Grass Valley PDR v.2.1 - Manual (Page 34)

Chapter 2 Using the Profile Configuration Manager
18 Profile Family
4. Click Close to accept the settings, Undo to return to the previous settings,
Default to return to the default settings.
NOTE: You must restart your unit for the new system timing setting
to take effect.
You can also fine tune your system timing settings individually under
Reference Genlock System Input Advanced Adjustment in the Reference
Genlock dialog box. You can also tune individual output settings under Output
Timing Adjustment in under Video Output.
Figure 10. System Timing dialog box, zero-timed