STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[Omnibus]

Here are the data for many periods (can't post the Excel data -- file too big).

[Omnibus]

I'd like to understand how the compensation of the 10X probe works and what's different in its schematics compared to the 1X probe so that it can be modeled and overcome in the 10X case (that is, trying to do the opposite the 10X probe was designed to do). Couldn't find any such concrete information. It very well may be that it's proprietary. Apparently, the 1X probe induces favorable changes (favorable in terms of OU) in what the pulse generator supplies to the RC circuit, taking advantage of the natural asymmetry between I and V in terms of offset and providing a phase shift additional to what the C in the RC circuit provides naturally. That has to be understood well.

[Omnibus]

OK, here's what's happening when I try to model the 1X probe when using the 10X one:

[Omnibus]

Here's the same arrangement but now the probe is 1X (1X probe gives OU anyway). Now, isn't the impedance of the 1X probe made to match the impedance of the scope? If so, what is the 10X impedance matching? If the 1X probe's impedance isn't made to match the scope impedance what good is it?

[gyulasun]

@Omnibus

Here is a link on explaining the inside circuit of 1:1 and 10:1 scope probes:

http://zone.ni.com/devzone/cda/ph/p/id/17 

So it means the 1:1 probe does not do impedance matching, it acts as a piece of (coaxial-like) cable connected to the scope's input, (unfortunately it increases the original small input capacitance of the scope, to 115pF in your case from the 12-15pF? or so direct input capacitance).
Of course the original scope input resistance is 1MOhm, this does not change with 1:1 probes, except at increasing frequencies where the probe's higher input capacitance makes an increasing shunting, gradually decreasing
the 1MOhm impedance (effect of parallel RC members).

The 10:1 probe has a series 9MOhm resistor that constitutes a voltage divider with the scope's 1MOhm inner resistance. To make this 10:1 voltage divider independent from the frequency, there is a small variable capacitor connected in parallel with the 9MOhm resistor. The link shows how to compensate the pulse response by adjusting the capacitor in the probe's body. 
Here is another link on probes which include further variable components for compensating both at the lower and higher frequencies:
http://scope-probe-schematic.blogspot.com/

rgds,  Gyula

I'd like to understand how the compensation of the 10X probe works and what's different in its schematics compared to the 1X probe so that it can be modeled and overcome in the 10X case (that is, trying to do the opposite the 10X probe was designed to do). Couldn't find any such concrete information. It very well may be that it's proprietary. Apparently, the 1X probe induces favorable changes (favorable in terms of OU) in what the pulse generator supplies to the RC circuit, taking advantage of the natural asymmetry between I and V in terms of offset and providing a phase shift additional to what the C in the RC circuit provides naturally. That has to be understood well.