HEIDENHAIN PWM 20 - Manual (Page 197)

200 HEIDENHAIN ATS Software User's Manual
6.3.4 Level function
 Oscilloscope display, TTL
The image shows the start screen with three display fields; the reference mark trigger is active.
The coordinate axes show X = time in [ms] and Y = voltage in [V].
Display field 1 Ua1
Display field 2 Ua2
Display field 3 Ua0