USER MANUAL
42
| HCO-3931
3.4.6 The Timing panel
NOTE: this panel is only available when the Clean Switch Enable checkbox is selected in the Switch panel (see
section 3.4.2
- The Switch Control panel on page 22
The PGM output timing, with respect to a detected reference, is programmable from -2 to +2 video lines with
programmable increments of -2, -1, -½, 0, +½, +1, or +2 lines.
In order for no input timing errors to occur, the input source must be synchronized and phased within a pre-defined 2
video line window. The start and end of the window precedes the user-programmed card output timing. To
compensate for the card’s minimum processing delay, a 500 pixels dead zone area is at the end of this window. The
recommended practice is to set the output timing so that the input timing falls in the middle area of the 2 line buffer.
The timing panel graphic shows the inputs (
MAIN
,
BACKUP
,
EMERGENCY 1
,
EMERGENCY 2
) and the output
(
PROGRAM
) phase relationship (represented by a black diamond marker) with respect to the
card’s reference
(reperesented by a yellow verticle bar). If the measured input timing remains within the supported input range window
(within the green REF area), the timing measurement will remain green. If not, the measurement will turn red (take
corrective actions such as changing the
PROGRAM Timing
setting).
Figure 25
Timing panel
Property
Description
PROGRAM
Timing
Use the
Vertical
pulldown to offset the output from the reference by a number of video lines.
