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including peak wind speed, wind direction variation, hourly temperature change,
maximum and minimum daily temperature, barometric pressure change, maximum and
minimum daily pressure, relative humidity change, and daily and monthly precipitation
accumulation.
1.3 Data Logging
The time interval between recordings is user determined for periods ranging from one
minute to sixty minutes. This logged data can be retrieved for viewing or permanent
storage using the options available on the main menu.
When retrieved for viewing, the logged data is displayed as date and time stamped,
single line, row and column entries. Logged data can be retrieved in either hourly or
daily blocks.
For permanent storage, the data logged by the WS-16-A can be copied to a computer
hard drive or external media. The coma delimited format of the logged data has been
designed to be compatible with most commercial spreadsheet software (Excel, Lotus
1-2-3, OpenOffice.org, and Quattro Pro, among others).
1.4 Data Acquisition Module
The heart of the WS-16-A is the data acquisition module. It conditions and processes
the signals generated by the attached sensors and outputs them via the RS232
interface at a default rate of 9600 bits per second. Other bit rates are user selectable.
In addition to the RS232 interface connector, the data acquisition module provides
connections for all of the weather sensors.
Power is provided by an external 12Vdc source and the WS-16-A comes equipped with
a 12Vdc wall transformer for powering the station from a standard 110Vac outlet. (An
optional 220vac transformer is available.) A 12Vdc battery can be used to provide
emergency power in the event of a loss of main power. See section 2.2.
1.5 Sensors
The standard WS-16 sensors have been designed to be rugged, compact, and
lightweight. They interface directly to the data acquisition module without the need for
additional signal conditioning.
1.5.1 Wind Speed and Direction
The wind sensor combines a three-cup anemometer and a wind vane on a single axis.
The anemometer is a contact-type wind sensor which, when rotated by the wind,
triggers a series of momentary switch closures that are directly related to wind speed.
The wind vane uses a potentiometer to sense direction changes. Depending on the
position of the potentiometer wiper, an analog voltage is output that corresponds to the
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