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Show us your square wave

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the Chris:
My pulse generator from Leo Bodnar arrived yesterday, so I would like to contribute with my slow-but-I-am-loving-it EDUX1052A. Measurements were taken with an RS Pro 50Ohm inline terminator that I ordered from Leo alongside the pulser.

I got 5.8767ns over 112k measurements. Considering the specified 50MHz and therefore assuming a classic -3dB drop, the BW = 0.35 / r_t should be valid, resulting in 60MHz bandwidth.

This is in line with what I estimated using a 10MHz to 60Mhz sinus sweep of my UTG962E, with pretty much no drop under 10MHz (not shown) and about ~1.2V peak in amplitude at 60MHz using a N2142A 75MHz probe in 10x mode.

Thanks Leo for the fast shipping and now including the customs and taxes loads for EU members!

EDIT: 5ns/div measurement added


David Hess:

--- Quote from: the Chris on November 10, 2023, 07:38:40 am ---My pulse generator from Leo Bodnar arrived yesterday, so I would like to contribute with my slow-but-I-am-loving-it EDUX1052A. Measurements were taken with an RS Pro 50Ohm inline terminator that I ordered from Leo alongside the pulser.

I got 5.8767ns over 112k measurements. Considering the specified 50MHz and therefore assuming a classic -3dB drop, the BW = 0.35 / r_t should be valid, resulting in 60MHz bandwidth.
--- End quote ---

I wonder where that aberration came from; it is much greater than I would expect considering the much faster settling time of the pulse generator compared to a 60 MHz oscilloscope.

My guess is that the oscilloscope does *not* have a Gaussian or single pole response.

Sighound36:
Below are four examples of square wave forms I looked at earlier, one using the Siglent SDG2042A 10Mhz 4V pk<>pk / 10Mhz ultra low phase noise -124dbm@1hz to -175dbm@10Mhz/ Leo Bodnar 40pS rise time generator/ 44.1Khz word clock.

Using Wavepro 4Ghz HD scope 50 Ohm T-flex 405 18Ghz cabling, full scope BW of 4Ghz NO ERS (software enhancement) up to 20GS/s rate. Scope up to temprature and calibrated.



Sighound36:
As we can only post 10 attachments second post last of the 44.1Khz images plus I thought if would be nice to show the eye pattern for each of these square wave sources as well

joeqsmith:
I followed  Leo Bodnar's threads about that pulsar but never bought one.   All of my scopes are too slow to verify it. 

Many years ago, I stumbled onto an employee of LeCroy who had purchased some of their junk at an internal auction.  They had the test fixtures for the 7200A.  Another gem was they had some of the 7262 plugins.  These are the only ones I have ever seen.   This plugin includes an ECL output for TDR measurements and has an analog BW of 4GHz.   I posted some data for it recently where it measures 118ps.   

https://www.eevblog.com/forum/testgear/12-ghz-active-probe-project/msg5007958/#msg5007958

I posted about my conversations with LeCroy about the risetime and bandwidth:
https://www.eevblog.com/forum/testgear/show-us-your-square-wave/msg593071/#msg593071

Typically RT*BW = 0.40 to 0.45 for modern high bandwidth scopes

4GHz * 118ps = 0.472.   Much higher than 0.35.   

If I attach another old relic, Tektronix S-52 which has a risetime of less than 25ps, the scope measures 111ps.   Or 0.444. 

This scope was my first DSO, outside of my HP scope/logic analyzer.   Originally owned by the USAF.   Released in 1989.   She's old but fun to play with.

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