FAQs from Rohde & Schwarz

RTE/RTO/RTP - Zoom shows ringing effects

Description

When I use the zoom function to look at the rising edge of a rectangle signal, I see ringing which is not real, see screenshot. What is the reason?

RTE/RTO/RTP - Zoom shows ringing effects - screen 1

Resolution

The effect is caused by the sinus(x)/x function, which is used for the optical zoom function.
As a remedy use the hardware zoom:

RTE/RTO/RTP - Zoom shows ringing effects - screen 2