JDC Skywatch 1.2-93 MPH SkyWatch Cup Style Wind Meter User Manual
- June 16, 2024
- JDC Skywatch
Table of Contents
User manual
1.2-93 MPH SkyWatch Cup Style Wind Meter
You have just acquired a piece of high precision equipment which has been created using the most modern technology. It has been designed to stand up to intensive use. However, in order to maintain its appearance and its precision, we recommend that you treat it with care and read this manual carefully.
Function of the buttons
| ON: press 1 second
OFF: press 2 seconds (non auto off)
LIGHT: press on and off briefly
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| UP: setting mode
START / STOP: chronometer mode
| DOWN: setting mode
LAP / RESET: chronometer mode
| SET / CAL: setting mode
| RESET MEMORY: press 3 seconds
Configuration
To access the confi guration mode of your instrument, just press on the
button. Pressing the button once again cause the system to confi rm the
setting if there has been a change. If not then it goes to the next setting.
To modify the settings the and buttons have to be used. Here is how to
proceed with the different instrument settings.
Wind measuring unit
The units to be selected are: mph, knots, km/h, m/s, fps and Beaufort. Once
the unit is chosen, it remains displayed in the top right. If no unit is
displayed the instrument is set to Beaufort.
Temperature measurement unit
The units to be selected are: °F, °C, °F , °C , °F and °C .
Humidity measurement unit
Humidity is displayed in a single unit: %rH.
Setting the time of the average
The times to be selected are: — (weighting), 3’’, 6’’, 12’’, 30’’, 1’, 6’,
30’, 1:00’, 6:00’, 12:00’, 24:00’ or timer .
The Timer mode is used to measure the average, min. and max. over a defined
period of time between a start (press ) and stop (press ). This time is
displayed on the bottom line. This timer allows the use of the LapTime
function (press , the symbol flashes). The button also allows the timer to be
reset to zero. This works in the same way as a standard chronometer.
Setting the display of wind, temperature and humidity.
The displays to be selected are: —, MIN, AV, MAX.
When MIN is selected, only the temperature and humidity are concerned, the
wind continues to display the instantaneous value (—).
When the selected unit is °F or °C , the display setting is limited to — or
MIN.
Wind measurement (upper display)
Important: the protective cap has to be removed from the instrument in order
to rotate the impeller.
The impeller has a maximum sensitivity in the vertical position (due to its
magnetic levitation), and an optimised precision when its axis of rotation is
perpendicular to the wind direction.
The average or maximum wind speed is calculated based on the time of the
average. These values are reset to zero during a RESET of the memory.
Temperature measurement (bottom display)
Instantaneous temperature
Important: Thermal inertia of the instrument directly affects the
stabilisation time of the measurement. The greater the temperature difference
is the longer this time will be. This time will be shorter if the wind speed
is higher.
Wind-chill temperature
As you know, exposure to low temperatures is potentially dangerous to the
human body. But did you know that wind plays a significant part in how your
body actually feels temperatures? For example, an ambient temperature of 0°C
and a 30 km/h wind have the same effect on you as a temperature of -13°C! The
result of the calculation of the effect of wind on the temperature is called
the “wind-chill temperature”. By the sea, in the mountains, hiking or cycling,
the 
shows immediately the temperature felt by the body
and warns of risks of chilblains and hypothermia.
Min and max temperature
These two modes show the min or max values measured over time of the average.
The value is reset to zero during a RESET of the memory.
Dew point
The dew point (°F and °C ) is calculated taking into account the humidity and
the ambient temperature.
It gives the temperature at which the water vapour contained in the air has
reached saturation point (formation of clouds, fog, dew, condensation on
objects, etc.).
Example: At an ambient temperature of 23°C and a humidity of 39.5% rH, the dew
point is 12°C.
Humidity measurement (middle display)
Instantaneous humidity
Ambient humidity depends on the temperature. When moving the instrument from a
warm environment to a cold environment, the values measured will vary. In the
atmosphere, humidity is not uniform, and two locations that are close to each
other may give different results.
A person perspiring and/or breathing very near the instrument may impact on
the measurement.
Minimum humidity, maximum humidity
These two modes show the min or max values measured over time of the average.
The value is reset to zero during a RESET of the memory.
Technical data
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Backlight
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Sealed and weatherproof instrument
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Thread on the bottom of the instrument for fi xing to a tripod (1/4’’)
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Anemometer precision: ± 3% (10 to 150 km/h), depending on its orientation in the wind
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Anemometer resolution: 0.1 to 99.9, then 1 unit
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Anemometer measuring range: 2 to 150 km/h
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Thermometer precision: ± 1°F (at 77°F)
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Thermometer resolution: 0.1 unit
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Thermometer measuring range: -4 to +158°F
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Hygrometer precision: ± 3% (20 to 80%rH)
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Hygrometer resolution: 0.1
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Hygrometer measuring range: 2 to 100%rH
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Power supply: 2 batteries, 1.5V AA Battery lifetime, at least 3 years with occasional use of the display backlight.
Low bat indicator. To replace, loosen the three screws on the metal plate. -
Weight: 235 grams (insubmersible)
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Dimensions: ø65 X 155 mm
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Warranty: 1 year
JDC Electronic SA
Avenue des Sports 42
1400 Yverdon-les-Bains
Switzerland
Phone: +41 24 445 21 21
Fax: +41 24 445 21 23
Email: info@jdc.ch
Website : www.jdc.ch