AJA FS2 - Manual (Page 174)

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Test Pattern
Video Test Pattern selects the video source for the Test Pattern Generator.
Freeze Output This parameter tells the FS2 to freeze the current video frame on all outputs. This
may be useful either for testing or in case of loss of the input source.
Note: The freeze feature can be controlled not only by the front-panel and web
browser interface, but also by a GPI input. When a GPI input is causing the freeze
condition, the EXT lamp will be lit on the front-panel.
(21) Test Pattern Video Selections Selection Descriptions
75% Bars (default)
Ramp
Multiburst
Flat Field
Black
100% Bars
Sets the test pattern to 75% bars.
Sets the test pattern to a ramp.
Sets the test pattern to multiburst.
Sets the test pattern to flat field chroma.
Sets the test pattern to black.
Sets the test pattern to 100% bars.
(22) Freeze Output Selections Selection Descriptions
Off (default)
On
Normal operation. The FS2 outputs video from the input.
The FS2 captures and freezes the most current video frame and displays
it on the outputs as long as this parameter is set to On.