Al,
The specific issue is : Video Toaster User, January 1994
Article: ABC's of Video Part V
By Rick Lehtinen
specific text is on page 58 under the Topic "Setting Horizontal Timing" middle
column.
Paragraph begins….
"Again, when doing timing measurements, the waveform monitor must be
externally referenced, that is genlocked, to something besides the signals it
is testing."…
Rocky