6. Push Autoset.
The screen displays a square wave.
7. Check the shape of the displayed waveform to determine if the probe needs
adjusted. If the waveform has a square leading edge and a flat top and
bottom, the probe does not need adjusted.
If the waveform leading edge is rounded or has a spike, you need to adjust the
probe compensation.
Getting acquainted with the oscilloscope
30 TBS2000B Series Oscilloscopes User Manual