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EEVblog 1718 – Cheap 1GHz Oscilloscopes are Useless? ($5 DIY 1GHz Resistive Probe)
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
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
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By David L. Jones
4.6
7979 ratings
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
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
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