Jef,
The 3D is what I call my detectors that I have upgraded to a Triple Discrimination system. The stock discrimination pot (knob) works exactly as on any other Tesoro. The toggle adds two set discrimination points. The detector works perfectly, avoiding pull tabs and still responding to targets in the nickels range and in the coin range. So the operator has the choice to operate in the stock configuration, or utilize a 3 level Discrimination.
THE PURPOSE OF THE MODIFICATION:
I added a 3 position momentary switch that returns to the center position when not activated.
1. First I set the detector to discriminate out foil. This is the center and default setting of the toggle.
2. Pressing down the toggle activates the Nickel and below discrimination. When released the toggle pops back to the center position.
3. Pressing up on the toggle activates the Zing and below discrimination. Again, when released the toggle pops back to the center position.
SO THIS HOW IT WORKS:
1. The first signal means a target above foil is under the coil.
2. Press down on the toggle. If the signal goes away chances are the target is a Nickel, Can Slaw or a Gold Ring.
3. If the signal did not go away Press the toggle up. If the signal does not go away its probably a non-zinc coin or silver. If it did go away its probably a pull top or zinc.