Night Owl NODVR108-500GB - Manual (Page 29)

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12.5 Video Setup Menu
Use the Video Setup Menu to set the camera system, monitor resolution,
and volume on the DVR.
To access the Video Setup Menu select System from the Main Menu, and
then select Advanced from the System menu, then select Video from the
Advanced menu.

Monitor Resolution: The larger the number the better resolution
will be displayed on your TV or monitor. Refer to your TV/monitor
manual for which resolution works best.

Camera System:
This option shouldn’t need to be adjusted unless
you have a PAL television.

Volume Setup: This will display the volume of the DVR.
Do not set the Camera System to PAL unless you have a PAL
television! This will disable the viewing of the DVR system.
Chapter 12 System Menu