Oscilloscope Probe Fundamentals

This video explains the basics of oscilloscope probes, including the most common probe types as well as explain how to choose an appropriate probe for a given measurement application.

Timeline:
00:00 Introduction
01:03 About probes
02:03 About probe bandwidth
02:56 About probe loading
03:53 Choosing the channel impedance / termination
05:28 Passive probes
06:20 Attenuation in passive probes
07:21 Configuring probe attenuation
08:08 Switchable probes
08:46 1X probes
09:37 10X probes
10:36 Importance of a short ground connection
11:39 Compensating passive probes
12:16 Why is probe compensation necessary?
13:19 How are probes compensated?
14:07 Probe compensation examples
14:55 Measuring current with an oscilloscope
16:11 About (clamping) current probes
16:48 Measuring AC and/or DC probes
17:28 Current probe parameters
18:41 Connecting to the oscilloscope
19:38 Connecting to the circuit under test
20:17 Multiple loops for increased current sensitivity
21:09 Zeroing current probes
22:11 Demagnetization / degauss
23:16 Deskew
24:37 About single-ended measurements
25:50 About differential measurements
26:38 Two ways of measuring differential voltages
27:01 Two single-ended probes (quasi-differential)
27:50 Differential probes
28:48 Aside: twisting differential probe leads
29:25 Advantages and disadvantages of differential probes
30:35 Differential probe specifications
31:00 Common mode rejection ratio (CMRR)
32:10 Differential mode range (DMR)
33:29 Common mode range (CMR)
34:36 What do we mean by an “active” probe?
35:22 About active probes
36:18 Using active probes
37:08 Characteristics of active probes
37:30 Active probes and loading
38:27 Active probes and bandwidth
39:18 About offset range
40:40 Active probes and offset range
41:30 Summary

[amaechinwankwo]

I noticed that in your previous video ZNB3000 - Compression Measurements, Gain measured with respect to Input Power gives the Compression Point at a 1 dB interception point while in this video, the interception point for Bandwidth when measuring Amplitude versus Frequency is 3 dB. Why is one 1 dB while the other is 3 dB?