Then you have these capacitors which may change the way we think about
capacitors:
https://www.theengineer.co.uk/graphene-wearable-devices/
Steve
On Thu, Jul 19, 2018 at 6:38 AM, Stadem, Richard D <[log in to unmask]
> wrote:
> It kept you gainfully employed for decades, and boy we were glad "Doctor
> Capacitance" was always there with the full capacity of answering our
> questions on the subject, with authority.
> Odin
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of John Maxwell
> Sent: Wednesday, July 18, 2018 4:46 PM
> To: [log in to unmask]
> Subject: Re: [TN] capacitor measurement
>
> We need to keep in mind that the dielectric materials are polycrystalline
> semiconductors and do not behave in a linear fashion especially when
> dielectric layers are measured in a couple of microns, that just adds to
> the fun of it all:-) and kept me gainfully employed for decades.
>
> John Maxwell
>
> Sent from my iPhone
>
> > On Jul 18, 2018, at 4:51 PM, John Burke <[log in to unmask]> wrote:
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Lol,
> > If your theory is correct the “fluid stream” would follow the laws of
> fluid dynamics which it doesn’t since for the flow (current) to increase
> for a given resistance the pressure (voltage) would have to increase which
> is exactly the opposite of Bernoulli’s laws.
> > And yes an ageing capacitor does resemble a balloon in capacity terms.
> > Best regards.
> > John
> >
> >
> > Sent from my iPad Pro
> >
> >
> > From: 30171501600n behalf of
> > Sent: Wednesday, July 18, 2018 1:41 PM
> > To: [log in to unmask]
> > Subject: Re: [TN] capacitor measurement Ahhh, those blank, blank
> electrical engineers again. Why can't it be
> > simple? Current is a flowing fluid stream, just electrons not water.
> > Resistors are valves that increase or decrease the flow. Capacitors are
> > tanks where the fluid flow is stored. And now you are telling me the
> tank
> > size varies with age and temperature. What are you electrical guys using
> > for a tank - some kind of water balloon or something?
> >
> > On Wed, Jul 18, 2018 at 4:04 PM Wayne Showers <
> [log in to unmask]>
> > wrote:
> >
> >> What has been described is all good information, but here is the yeah
> but:
> >>
> >> At design:
> >> Voltage coefficient is the largest concern and for this reason, each cap
> >> should be overtightened and then loosened. General Rule I follow in RC
> >> circuits is to try to keep the capacitance as low as possible to
> counteract
> >> the effects of aging.
> >>
> >> In production testing:
> >> So long as the specifications are known, I use a variant of the old
> >> Mil-R-39008 (Carbon Comp Resistors) which is group average of 2X
> tolerance
> >> and for individuals, 3X tolerance. This has been effective in limiting
> >> both bad product and test failures. I also target testing at 60Hz for
> >> capacitors to limit capacitance depression from higher frequency and/or
> >> source impedance.
> >> These attributes will limit false rejections at Incoming Inspection and
> >> ICT.
> >>
> >> As for 'refreshing' capacitors:
> >> Baking above the Curie point is not always possible or for that matter
> >> even desirable, so I only ever did this on a limited basis.
> >>
>
--
Steve Gregory
Kimco Design and Manufacturing
Process Engineer
(208) 322-0500 Ext. -3133
--
This email and any attachments are only
for use by the intended
recipient(s) and may contain legally privileged,
confidential, proprietary
or otherwise private information. Any
unauthorized use, reproduction,
dissemination, distribution or other
disclosure of the contents of this
e-mail or its attachments is strictly
prohibited. If you have received
this email in error, please notify the
sender immediately and delete the
original.
|