How to measure DC power rail high bandwidth waveforms with the offset control on your oscilloscope. Active Probes, Passive Probes, Z0 probes, and specific DC Power Rail Probes are compared.

00:00 – How to measure power rails with Active Probes and Power Rail probes
08:03 – Signal Skew
09:54 – 10:1 Passive Probe
10:18 – Example of an 8 bit scope with no offset adjust
10:39 – Trap for young players. Input referred offset.
12:41 – Cheap DIY Z0 Probe
14:41 – Offset range changes based on V/div, don’t be fooled.
16:48 – Rigol Scopes
17:20 – Siglent Scopes & How models differ
18:53 – Why the complete opposite between Keysight/R&S and Rigol/Siglent?

PRP1: https://www.eevblog.com/forum/testgear/prp1-low-cost-2ghz-power-rail-probe/
Power Rail Probe DIY project in Silicon Chip:
https://www.siliconchip.com.au/Issue/SC/2025/November

Forum: https://www.eevblog.com/forum/blog/eevblog-1735-oscilloscope-dc-offset-explained/

Podcast: Download