Clamp; Coast - Rutter VDR-100G3 Installation Manual

To fine tune the Gain and Offset using the Master Gain and Offset scroll buttons:
Adjusting Gain stretches the image vertically in the Capture window.
1. Click on the Master Gain scroll button to adjust the Gain of the entire image—instead of
the individual Red, Green and Blue values. (The range is 0 to 255).
2. Click on the Master Offset scroll button to adjust the Offset of the entire image—instead
of the individual Red, Green and Blue values. (The range is 0 to 255). Adjusting the offset
shifts the image up and down in the Capture window.
Figure 9-24 – Clamp and Coast sections of the Adjustments tab page.
9.5.4.3

Clamp

At the lower left of the Adjustments page is the Clamp section. It allows the installer to enable or
disable the video capture HSync signal default. The Clamp controls are necessary so the installer
can enable VSYNC signal capture if there is no HSYNC signal.
Enable (Use HSYNC) check button: In the absence of a VSYNC signal, the video capture
circuitry will use the HSYNC signal. This is the Clamp command default setting.
Disable (Positive) check button: The Disable (Positive) setting overrides the HSYNC signal
and disables the Clamp command.
Placement [0 – 255] and Duration [0 – 255] scroll boxes: These scroll boxes are only
active if the Enable (Use HSync) check box is selected. They allow for the sampling of video
to determine voltage corresponding to the image's black levels.
9.5.4.4

Coast

In the absence of a VSYNC signal, it may be necessary for the circuitry to obtain the HSYNC
signal.
Checked: In the absence of an HSYNC signal, the video capture circuitry will use the VSYNC
signal.
Unchecked: This setting overrides the usage of the VSYNC signal and, effectively, disables
the "Coast" command.
VDR-100G3/G3S Installation Manual
Chapter 9: Video Module, Rev. 1.2
9-24
06/10/2008