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EEVblog 1445 - How to Simulate an Oscilloscope Probe in LTSPICE

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EEVblog:
How to simulate a x1 oscilloscope probe in LTSPICE.
And how to use the lossy transmission line model in practice with the spice directive.

Mysteries of x1 oscilloscope probes revealed:

radioing:
Hello Dave, thank you for nice video - good point with the Spice DC setting by big R to enable synthesis of 'floating' circuits.
Several years ago I found the Joe Weber's >100 pages document about
Tektronix osc. probes design from 1969 - 'Oscilloscope Probe Circuits'.
Not sure you saw/read it but anyway, even it's a little bit ancient, the theory holds and it's nice reading for anybody who's interested in.

EEVblog:

--- Quote from: radioing on December 23, 2021, 08:13:34 pm ---Several years ago I found the Joe Weber's >100 pages document about
Tektronix osc. probes design from 1969 - 'Oscilloscope Probe Circuits'.
Not sure you saw/read it but anyway, even it's a little bit ancient, the theory holds and it's nice reading for anybody who's interested in.

--- End quote ---

I haven't seen that, is there a PDF available?

Tom45:

--- Quote from: EEVblog on December 23, 2021, 11:27:12 pm ---I haven't seen that, is there a PDF available?

--- End quote ---

Search for TekProbeCircuits.pdf

It can be found at a number of places.

David Hess:
Oscilloscope probes are actually tested and specified with a 25 ohm source impedance from a parallel terminated 50 ohm source.  The probe tip adapter used for testing is driven from a 50 ohm generator and has a 50 ohm parallel termination built into it directly at the probe tip, like a 50 ohm feedthrough terminator.  So your bandwidth results are only half of what they should be.


--- Quote from: EEVblog on December 23, 2021, 11:27:12 pm ---
--- Quote from: radioing on December 23, 2021, 08:13:34 pm ---Several years ago I found the Joe Weber's >100 pages document about
Tektronix osc. probes design from 1969 - 'Oscilloscope Probe Circuits'.
Not sure you saw/read it but anyway, even it's a little bit ancient, the theory holds and it's nice reading for anybody who's interested in.
--- End quote ---

I haven't seen that, is there a PDF available?
--- End quote ---

Is there a PDF available.  Sheesh, only on days ending in "Y": (1)

https://w140.com/tekwiki/images/6/62/062-1146-00.pdf

(1) Yankee humor.

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