If (on a DigiBeta DVW-A500 or similar) you enable menu item 105 – Ref Alarm – the stop lamp will flash under several conditions:
- The reference signal is solid and the input video is locked but there is more than 43 video lines offset between them – the a longer period than the VTR’s pre-read system will tolerate
- The reference signal is solid and the input video is unlocked
- The reference signal is solid and there is no input video and the deck is locked to video rather than ref
- There is no reference
Most folks assume it’s down to a loss of reference – that’s only the case in a minority of situations. I’ve been back and forth to one particular facility where they fail to understand this it’s getting tedious!