A positive offset output means the output is direct current (DC) but in this case has frequencies imposed on it so it is a combination of a DC and a frequency output. Beck had experimented with DC and when applied to the arteries he said it "wrecked the blood". I also experimented with it and it did wreck my blood. After a couple months of daily DC blood electrification I thought I was going to die it made me so sick. That is why Beck switched to an alternating current (AC) output at 4 hertz frequency. All his successes were doing that. Beck had experimented with every type of electromedicine device and said that both the Clark and the Rife devices "did not work". I found the same to be true. I started my business back in '96 selling them and quit for lack of good customer feedback. I refuse to sell weak devices which is why I went mostly to the Beck devices because they definitely work. Clark was an obvious fraud and the "Rife" machines are not anything like the original Rife machines. And the "Rife" frequencies are not from Rife. About 10 of them were from Crane. All the rest are from any Tom, Dick, and Harry that said they thought they worked against such-and-such disease without any real proof. Yes the MY3 is the best Zapper, not because it is effective, but because it is fancy and complicated and tricks the fools into thinking that it must be good. Clark Zappers are fraudulent devices for fools who want to quickly part with their money. So are Rife devices. please read http://www.dragonfly75.com/eng/thiel.html Syyenergy7 is down on Beck blood electrification devices because they didn't cure his AIDS although Beck reported cures. I believe if you start soon after getting AIDS that blood electrification can keep it in check but syyenergy7 started late. Now he keeps the viral count down by using three anti-AIDS drugs, not by using the MY3. I know because we had many emails exchanged. He is well intended but has false hopes in this device.