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Why are Deskew Fixtures expensive?

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pdenisowski:

--- Quote from: tautech on September 06, 2023, 12:38:02 am ---Define HF.  ;)

--- End quote ---

Touché :)


--- Quote from: tautech on September 06, 2023, 12:38:02 am ---What frequency does your R&S deskew fixture offer ?

--- End quote ---

We spec it as rise/fall times and amplitudes: see attached

https://scdn.rohde-schwarz.com/ur/pws/dl_downloads/dl_common_library/dl_brochures_and_datasheets/pdf_1/RT-ZFxx_dat-sw_en_3606-7653-22_v1000.pdf

tautech:
Thanks for that.

Seems R&S also have a small loop too large for the 100 MHz Tek P6022 current probe, just like with Siglent DF2001A Deskew Fixture.  ::)

Had to modify mine by removing the PCB loop and fit a wire link to meet the P6022 0.140" max cable dia spec.

Martin72:

--- Quote ---Had to modify mine by removing the PCB loop and fit a wire link to meet the P6022 0.140" max cable dia spec.
--- End quote ---

And I had copied this "Tautech mod", plus an acrylic bottom plate.. 8)

tautech:

--- Quote from: Martin72 on September 06, 2023, 08:41:17 pm ---
--- Quote ---Had to modify mine by removing the PCB loop and fit a wire link to meet the P6022 0.140" max cable dia spec.
--- End quote ---

And I had copied this "Tautech mod", plus an acrylic bottom plate.. 8)

--- End quote ---
Tell me Martin, is the large loop running the same ~22kHz frequency as the small loop ?
I've never checked....as I don't have a large/monster current probe.  :(

Oh hang on, I measured both the risetimes here:
https://www.eevblog.com/forum/testgear/scope-probe-deskew-fixture-pcb-project/msg3169004/#msg3169004

kerouanton:

--- Quote from: pdenisowski on September 05, 2023, 11:44:35 pm ---Define "expensive" :)  Relative to the cost of the scope or relative to the cost of a current probe?

--- End quote ---

Thanks for the explanation about your RT-ZF20 fixture, and for the video you made.

The RT-ZF20 looks nice but yes for me (hobby usage) it's not in my budget. What I meant by "expensive" was about the price of raw components, no FPGA or MCU, just a NE555 and a MOSFET.


--- Quote from: pdenisowski on September 05, 2023, 11:44:35 pm ---And as some of you may have guessed, I also made a video about it a few months ago :)

--- End quote ---

Yes, I like your videos in general, I always learn something.
 :-+ :-+

BTW, I went to an automation fair in Bern yesterday and was able to see some MXO4 and other nice SA at the Rohde&Schwarz booth. I may be interested in the RTB2K-COM4 as I found a nice discount (well still quite expensive compared to Siglent for my small budget, but I'm quite tempted).

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