Welch Allyn RL-100 Rhinolaryngoscope - User Manual - Manual (Page 5)

MONITOR
FRONT VIEW
VIDEO INPUT - LINES “A” AND “B”
Input lines “A” and “B” correspond to the composite (NTSC)
inputs on the back of the monitor. Depending upon which video
input “line” the VTR is coupled to on the back of the monitor, the
corresponding “line” button on the front of the monitor must be
depressed to view a recorded image. For example, if the coaxial
cable out of the VTR is coupled to the VIDEO IN connector under
LINE A, then the Line “A’ input button must be depressed to view
an image.
VIDEO INPUT - LINE "C" Y/C & VTR
This video input will display S-VHS video. In endoscopic applica-
tions it is this button that will be depressed to view a live image.
This is desirable due to the higher resolution that S-VHS video will
provide. If you have a VTR that is S-VHS compatible then this
button will always be depressed when viewing a live or recorded
image. In this case the video connections will run from the camera
control unit to the VTR to the Monitor.