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Kestrel

®

 4250 Racing Weather

®

 Tracker

15

Overwrite
(On/Off)

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 Off, new data points are not 

saved.

Press   or   to toggle between 

On and Off.

Man Store
(On/Off)

When On, data is stored when the 

 

button is pressed. When off, the 

 button 

is disabled.

Press   or   to toggle between 

On and Off.

Measurements

Measurement screens can be turned off, or “hidden” from the normal measurement navigation. For 
example, if wind chill is not of interest, it can be hidden. Press the   or   button to toggle between ON 

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 

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 specified 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   or   button. Select the highlighted measurement by 
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. 

Units

The units of measure can be adjusted to best suit the application. The following units are available: 

Wind Speed

m/s  

meters per second 

km/h  

kilometers per hour 

kt   

knots 

mph  

miles per hour 

fpm  

feet per minute 

Bft  

Beaufort

Temperature, Dewpoint,  

Wet Bulb Temp & Heat Index

°C     

Celsius 

°F     

Fahrenheit

Pressure

inHg  

inches mercury

hPa  

hectopascals

psi   

pounds per square inch

mb  

millibar

Altitude, Density Altitude

m  

meters 

ft  

feet

Moisture (Water Grains)

gpp  

grains per pound 

g/kg  

grams per kilogram

Air Density

lb/ft

3

   

pounds per cubic foot

kg/m

3

 

kilograms per cubic meter

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. 

Summary of Contents for 4250

Page 1: ...n Manual for Kestrel 4250 Racing Weather Tracker 4250 Racing Weather Tracker with Backlight In a hurry Be sure to read pages 5 7 to ensure that your Kestrel is setup properly www kestrelweather com 800 784 4221 Revised 07 29 10 ...

Page 2: ...N Hold to turn power on or off Press to enter and exit Main Setup Menu IMPELLER Zytec V bearings on a user replaceable impeller IMPELLER COVER Swivel cover protects impeller 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 TEMPERATURE SENSOR Hermetically sealed precision thermistor coiled to is...

Page 3: ...n the thin end Using tweezers can help Battery Installation Use only AAA batteries Install batteries as indicated on the battery door After installing the batteries the Kestrel 4250 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 K...

Page 4: ...te Time NAVIGATION The Kestrel 4250 is set up to display 9 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 one is hidden in default mode which simultaneously show 3 current measurements and the Date Time Screen Use the and buttons to scroll through the vario...

Page 5: ...e 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 with...

Page 6: ...de 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 fluctuate by a few feet After obtaining a current altitude from the ALTITUDE screen move to the BARO screen and enter thi...

Page 7: ...s of station pressure relative humidity and temperature and is not affected 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...

Page 8: ...ttings 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 or button Select the highlighted measurement by pressing the button Press the or button to increase or decrease the value of the limits Press the or button ...

Page 9: ...reconfigured 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 Highlight the desired User Screen by ...

Page 10: ... Monitoring In the Staging Lanes Auto Store On Store Rate 1 min Overwrite Off Man Store On These settings will allow you to track the conditions for more than 24 hours Measurements will be stored every minute and stop storing when the log is full This will let you review the data at your convenience To get the full use of the available memory be sure to clear data at the start of each race day MEM...

Page 11: ... altitude at which you would be given the current air density Often used by individuals who tune high performance internal combustion engines such as race car engines Also of interest pilots in order to determine how an aircraft will perform Dewpoint The temperature to which air must be cooled in order for condensation to occur The difference between dewpoint and temperature is referred to as the ...

Page 12: ... The cooling effect 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...

Page 13: ...fects your performance Period If you are not using something to measure the weather conditions then you are missing a piece of valuable information that can help you win races Environmental conditions such as relative humidity density altitude dewpoint and wind speed all influence your car By monitoring these conditions and analyzing how weather patterns from previous races change your car s perfo...

Page 14: ...d 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 airflow 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 airflow ov...

Page 15: ... 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 Pe...

Page 16: ... 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 Progra...

Page 17: ...ther 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 Please register your Kestrel Meter at www KestrelWeather com ...

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