> If nothing is plugged in and there is current on the ground wires,
> you have a ground loop.  You want to detect fractions of a milliamp,
> which you can do with a sensitive magnetic pickup.
>
> The old telephone listeners from Archer work well.  The newer RadioShack
> ones work but are noisy.  Or get a tri-field meter from
> the factory (Alpha Labs) and ask for the 100x external magnetic probe
> and a 1x small probe.  The 1x probe is ideal.
>
> Another way, if you have a good way to measure the magnetic
> field in the house, disconnect all the ground wires (with the power off
> to be  safe) at the panel and see if it improves.  Then start putting
> them back and find the problems on the ones that make it worse.
> But at that point you'll need a small probe anyway.
>
> You could try a clamp on ammeter but I don't know of any that are sensitive
> enough.
>
> On Thu, Feb 10, 2011 at 8:37 PM, emraware <[hidden email]> wrote:
>
>>
>>
>> Interesting discussion.
>> How do you detect a ground loop?
>> Can neutral to ground connections be detected with the electrical
>> receptacle testers?
>>
>> --- In [hidden email], Bill Bruno <wbruno@...> wrote:
>> >
>> > I thought that since 2000 or so linear power supplies
>> > are basically illegal (due to their poor efficency) to
>> > sell with electronics.
>> >
>> > You're right that the Stetzer gets rid of differential mode only.
>> > Question is why does the common mode convert back to
>> > differential mode further away? Most likely because of
>> > differences in capacitance to ground on the hot versus neutral.
>> >
>> > This doesn't surprise me, but it's also possible you have direct
>> > neutral to ground connections somewhere (other than the
>> > panel I mean... I suppose the signals could be bouncing back
>> > at the panel which might also explain it?) This might be
>> > worth finding and fixing. Easy to test at the panel if you can
>> > remove the ground or neutral bus bar without getting ill
>> > from the meter. Maybe better if you can find a young cheap
>> > electrician to do it. You can also have them check for
>> > connections between neutral wires.
>> >
>> > Or just open up every switch box that might have two circuits
>> > live in it and separate the grounds (and the neutrals if they
>> > are tied). You'd be surprised how removing a ground loop
>> > can reduce the fields throughout the house.
>> >
>> > BIll
>> >
>> > On Thu, Feb 10, 2011 at 8:16 AM, jaime_schunkewitz <
>> > jaime_schunkewitz@...> wrote:
>> >
>> > >
>> > >
>> > > I finally have clean electricity again, after
>> > > replacing the Motorola cable modem (Model SB5101U)
>> > > that Comcast provides. I'm using a Linksys
>> > > CM100-T1. The Motorola pegged my Entech powerline
>> > > noise analyzer (180 @ half sensitivity), while the
>> > > Linksys adds nothing to the reading. It even comes
>> > > with an analog 9v AC/DC power inverter.
>> > >
>> > > Here's an anecdote about using shunt capacitors as
>> > > filters. One capacitor brought the reading from 180
>> > > to single digits when plugged in and measured at the
>> > > same receptacle as the modem. However, at other
>> > > receptacles in the house I still measured the same
>> > > elevated readings. And the capacitor had no effect
>> > > on reducing the levels of AM radio noise.
>> > >
>> > > These so called filters appear to short out the higher
>> > > frequencies and quench differential noise at the
>> > > receptacle, however seem to push the noise elsewhere.
>> > > Just an observation.
>> > >
>> > > Eli
>> > >
>> > >
>> > >
>> >
>> >
>> > [Non-text portions of this message have been removed]
>> >
>>
>>  
>>
>
>