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

["Keith Doxey" <ukha@xxxxxxx>]

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@xxxxxxx [mailto:matthew@xxxxxxx]
> Sent: 16 June 2001 14:03
> To: ukha_d@xxxxxxx
> 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!!!)
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > ____________________________________
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> > > > >
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> > >
> > >
> > >
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