Kestrel 3500 - Manual (Page 3)

Kestrel® 3500 Pocket Weather® Meter 5
5. Hold mode. While holding
MAX AVG
, press
MAX AVG
to hold the time and all of the measured values.
The word “HOLD” will blink to indicate the Hold Mode. Press
MAX AVG
or
MAX AVG
to view the other
measurements in Hold Mode. While holding
MAX AVG
, press
MAX AVG
to exit the Hold Mode. This
mode can be useful for taking measurements when unable to view the display.
6. Turn on the backlight. Press
MAX AVG
to activate the backlight for 10 seconds. If
MAX AVG
or
MAX AVG
are pressed while the backlight is illuminated, the backlight will remain illuminated for
another 10 seconds. Press
MAX AVG
while the backlight is illuminated to manually turn off the
backlight.
7. Adjust the clock. Simultaneously press
MAX AVG
and
MAX AVG
to adjust the clock. While the clock is
blinking, press
MAX AVG
or
MAX AVG
to adjust the clock. Hold
MAX AVG
or
MAX AVG
to adjust the times quickly.
Simultaneously press
MAX AVG
and
MAX AVG
to exit the clock adjustment.
8. Turn off. Hold
MAX AVG
for 2 seconds to manually turn off the unit. The unit will automatically
turn off if no buttons have been pressed for 45 minutes.
UNDERSTANDING THE MEASUREMENTS
Wind Speed - average over the previous three seconds. The measurement will be accurate
for air flow through the front or rear of the unit.
Maximum Wind Gust - maximum 3 - second wind speed since the unit was turned on.
Average Wind Speed - average wind speed since the unit was turned on.
Temperature - instantaneous temperature of the thermistor, which is located at the end
of the long coiled leads in the open cavity below the impeller. The exposed thermistor will
respond quickly to changes in temperature when air flows past it. For fastest response, either
hold the unit into the wind or wave the unit side to side for 15 seconds. Readings should be
taken in the shade. Water and snow temperatures can be taken by hold the unit in the water
or snow.
Wind Chill - combination of wind speed and temperature, as defined by the US National
Weather Service. Wind chill is the effective temperature on a human or animal at low
temperatures due to wind speed. Wind chill readings will be the same as the temperature
readings above 45ºF or below 3 mph.
Relative Humidity - amount of moisture in the air compared to the amount of moisture the
air can hold for the given temperature, represented as a percent. Because relative humidity is
also a function of the temperature, the response time will be dependent on the temperature
response time (see temperature section above). Readings should be taken in the shade.
Heat Stress – combination of temperature and humidity, as defined by the US National
Weather Service. Heat stress is the effective temperature on a human or animal at high
temperatures due to humidity. Heat stress readings will be the same as the temperature
readings below 70ºF.
Dewpoint – calculated based on temperature and humidity measurements, as a measure of
moisture content in the air. If the dewpoint is very close to the temperature, the air is humid.
If the temperature and dewpoint are the same, dew will form. If this happens below freezing,
frost will form.
Wet Bulb Temperature - calculated based on temperature and humidity measurements, as a
measure of evaporation rate. If the wet bulb temperature is very close to the air temperature,
the air is humid. Wet bulb temperature is typically measured by swinging a mercury
thermometer with a wet sock on its end for several minutes.