Show us your square wave

[joeqsmith]

Now, why would Tektronix do that?  One would think that their pictured result would exemplify best practices???

Well ... Back in the 80's my mind set was a PC with a clock frequency of 50MHz, never going to happen.    I will never need a scope with more than 100MHz BW.  ....  Our high end scope where I worked was a large 100MHz Tektronix DSO.  I was using a Tektronix Polaroid camera to record data...   I'm not surprised at all by the demo boards layout.  Wouldn't surprise me to find out it was an intern's project.   

The trigger and missing pulse test was a problem for some of our scopes at that time.   

I keep a spook of wire on-hand to make these springs from scratch.  1) I start by tightly wrapping the probe's ground.  2) I remove the spring and give it a half turn.  Round need nose pliers work fine.  This gets enough tension on the spring to lock to the probe.   3) Ground strap is made from copper foil.  Sometimes I use braid.   All depends...  4) Solder the spring to the strap.  5) For insulation, I use Kapton.  With braid, some heat shrink or woven high temp fabric.   Depends.    6) Solder the ground strap to the board we leaded solder.  I won't use that lead free stuff for home use.    7) attach probe and measure.

Still not a great setup, but consider these are pretty slow edges we are dealing with.  Here was a home made probe where we were playing with much faster edges.   I was attempting to get the ground inductance and loop as small as possible.

https://www.eevblog.com/forum/testgear/12-ghz-active-probe-project/msg5006290/#msg5006290

[Gerhard_dk4xp]

<    https://kh6htv.com/pspl-app-notes/   >

Most interesting reading.  When the founder/owner of Pico Secod Puls Labs retired,
he sold the farm to Tek.
First thing that TEK did was to axe the app notes from the PSPL web site.
Probably too many independent comparisons.   

Gerhard

[joeqsmith]

<    https://kh6htv.com/pspl-app-notes/   >

Most interesting reading.  When the founder/owner of Pico Secod Puls Labs retired,
he sold the farm to Tek.
First thing that TEK did was to axe the app notes from the PSPL web site.
Probably too many independent comparisons.   

Gerhard

I took it that was his kid.   Seems most private companies don't survive once they are handed off to the next generation.  Normally the kids are not prepared and the company dies in short time.   I watched an interview with Soichiro Honda where one of the questions was who would be his successor.   He was very point blank about not letting his kids have it.  Too much of his life to build it.

Jim retired from PSPL in 2001 and turned over the reins of the company to his oldest son, Scott. PSPL was a dynamic, high-tech company producing ultra-fast risetime (5 ps) and ultra-high bit rate (40 GB/s) pulse and pattern generators and bit error rate detectors, 100GHz sampling oscilloscope, plus a line of ultra-broadband (kHz to > 50GHz) coaxial components, including amplifiers and bias tees.    In January, 2014, PSPL was sold to Tektronix.

[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. (...)

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.

Yes, I did not expect to see this kind of overshoot on a scope with 50MHz bandwidth. For reference, this is the same pulser on the EXR104 I am using at work. This time without inline terminator in native 50R mode.

[David Hess]

Yes, I did not expect to see this kind of overshoot on a scope with 50MHz bandwidth. For reference, this is the same pulser on the EXR104 I am using at work. This time without inline terminator in native 50R mode.

Now you get to ask yourself why there is preshoot.

[joeqsmith]

GigaWave with Tektronix S-52 tunnel diode head (<25ps Tr)

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

[hpw]

GigaWave with Tektronix S-52 tunnel diode head (<25ps Tr)

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

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

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

[SJL-Instruments]

GigaWave with Tektronix S-52 tunnel diode head (<25ps Tr)

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

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

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

Thanks for the suggestion  We'll add the ability to graph any measurement vs. time to the software. (Fastest update rate would be 1 datapoint per sweep.)