Mount the camera to the torch and use the camera cable to connect the camera to the controller. To see the image, connect a large format monitor (i.e. HDMI monitor) or a laptop to the controller. Check that the camera is in focus and start welding!
If you are using the zoom lens and LED, mount this assembly to the bench and power up the LED. The LED provides a bright image when welding is off.
The torch mount allows for a close-up image at almost any viewing angle. This is the principal advantage of the MeltView APEX3 camera over other welding cameras. The torch mount is not suitable for imaging SMAW, since the stick is consumed during welding, so the bench mount with zoom lens is used to capture video of SMAW.