Your aiming point and a shot hole do not enter the work area during the optical sensor’s calibration stage. There may be two possible explanations to why this problem manifests itself:
1-The distance to your electronic target is too short (All trainers are to be used on distances recommended by the manufacturer)
2-Optical sensor is not coaxially mounted in regards to the barrel.
Mounting prism has two different rim heights (denoted by the letters A and B). Side “A” is lower than side “B”. This design decision was made in order to compensate for the difference in elevation between the sights of weapons and the optical sensor. As a way to achieve a situation where the axis of sighting devices converge with the optical sensor’s axis in regards to the electronic target. This setup works only when the optical sensor is mounted under the weapon’s barrel.
If the optical sensor is mounted to the side of the barrel or the barrel has a conical shape, it may be required to insert a pad (“C”) under the rim of your mounting prism. Make sure that the optical sensor’s aiming point falls into the work area of the calibration window by manipulating the position and thickness of the pad.
If you are using optical sensor model WS-M02, you can rotate it inside the barrel or a clamp (depending on what kind of mounting is utilized) to slightly adjust the aiming point.
You also can use mounting prism with adjusting in order to offset parallax.