INTELLINET NETWORK NSC15-WG User Manual - Manuale (Pagina 69)

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Iris:
Optional parameter, only available in cameras with a DC-
controlled auto-iris. This value should be set to auto to allow
the camera to adjust the iris in accordance with the current
light conditions for best results. The calibration function
should be performed from time to time to ensure proper
results.
If the light levels are too low, the calibration function will fail
and the message “Calibration Failed” is shown. This is normal.
Repeat the calibration when there is more light available.