only). Our Customer
Care Program applies only as long as we manufacture the product, and does not cover product upgrades.
Need Help?
Our NK Knowledge Center has answers to many common questions, along with tips and tricks for using
NK products. It’s available 24-7 at www.nkhome.com/knowledgecenter/.
For email assistance with the installation or operation of your NK product,
write techsupport@nkhome.com.
For help with an apparent malfunction, or to arrange or inquire about a repair,
write repairs@nkhome.com.
Or call 800.784.4221 (610.447.1555 outside of the USA), Monday to Friday, 9 to 5, East Coast Time.
Kestrel® Pocket Weather® Meters are designed and manufactured in the USA by:
NIELSEN-KELLERMAN
21 Creek Circle, Boothwyn, PA 19061
Phone: (610) 447-1555 Fax: (610) 447-1577
Web: www.kestrelweather.com
Email: kestrel@nkhome.com
Instruction Manual for Kestrel 4000 version: 4.29 ALL
Please register your Kestrel Meter at www.KestrelWeather.com
Kestrel® 4000 Pocket Weather® Tracker
Kestrel® Pocket Weather® Meters are designed and manufactured in the USA by:
NIELSEN-KELLERMAN
21 Creek Circle, Boothwyn, PA 19061
Phone: (610) 447-1555 Fax: (610) 447-1577
Web: www.kestrelweather.com
Email: kestrel@nkhome.com
Instruction Manual for Kestrel 4000 version: 4.29 ALL
Please register your Kestrel Meter at www.KestrelWeather.com
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