The Tektronix TSG12 Convergence Generator Plug-In provides high-quality convergence test signals for the 1411 PAL Generator Mainframe. You can use it to determine picture monitor or camera scanning linearity, aspect ratio, and geometric distortion. Provision is made for on/off switching of the dots, vertical lines, and/or horizontal lines and for positioning vertical and horizontal lines. A sync pulse generator must be installed in the mainframe for operation.