Press <P> to specify the pixel from which you wish to begin your display, and then enter a
four-digit decimal value where the cursor appears. The ampersand (&) at the top of the screen
will represent this pixel.
Press <T> to choose between the three data sampling methods. The choices are "Single,"
which will take a sample when the space bar is pressed; "Auto," which will sample
continuously; and "Lock," which will lock on to a drifting object and keep it on the screen.
Press <S> to search for an event where the voltage level changes, as will occur when a change
in brightness or darkness is detected by the CCD camera. Press any key to abort the search.
Pressing <CTRL-A> will display the absolute pixel position, in hex notation, from the
beginning of the scan line.
The image on the screen represents 24 consecutive pixels at a time with the pixel number
increasing from the top of the screen to the bottom. The left side of the screen represents less
light; the further right, the more light. For total darkness, the digital output would be 00 in hex
notation. For total white, the digital value would be FF.
To view more pixels, use the "Up" arrow to scroll the display up and the "Down" arrow to
scroll down.
Press <X> to return to the Diagnostic Tests menu.
HELP: Press <H> to display help text on the screen. This text provides you with helpful
reminders about how to reply to the various screen prompts and details the choices available
for each option. Press any key to clear the help text from the screen.
Procedure for Adjusting the Camera Focus: The first four steps of this procedure -- as well
as the required equipment, tools, and materials -- are the same as for adjusting the
magnification of the camera.
NOTE: In practice, both the focus and magnification of a given camera should be set before
moving on to the next camera because of the need for precise placement of the Standard Target
Document. Since focus and magnification interact, it is necessary to check magnification
whenever the focus is changed.
The camera assembly is composed of the camera board, the camera block, the collar, and the
lens. The collar is held on to the camera block by a bracket held by two screws. The lens
screws onto the collar.
