Dave compares the FFT modes on 7 different oscilloscopes:
Rohde & Schwarz HMO1202 Series
Tektronix MDO3000
Keysight 3000X Touch
Lecroy WaveJet 354 Touch
GW Instek GDS-1104B
Rigol DS1054Z
Rigol DS2000
Which is the best?

Checking the Rohde & Schwarz RTB2000 and other scopes for pulse recovery response.

00:00 – RTB2000 pulse response
02:48 – Rigol HDO4000
04:37 – Keysight 3000
05:20 – Tektronix 2 Series
08:12 – Tek 2 Series Autoset quirk
09:41 – Siglent SDS2000X
10:11 – Uni-T UPO3000E

https://www.eevblog.com/forum/testgear/new-killer-scope-a-true-game-changer-from-rs-rtb2002-rtb2004/msg4439797/#msg4439797

Hello, everyone. This is Colin from Fiber Optics For Sale.

In this video, I will explain what is jitter in fiber optic telecom systems, why jitter is bad, what causes jitter, and three types of jitter testing. So let’s get started.

What is jitter? Let’s look at this illustration first.

The solid line signal is the ideal clock. It has a perfect period. The dashed line signal is jittered clock. We can see that the rising edges of the jittered clock have a displacement from the ideal clock. The timing difference is marked as J1, J2, J3, J4, and J5. This phenomenon of timing displacement from its ideal position is called jitter.

The amount of jitter varies periodically. The jitter period is the interval between two times of maximum effect or minimum effect. Jitter frequency is jitter period’s inverse.

According to ITU-T G.810, jitter frequencies below 10 Hz is called wander, and at and above 10 Hz is called jitter.

The bottom figure shows the plot of the relative displacement versus time, this is called the jitter’s time function.

So why is jitter bad for a fiber optic communication system?

Here is an eye diagram that shows the distortions caused by jitter.

In order to accurately determine whether a given bit is a one or a zero, the signal should be sampled at the point where the vertical eye opening is maximum. This decision point is set by the recovered clock signal from the data bits.

But a jitter causes this decision point to move away from the maximum eye opening point. So the decision of a one or zero can be wrong if the jitter is too big. This causes bit errors and degrades the performance of a transmission system.

Jitters can be roughly categorized into two types — random jitter and systematic jitter.

Random jitter comes from the noise generated by the electronic components in telecom equipment. Random jitter is independent of the transmitted data pattern.

Systematic jitter is dependent on the transmitted data pattern. They are caused by the finite Q of the clock recovery circuit and its relationship to the transmitted data spectrum.

SONET and SDH standards specify the jitter requirements at the optical interface.

The transmission equipment jitter specifications are organized into three categories — Maximum Tolerable Jitter, Jitter Transfer Function and Jitter Generation.

What is jitter and how should you troubleshoot it?

What is jitter? In this episode of Scopes University, we continue our conversation from the previous InfiniiVision episode where we discussed How to Set Up Eye Diagrams (episode 3):
https://youtu.be/mnugUjaMN70

Today, you’ll learn about what jitter is, what causes it, why jitter is bad, and the basics of troubleshooting it on an oscilloscope.

First, you’ll gain an understanding of what jitter is: the deviation from where an edge crossing actually ends up compared to where it ideally should be.

Next, we’ll discuss some of the causes of jitter. Jitter can be caused by components on your board (deterministic jitter) or by uncontrollable random noise (random jitter).

Then, you’ll learn why you should care about jitter and why you should measure it on an oscilloscope. If you have too much jitter in your signal, it will cause errors in the data you transmit.

Lastly, you will get a firsthand look at the jitter analysis tool on the oscilloscope. You’ll learn how to use the capabilities to identify what it is that’s causing the jitter, as well as what you can do to fix it.

By the end of the episode you will understand how to measure jitter with a scope quickly and easily.

#141: What is an Eye Pattern on an Oscilloscope – A Tutorial
https://www.youtube.com/watch?v=cL7QsELuv_M