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From: john larkin <jlarkin_highland_tech>
Newsgroups: sci.electronics.design
Subject: Re: Instead scopes
Date: Sun, 01 Sep 2024 13:17:03 -0700
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On Sun, 01 Sep 2024 15:53:46 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:

>On Sun, 1 Sep 2024 17:55:58 -0000 (UTC), Phil Hobbs
><pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>>john larkin <jlarkin_highland_tech> wrote:
>>> On Sun, 1 Sep 2024 17:45:46 +1000, Bill Sloman <bill.sloman@ieee.org>
>>> wrote:
>>> 
>>>> On 30/08/2024 2:21 am, Jan Panteltje wrote:
>>>>> On a sunny day (Fri, 30 Aug 2024 00:43:39 +1000) it happened Bill Sloman
>>>>> <bill.sloman@ieee.org> wrote in <vaq1f2$jdj$1@dont-email.me>:
>>>>> 
>>>>>> It's lot easier and quicker to bread-board a circuit in LTSpice than it
>>>>>> is to wire up a test circuit, but what that means is that you need to
>>>>>> make fewer real circuits and they are a lot more likely to work when tested.
>>>>>> 
>>>>>> That, on it's own, is enough to explain why labs look different today
>>>>>> than they did in the dark ages.
>>>>> 
>>>>> All it explains is boeings falling apart and astronuts ending up stuck at the ISS
>>>>> and no moonlanding from the US, not even a probe.
>>>>> Slimulations are _not_ realty and never will be.
>>>> 
>>>> But they can capture useful parts of reality, if you know what you are 
>>>> doing.
>>>> 
>>>> John Larkin's simulated inductors tend not to have any parallel capacitance.
>>> 
>>> The trick is to know when it matters. ESR and core loss are usually
>>> more important.
>>> 
>>> I designed this surface-mount inductor for my Pockels Cell driver,
>>> after several tries using commercial parts. They all smoked.
>>> 
>>> It's wound on a specially marked Sharpie pen that we have carefully
>>> reserved.
>>
>>It better have a regular calibration schedule, or your semiconductor
>>customers may give you the raised eyebrow. 
>
>Hmm.  To be overly serious:  With traceability to NIST (US) or NPL
>(UK) or the like.
>
>The trend in standards is to eliminate standards tied tp a physical
>object.
>
>I have a Sharpie in hand.  The barrel that is not covered by the cap
>is a truncated cone, being 11.0 mm at the blunt end and 12.32 mm near
>the cap, 73 mm away.

Mine is pretty cylindrical for the length of the coil. I expect that
the operator's (ie, my)  applied tension affects the radius too.

That inductor sees 25 amps p-p, roughly a sawtooth, at 4 MHz. The
Coilcraft parts that I tried all smoked, I guess from skin effect and
proximity effect.

>
>Actually, all that's needed is to specify an ideal geometric shape,
>with tolerances, in the formal documentation.  
>
>Joe Gwinn

I'll have someone start on a SolidWorks model.