Re: *muppet alert* How do I use my multimeter?

[matthew@xxxxxxx]

Excellent!! someone speaking to me in a language I recognise!!!

Having said that, if you subclass Car to MattsLotus then BatterySize
== lightweightracebattery so battery weight == verylight

But I get your point

All in all, I think the cable is busted. As I said before, the break
is about 12" down from the garage ceiling and there is quite a lot of
slack up in the loft so hopefully I will be able to feed more slack
into the garage from the excess in the loft.

matt

--- In ukha_d@y..., "Keith Doxey" <ukha@d...> wrote:
> BatteryVoltage <= BulbVoltage.
>
> If ((BatteryVoltage=12)and(BatterySize=Car)) then
> 	TesterPortability = Low
> End If
>
> If BatteryVoltage > BulbVoltage then
> 	Bulb=VeryBrightButNotForLong !!!
> End If
>
> Keith :-)
>
>
> > -----Original Message-----
> > From: matthew@m... [mailto:matthew@xxxxxxx...]
> > Sent: 16 June 2001 14:03
> > To: ukha_d@y...
> > Subject: [ukha_d] Re: *muppet alert* How do I use my multimeter?
> >
> >
> > Oh crikey we're even getting technical with the battery choice
now!
> > So what battery/bulb combo makes a good tester?
> >
> > --- In ukha_d@y..., "Ian Lowe" <ian@w...> wrote:
> > > One quick warning!!!
> > >
> > > don't use a PP3. if you do have a short you will incinerate
the
> > thing...
> > > especially if you clip it on then wander to the other end
with a
> > bulb!
> > >
> > > Ian.
> > > ----- Original Message -----
> > > From: <matthew@m...>
> > > To: <ukha_d@y...>
> > > Sent: Saturday, June 16, 2001 12:13 PM
> > > Subject: [ukha_d] Re: *muppet alert* How do I use my
multimeter?
> > >
> > >
> > > > Thanks Keith. I've got to turn the power off in a mo to
> > decommission
> > > > the sockets in the room above node zero so when its off
I'll
test
> > the
> > > > wire again to see if it was induced voltage causing the
problem
> > (the
> > > > wiring to be decommissioned runs next to the coax at
the
moment).
> > > >
> > > > If i still get funny readings I will hunt out a bulb
and a
battery
> > > > from somewhere and try the low tech method.
> > > >
> > > > Cheers
> > > >
> > > > matt
> > > >
> > > > --- In ukha_d@y..., "Keith Doxey"
<ukha@d...> wrote:
> > > > > Either you are not making proper contact with the
probes or
you
> > may
> > > > be
> > > > > picking up some induced voltage.
> > > > >
> > > > > Resort to the low tech method.
> > > > > Battery and bulb. Battery at one end, bulb at the
other. If
the
> > > > bulb lights
> > > > > OK then the cable is OK. If it flickers, (which it
would do
if
> > your
> > > > 0.7 to
> > > > > 170 reading is accurate) then the cable is
knackered :-(
> > > > >
> > > > > Keith
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: matthew@m... [mailto:matthew@xxxxxxx...]
> > > > > > Sent: 16 June 2001 11:07
> > > > > > To: ukha_d@y...
> > > > > > Subject: [ukha_d] Re: *muppet alert* How do I
use my
> > multimeter?
> > > > > >
> > > > > >
> > > > > > Ian
> > > > > >
> > > > > > Thanks for your help. I set the meter to 200
ohms and the
> > results
> > > > are:
> > > > > >
> > > > > > 1) 1
> > > > > >
> > > > > > 2) Anything from 0.7 to 170!!!
> > > > > >
> > > > > > The meter is a digital one and for test 2 i
would have
> > expected a
> > > > > > constant readout? I'm not waving the cable
around and the
> > prongs
> > > > are
> > > > > > firmly pressed down.
> > > > > >
> > > > > > Any comments?
> > > > > >
> > > > > > matt
> > > > > > --- In ukha_d@y..., "Ian Lowe"
<ian@w...> wrote:
> > > > > > > two quick tests matt:
> > > > > > >
> > > > > > > make sure both ends are
"clean" (ie not shorting
together
> > core
> > > > and
> > > > > > screen)
> > > > > > >
> > > > > > > Measure resistance between core and
screen: if you get a
> > dead
> > > > short
> > > > > > > (anything up to about 15-20 ohms) then
your cable has
> > stretched
> > > > > > internally
> > > > > > > and the core and screen are touching.
> > > > > > >
> > > > > > > then take one end and twist it together
so the core and
> > screen
> > > > are
> > > > > > shorting:
> > > > > > > go to the oter end and emasure: anthing
*Except* a dead
> > short
> > > > means
> > > > > > your
> > > > > > > cable has been damaged and one of the
conductor paths is
> > broken.
> > > > > > >
> > > > > > > Ian.
> > > > > > >
> > > > > > > ----- Original Message -----
> > > > > > > From: <matthew@m...>
> > > > > > > To: <ukha_d@y...>
> > > > > > > Sent: Saturday, June 16, 2001 10:36 AM
> > > > > > > Subject: [ukha_d] *muppet alert* How do
I use my
multimeter?
> > > > > > >
> > > > > > >
> > > > > > > > Having put in quite a long run of
coax from node zero
> > > > (garage) to
> > > > > > the
> > > > > > > > loft as the downlink from the
aerial, I noticed that
> > about 12"
> > > > > > from
> > > > > > > > the ceiling of the garage it has
gone a bit floppy.
> > > > > > > >
> > > > > > > > Suspecting the coax may have broken
inside (bugger!)
I've
> > > > gone out
> > > > > > > > and bought a cheapo multimeter.
> > > > > > > >
> > > > > > > > I've stripped the end in the loft,
and twisted the
braided
> > > > screen
> > > > > > > > around the solid core. Back in the
garage, the
options on
> > my
> > > > meter
> > > > > > > > are 2000k, 200k, 20k, 2000 or 200
ohms. I guess the
plan
> > is
> > > > to set
> > > > > > > > the meter to one of those, touch
one prong on the
core and
> > > > one on
> > > > > > the
> > > > > > > > screen and look at the value
displayed.
> > > > > > > >
> > > > > > > > Trouble is I have no idea what I'm
looking for. I
don't
> > know
> > > > what
> > > > > > > > values will tell me the cable is
broken and what
values
> > will
> > > > tell
> > > > > > me
> > > > > > > > im ok. I also have no idea what
OHMs to set the meter
to.
> > > > Assuming
> > > > > > > > the cable isn't broken, is there
some way I can test
the
> > > > strength
> > > > > > of
> > > > > > > > signal ie. how much loss there is
over the run? I'm
> > reckoning
> > > > on
> > > > > > four
> > > > > > > > runs of coax from the loft to the
garage and it's
CT100
> > cable
> > > > but
> > > > > > if
> > > > > > > > the losses are too great I'll have
to get some CT125.
> > > > > > > >
> > > > > > > > Any help and advice gratefully
listened to!
> > > > > > > >
> > > > > > > > Yours muppetationally
> > > > > > > >
> > > > > > > > matt
> > > > > > > >
> > > > > > > > (ps. I promise one day I will
contribute something
> > worthwhile
> > > > to
> > > > > > this
> > > > > > > > group rather than just ask
questions all the time!!!)
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
____________________________________
> > > > > > > > Automated Home UK
> > > > > > > > http://www.automatedhome.co.uk
> > > > > > > >
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