Axis M3203 用户手册

The camera tampering application generates an alarm whenever the camera is repositioned, or when the lens is covered, 
sprayed, or severely defocused.

First, you must create an event, see How to set up a triggered event, on page 22, for the camera to send an alarm.

The 

Minimum duration parameter sets the minimum tampering period, that is, an alarm will not be triggered until this period 

has elapsed, even if the tampering conditions are otherwise met. This can help prevent false alarms for known conditions that 
affect the image. 

If the camera lens is sprayed or covered so that the camera live view becomes dark, it will not be possible to distinguish this 
situation from other situations where the same effect is seen, such as when lighting conditions change. When the 

dark images parameter is enabled, alarms are generated for all cases where the lights are either dimmed or turned off, or if 
the lens is sprayed, covered, or rendered severely out of focus. If not enabled, no alarm is sent. 

After you define these settings, click 

Save.