When I started using my first {home-made} zapper, my husband observed me holding the copper bars and peering at a timer near-by. His off-the-cuff assesment was "How is that going to help if you don't tap it?" He's an electrician. Sooooooo, for several weeks and tapped one of the copper bars. It was difficult because I was so ill. I DID get results and eventually showed my husband that a chip was included that does the 'tapping' for me. LOL
What I'm getting at is -- I believe the tapping will work. It's the cheapest way to test electronic medicine.