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Kestrel

®

 4250 Racing Weather

®

 Tracker

27

I don’t have E.T. prediction software, any help you can offer how I can dial in with the Kestrel alone?

We went to the experts to get an answer for this one. Here’s how they do it at Martino Motorsports: The 

density altitude reading is the most important to us. For every 150 ft. increase in DA, our car will lose .01 in 

elapsed time, and for every 150 ft. decrease our car will pick up .01 in elapsed time. But we can get the same 

DA and have two completely different runs. This is due to humidity factor. Although the DA might be the 

same, you can have a different temperature and humidity combination. For every 15% increase in humidity 

our car’s performance will decrease .01 in elapsed time and for every 15% decrease in humidity our car’s 

performance will increase .01 in performance.
I’ve seen a lot of high dollar weather units on the market, yours is so inexpensive,  

can it really be accurate?

The  engineers  at  NK  have  been  working  on  the  Kestrel’s  functionality  for  over  ten  years,  and  have  been 

awarded  four  patents  on  their  innovative  engineering.  Additionally,  each  and  every  Kestrel  is  calibrated 

against  NIST-traceable  standards,  and  can  be  recalibrated  in  the  field  or  factory. We’re  so  sure  of  Kestrel 

Meter’s functionality that we guarantee each Kestrel for five-years, and each one comes with a Certificate of 

Conformity. Visit www.kestrelweather.com for detailed specifications.
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  firmly 

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 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  over  the  sensors  is  necessary  to  measure 

accurate temperature and humidity readings. You can ensure airflow by either placing the Kestrel Meter in a 

breeze, or by waving it back and forth. If no airflow can be provided, you must allow up to 20 minutes for the 

values to stabilize and accurate readings to be displayed.
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 -49.0 to 257.0°F 

(-45.0 to 125.0°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 specified 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 airflow 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 different 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.

Содержание 4250

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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