4.6 Recommendations

A microprocessor-based digital data acquisition system should be used as the primary data recording system; analog data recording systems may be used as a backup. Wind speed and wind direction analog recording systems should employ continuous-trace strip-charts; other variables may be recorded on multi point charts. The analog charts used for backup should provide adequate resolution to achieve the system accuracies recommended in Section 5.1. Estimates of means should be based on at least 60 samples (one sample per minute for an hourly mean ).

Estimates of the variance should be based on at least 360 samples (six samples per minute for an hourly variance). If single-pass processing is used to calculate the mean scalar wind direction then the output from the wind vane should be sampled at least once per second.

4. METEOROLOGICAL DATA RECORDING
 4.1 Signal Conditioning 
 4.2 Recording Mechanisms 
 4.3 Analog-to-Digital Conversion 
 4.4 Data Communication 
 4.5 Sampling Rates 
 4.6 Recommendations