Re: Opinions

["HoneywellTech" <seccon1@xxxxxxxxxxx>]

Paul,

There is nothing wrong with the thurough circuit test that you are doing
based on resistance. I think the best response was given by Marc or someone
who mentioned that Radionics Tech supt asked about voltages on the loop.

If you call and say the panel shows a violated loop and say you have checked
the circuit and its good. A voltage reading accross the circuit is a quick
way to double check. (Without meaning to offend, the average tech doesn't
know what the voltage is suppose to read so he can't guess or even lie,) now
he gives the voltage. Since he was not holding the leads and the wire, his
body resistance is not a factor.

Example. Take your favorite panel, with the EOL accross the zone, read the
voltage, open the circuit by lifting one leg of the EOL now the voltage
rises. Short the circuit and the Voltage falls to approx 0v.
Armed with this you can also see when the voltage rises above the value
shown with just the EOL then the loop resistance is above the value of the
EOL.

The magic stops when the Panel is broke and No voltage comes out of the
circuit terminals, Now you have to open at least one side of the circuit so
that you can eliminate the load as the possible cause.

But the beauty still is that you identified the status of the loop without
eliminating the circuit entirely from the control.

This does nothing to troubleshoot the suspect component, i.e. motion.
glassbreak etc.

decide for yourselves, nice chatting with you guys

"Paul" <someones-father-@xxxxxxxxxxx> wrote in message
news:DjQze.29121$oJ.14895@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Another question then. If you read the voltage across a zone at the panel,
> without disconnecting it from the panel, and there is a fault on another
> zone, does it effect the voltages on the rest of the panel. And will this
> lead to a false result. Thats why I disconnect and test the resistance. At
> least you know that there is nothing else that is going to influence the
> results (unless there is some sort of earth loop I suppose)
>
> Paul
>
> "HoneywellTech" <seccon1@xxxxxxxxxxx> wrote in message
> news:Mmlze.6313$x82.5971@xxxxxxxxxxx
> > Exactly Paul,
> >
> > Since resistance drops voltage (from the control panel zone) the reading
> > is
> > equally reliable as pulling the loop and using a resistance check but
the
> > "Benefit" is that the tech does not have to remove the loop.
> >
> > When providing tech support in the past, it has amazed me that many long
> > time Pros don't know that there is a voltage drop accross a Class B
> > circuit.
> >
> > They must think that the panel sends water through there.
> > ;^)
> > "Paul" <someones-father-@xxxxxxxxxxx> wrote in message
> > news:GJ4ze.17038$oJ.2732@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >> Thats was my reasoning as well. Ive had a few techs say that its better
> >> to
> >> test the voltage while the zone is connected to the panel. My argument
> >> was
> >> also that as relating to Ohms law, resistance, voltage and current are
> >> all
> >> related and if one changes then there are changes elsewere. Ive been
> >> servicing and fault finding for years using the testing of the circuit
> >> and
> >> checking the resistance method with great results, but im always
willing
> > to
> >> listen to better methods.
> >>
> >> Paul
> >>
> >>
> >> "Jackcsg" <nospam@xxxxxxxxxx> wrote in message
> >> news:xNOdncvjB-RCuVHfRVn-gw@xxxxxxxxxxxxxxx
> >> > Panels don't see resistance. They see voltage. The difference in
> >> > resistance
> >> > is what changes the value of the voltage, or simply put, the
tolerances
> >> > between the two determine the status of the loop (as the panel sees
> >> > it -open/closed/short). There is no benefit, just another means of
> > testing
> >> > a
> >> > circuit. Where it would make a difference is if you were hunting for
a
> >> > ground fault on a circuit.
> >> >
> >> > Jack
> >> >
> >> > "Paul" <someones-father-@xxxxxxxxxxx> wrote in message
> >> > news:LJPye.16372$oJ.10172@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >> >> What would be the benefit of testing the voltage across a zone of a
> > panel
> >> > to
> >> >> ascertain whether or not the device is faulty, over testing the
> >> >> resistance
> >> >> of the circuit?
> >> >>
> >> >> Just curious.
> >> >>
> >> >> Paul
> >> >>
> >> >>
> >> >
> >> >
> >>
> >>
> >
> >
>
>