Teil C - Annex 
75 
9 2*9 2 2 2 1*2 S 43 LS 2 2 9 
SE SC S SWENWSWSS 
Dale 
Mean Wind Strength (Bft) 
Mean Wind Direction 
Figure 13: Evaluation of bat activity over the course of the survey period. 
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Figure 14: Blending of wind data with bat activity. 
Quality assurance 
The equipment must be maintained in manner to ensure failure-free operation: 
• Maintenance and calibration of microphones and detector system must be carried out once 
per survey year by the manufacturer If necessary, repairs are carried out by the manufac 
turer’s service department 
• Example calibration for the Avisoft system under: 
http://www.avisoft.com/lnbetriebnahme%20und%20Kalibrierung%20des%20WEA- 
Fledermausmonitoring-Systems.pdf 
• The minutes or reports documenting maintenance and repair work are collected in the 
“equipment log”.