Appendix F: Methods and Calculation Details
X-320M™ User's Manual
to polar coordinates and returned as the average Wind Direction. This method, along with some minor
adjustments based on the quadrant measurement, is used to handle averaging the Wind Directions that
vary around the 360 degree range. Otherwise, the average of 10 degrees and 350 degrees would be
give an incorrect average of 180 degrees, instead of the correct average of 360 degrees.
Rain
X-320M™ keeps track of rainfall using the input to count bucket tips in a rain collector.
The 1 Hr Rainfall reflects the rainfall for the previous 60 minutes. This value is updated every 4 minutes.
The 24 Hr field indicates the amount of rainfall that has occurred in the previous 24-hours. This value is
updated every 4 minutes.
The Previous 7 Days field shows rainfall that has accumulated over the last 7 days. It is updated daily at
midnight.
Total Rainfall indicates how much rain has fallen since the counters were last reset. This value is
updated with every bucket tip. The counters can be reset to 0 on the
Status Page.
Note: Reset causes all Rainfall values to return to zero, including 1 Hr, 24 Hr, 7 Days, and Total.
Temperature
The Temperature reading is the instantaneous reading. No averaging is done. The current high/lows are
initially set to the current temperature on power-up. The daily high and low temperatures are updated
every 2 seconds.
At the beginning of a new day (0000:01 hrs), the “Today” high/lows are set to the “Yesterday” high/lows.
The “Today” high/lows are set to the current Temperature reading.
Humidity
The Humidity reading is the instantaneous reading. No averaging is done. The current high/lows are
initially set to the current humidity on power-up. The daily high and low humidity are updated every 2
seconds.
At the beginning of a new day (0000:01 hrs), the “Today” high/lows are set to the “Yeserday” high/lows.
The “Today” high/lows are set to the current Humidity reading.
Solar Radiation
The Solar Radiation measurement is sampled once per minute. An Avg. Period setting of 1 min. will give
an instantaneous reading. The maximum average period is 60 minutes. The new measurements replace
the oldest reading.
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