EEVblog 1718 - Cheap 1GHz Oscilloscopes are Useless? ($5 DIY 1GHz Resistive Probe)

Video Description

What use is a 1GHz oscilloscope if it doesn't have a high frequency active probe interface? Well, there are several options including a cheap $5 DIY resistive probe. Practical demonstration of active FET probing vs Passive Probing vs DIY Resistive probing. A lot of material extracted from videos 1367 and 1368 https://www.youtube.com/watch?v=rzo4Ntxqu1E https://www.youtube.com/watch?v=WlSb8hdFtTY Forum: https://www.eevblog.com/forum/blog/eevblog-1718-is-a-cheap-1ghz-oscilloscope-useless-($5-diy-1ghz-resistive-prob/ 00:00 - What use is a cheap 1GHz oscilloscope if it doesn't have an active probe interface? 02:30 - Capacitive reactance and tip capacitance 03:55 - High bandwidth passive probes 04:59 - Active FET probes to the rescue, right? 07:54 - DIY $5 1GHz Resistive probe 09:02 - DIY resistive probe explained 13:33 - Active FET probe example: Poor Grounding vs Good Grounding 19:02 - $5 DIY Resistive probe vs $3k Active FET probe 19:48 - What's going on here? The downside of resistive probes. 21:10 - Resistive probes are more tolerant of grounding 25:08 - Conclusion Web Site: http://www.eevblog.com Hardware Store: https://eevblog.store/ Merch Store: https://eevblog.dashery.com/ If you find my videos useful you may consider supporting the EEVblog on Patreon: http://www.patreon.com/eevblog Other channels: EEVblog2: http://www.youtube.com/EEVblog2 EEVdiscover: https://www.youtube.com/eevdiscover #ElectronicsCreators #oscilloscope