[Uram-rejections] Harwell Rally

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> From webstump at chiark.greenend.org.uk Mon Feb 08 17:01:02 2016
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> From: paul <johnpaul at nowhere.com>
> Newsgroups: uk.radio.amateur.moderated
> Subject: Re: Harwell Rally
> Date: Mon, 8 Feb 2016 17:00:55 +0000
> Organization: Aioe.org NNTP Server
> Message-ID: <20160208170055.42b2f1bd at fanless>
> References: <n955jt$i3h$1 at gioia.aioe.org>
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> On Mon, 8 Feb 2016 12:48:59 +0000
> Brian Reay <no.sp at m.com> wrote:
> 
> > On 07/02/16 12:15, JMV wrote:
> > >
> > > "gareth" <no.spam at thank.you.invalid> wrote in message
> > > news:n95h9p$16ct$1 at gioia.aioe.org...
> > >> On Sat, 06 Feb 2016 16:05:06 +0000, JMV wrote:
> > >>
> > >>> Who's going to Didcot then
> > >>>
> > >>> J
> > >>
> > >> I'm very tempted. I've never been, is it generally well attended?
> > >
> > > Last year was the first time after about 15 year break for me, but
> > > it was very well attended. I topped up on Small Tools mainly but
> > > also got two Avo 8's for a fiver each, nostalgia I suppose.
> > 
> > AVO 8's (or other analog similar meters) are still useful.
> > 
> > For example:
> > 
> > When adjusting for a max or min, rather than a specific value, as you 
> > can see a trend more readily.
> > 
> > When measuring high voltages, the input Z of an AVO is (perhaps 
> > surprisingly) higher on a high voltage range higher than a typical
> > DMM.
> > 
> > If you do the sums. A DMM, typically has an input Z of 10Mohm. An AVO
> > 8, 20kohm/V.
> > 
> > So the 'cross over point' is 10^7/2 x 10^4 = 5000V
> > 
> > Therefore, once the AVO is set to measure more than more than 5kV,
> > the input Z is higher than a DMM.
> > 
> > I came across this in my Uni days (to be more exact in my vacation
> > job), when I was asked to design a high voltage supply for a GM tube.
> > As the current required was very low, the source impedance of the
> > supply was high and measuring the output with the DMM loaded it.
> > 
> > 
> > 
> That must have been very odd AVO because new AVO8 only measures up to
> 3000v and old model went 2500v. I have not seen DMM with 5000v
> range atall. 
> 
> 
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