1. Uni-directional Waveforms - these waveforms are always positive or negative in nature flowing in one forward direction only as they do not cross the zero axis point. Common uni-directional waveforms include Square-wave timing signals, Clock pulses and Trigger pulses.
2. Bi-directional Waveforms - these waveforms are also called alternating waveforms as they alternate from a positive direction to a negative direction constantly crossing the zero axis point.
How does a tech know if the square waveform is a bi-directional square waveform?
The power supply is +12 and -12 volts