Grass Valley PDR v.2.1 - Manual (Page 104)

Chapter 3 Using VdrPanel
88 Profile Family
Setting Drop-Frame Timecode
In NTSC, you don't actually get 30 frames per second; the real number is about
29.97 fps. Timecode usually assumes 30 fps. To account for the discrepancy,
drop-frame timecode skips or drops two timecode values at the beginning of
every minute except every tenth minute. This allows timecode to exactly match
a real-time clock on 525/60 systems. This correction is not needed on 625/50
systems because the frame rate is exactly 50 fps.
To set drop-frame timecode:
• Choose Options | Drop-Frame or Options | Non-Drop-Frame .
NOTE: This setting applies to all open panels (channels).