Products > Test Equipment
Show us your square wave
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guenthert:

--- Quote from: Electro Fan on June 11, 2024, 09:53:54 pm ---About 9.5 years after the original post “can be easily identified as such“ sounds like a reasonable criterion to me :)
EF

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And yet, only Tomorokoshi was able to produce one in https://www.eevblog.com/forum/testgear/show-us-your-square-wave/msg1332941/#msg1332941

Seriously though, if the request would have been for a periodic composite signal where there are only odd harmonics, decaying with 1/f and where at least the fifth harmonic is included to 70%, there wouldn't be much needless discussion about the shape, the bandwidth requirements would be obvious and also that an oscilloscope isn't the ideal tool for this.   But then, where would be the fun in that?
TurboTom:

--- Quote from: Electro Fan on June 11, 2024, 09:53:54 pm ---
About 9.5 years after the original post “can be easily identified as such“ sounds like a reasonable criterion to me :)
EF

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At least, this permits posting some seriously low frequency square waves...  >:D
Electro Fan:

--- Quote from: Performa01 on June 12, 2024, 06:27:31 am ---
--- Quote from: Electro Fan on June 11, 2024, 09:53:54 pm ---About 9.5 years after the original post

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Huh?

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When I made the original post almost a decade ago I had some feedback about “what’s a strong square wave?” I wasn’t sure then and I’m still trying to learn - but your descriptive wording resonates well with me.   :-+
joeqsmith:

--- Quote from: hpw on January 18, 2024, 06:07:47 am ---
--- Quote from: joeqsmith on January 18, 2024, 03:40:43 am ---GigaWave with Tektronix S-52 tunnel diode head (<25ps Tr)

https://www.sjl-instruments.com/

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Nice, what I would like to see the real time behavior, as 20..80% or 10..90% rise time changes over time :D

On a LeCroy easy to graph over time as rise f(t).

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Better late than never.   Showing the output from the LiteVNA (low cost VNA). 

joeqsmith:
Showing the risetime drift using the latest software with tracking  enabled.  The Tektronix pulser is very slow.  There is a tradeoff between the drift, amount of and how fast the data is collected and the repeatability.   I would imagine if this pulser had a faster pulse rate, I could collect more data and this measurement would tighten up.   

Still, less than 5ps over a span of 21 minutes.   Also they spec the scope for 40ps typical 80/20.   All of the measurements I have made fall below that.   

***
Also shown after 50 minutes, it is starting to appear gaussian with less than 7ps.   
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