WS6 O2sensor on vehicle

Toyota soarer 1994

On the vehicle I tested the oxygen sensor was located on the exhaust manifold. The oxygen sensor has one black wire which is a signal wire. The oxygen sensor is a zirconia switching sensor. I back probed the Oxygen sensor and attached an oscilloscope and got a signal. When revving the vehicle at 2500rpm the signal voltage reached 1volt and the lowest was 0.03volts. It has 9 cross counts. Its cycling normally.