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From: "Phil Allison"
References: <email@example.com> <8npR9.16063$jM5.firstname.lastname@example.org> <email@example.com>
Subject: Re: Low leakage parts
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Date: Sun, 5 Jan 2003 14:23:53 +1100
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"Winfield Hill" wrote in message
> Phil wrote...
> > Tom Bruhns wrote ...
> >> the roughly 0.1fA of leakage I'm seeing in 0.1uF polyprop caps
> >> at 10V suggests about 10^17 ohms effective shunt resistance,
> > ** The insulation resistance for some ( LCR brand)
> > polypropylene caps (if that is what you used) is quoted in the
> > Farnell cat as 1 x 10^11 ohms. For LCR polystyrene it is given
> > as 5 x 10^11 ohms.
> > Your suggested figure is some one million times better.
> > My doubts are reasonable.
> Phil, your doubt are NOT reasonable, quite the contrary.
** The figures I quote above *proves my point* - you should read my
post as a self defence and not an attack on Mr Bruhns claims.
Also read entire posts /thread so you can maybe see the purpose and
That's> because you Are doubting engineers who have far better
> skill, experience and equipment than yourself.
** That is just insane. You are so full of yourself, Win.
> In this thread you have been and are systematically doubting Tom's
> measurements and insights, while putting up weak irrelevant points
> to defend your doubts.
** Absolute bullshit. Tom (whom I do not know at all) put up ONE post
with NO details of his claim. Only today has he come back with any.
>> Tom has measured what he says he's measured.
** How do you know ? Were you there?
All claims that seem odd to others get challenged here - god knows
enough of mine have been and often very abusively. Every one of mine is
true - but if the "experts" here have no personal experience of something
then it can look very unlikely to some of them.
> For you to postulate conditions he didn't experience is wrong and
** Absolute rubbish - what you are saying here is WRONG and IRRLEVANT to
anything I actually posted. You are making a pompous, idiotic and offensive
speech, Win. That is very bad usenet practice - you should stick to
responding to someone's actual words and not indulge in wild imaginings of
[I have further opinions, but I'll remain silent.]
** I have some beauts about pricks like you too.
> Furthermore some of the rest of us have made similar measurements,
> are aware of "official" laboratory measurements on the properties
> of air, etc., and have therefore repeatedly offered our opinion on
> the reliability of Tom's reports, which knowledge and opinion you
> have rejected.
** This is all garbage - what are posts are you referring to ? Your
statements make no sense - it is all non-specific. You have enough
intelligence to realise how wrong it is to do this. No-one can answer a
non-specific complaint since that is merely abuse.
> As for your Farnell data, those are WORST case specs, thankfully
> rarely seen in practice.
** How do you know that ?? Look like typicals to me.
A production engineer ignores them at
> his peril, but you cannot use them to argue against laboratory
> component measurements made by skilled engineers who know better
> than you what they are doing.
** I did not do any such thing, Win. I posted them in self defence -
to show my reaction to the OPs claim was based on some evidence.
As I posted, PCB leakage phenomena is familiar territory to me from
my experience with designing condenser mic pre-amps and various repair work
on such mics.
> For these reasons I say, "Drop it: Your doubts are NOT reasonable."
** Yes they are entirely so. "Reasonable" and "correct" are not
synonyms you realise.
If you have some inside knowlede about the OPs expertise, fine - but I
do not and there was nothing in the OP to say how the amazing cct was built.
Can you try *real hard* Win to SEE a situation on a NG from *other*
than your OWN ivory tower point of view ??
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