Hi Alexandre and friends,
The connection I made is as follows:
1. From HP8924c video out (BNC) to GBS8200 Y-video in (RCA) with BNC cable and BNC to RCA adapter
2. From GBS8200 VGA out to Samsung Monitor/TV VGA/PC input with standard VGA cable
3. The GBS8200 is set o YPbPr mode.
As it is shown in the photos I uploaded, it works almost well, for practical purposes, but the display is offset to the left, missing three text columns. (Maybe this will be corrected with the sync separator).
Thank you for the nice work and leading us to a solution!
Best R
Yiannis
SV1MNE