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From: Joe Gwinn <joegwinn@comcast.net>
Newsgroups: sci.electronics.design
Subject: Re: Instead scopes
Date: Sun, 01 Sep 2024 15:53:46 -0400
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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.

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

Joe Gwinn