JAI RMC-4200GE User Manual

Contents

JAI RMC-4200GE User Manual Manual pdf 14 page image

RM/TM-4200GE Series14 Installationsupport a 2A to 2.5A in-rush current for approximately 200μs to prevent the voltage at the camera fromdropping below the 10.8V minimum required. Dropping below this will result in the camera’s internalpower supply lowering its impedance in an attempt to draw more current. Since no more current will beavailable, the voltage at the camera will drop instead. This will result in a steady state hang-up whichwill damage the camera’s power supply and cause the camera to cease operating or to operate in anunstable manner.2.2.4 Attaching the Camera LensThe TM-4200GE camera accepts 1.2-inch or larger format size C-mount lenses. To attach the C-mount lens 3 tothe camera, carefully engage the threads and rotate the lens clockwise until it firmly seats on the mountingring. Do not force the lens if it does not seat properly. Some lenses with extremely long flange backs mayexceed the mounting depth of the camera.2.2.5 Adjustable Back-FocusBefore cameras are shipped, back focus is carefully set using a collimator, oscilloscope and other specializedequipment. While the factory-set focus serves well in most cases, an adjustable back focus makes it possible toimprove image sharpness when using lower-cost zoom lenses, custom optics, or in unusual parameters.There should be an obvious need to refocus the lens before attempting to change the back focus. This is a veryexacting task. Some cameras have been returned to the factory to reset the back focus after failed attempts tochange the focus by customers. It might be wise to label cameras whose back focus was adjusted.1. The camera must be connected to a monitor before attempting to adjust the back focus.2. To back focus the camera, first attach a C-mount lens in the mount. Be certain that the lens is properlyseated.3. Next set the lens focus to infinity (if the lens is a manual iris, set the iris to a high f number while stillretaining a well illuminated image).4. Loosen the three miniature hex set-screws (use a 0.9 mm hex wrench) that lock the focus ring in place(two screws for a CS-mount). Slowly turn the lens and focus ring assembly back and forth until you obtainthe best image of the desired object. This sets the back focus. Once the best image is obtained, tightenthe focus ring set-screws until they are snug. Do not over-tighten the screws.Note: Mini-bayonet cameras adapted to C-mount do not have the back focus feature.Figure 4. Back-Focus Set-Screw Locations3 C-mount to F-mount and C-mount to K-mount adapters are available for larger format lenses (35mm). Check with local photographydealers for these lens adapters.