OmniScope can monitor signal in both Video (legal) and Full (data) range. To get accurate readings, the signal range settings must match between your source application and OmniScope.
In DaVinci Resolve, go to Monitoring settings where Data levels can be set to Video or Full. When set to Video, you can also enable Retain sub-black and super-white data to monitor signal outside of the legal range.
To make sure the signal is displayed correctly in OmniScope, open Input Settings (from the Connect menu or the gear icon in the toolbar, then the Settings tab):
Scale signal setting in Input Settings
Signal range in Preferences
The key setting is Expect video range. If Data levels in Resolve's Monitoring Settings is set to Video, then Expect video range should be enabled here.
To monitor out-of-gamut values (outside legal range), make sure Retain sub-black and super-white data is enabled in Resolve's Monitoring settings, and uncheck Scale the video/SDI range to the full range in OmniScope (Options / Preferences / Signal). Otherwise out-of-gamut values will be clipped.
