From: "Saved by Internet Explorer 11"
Subject: What is a Ground Loop and why should I care?
Date: Mon, 24 Aug 2015 15:36:08 -0700
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=EF=BB=BF
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What is a Ground Loop and why should I =
care? =20
=20
Originally Web posted 24 September 2000. Content =
last=20
modified Friday, 25 January 2008
. External links last verified Sunday, 30 January 2005.
IMPORTANT: This =
information=20
is provided AS-IS, for informational purposes only, with no warranty=20
whatsoever. Despite the author=E2=80=99s intent to provide =
accurate,=20
helpful information, the information contained on these pages may be=20
inaccurate. Neither Sonic Purity nor anyone at Siber-Sonic.com can =
control=20
your ability to successfully and safely utilize this information, and =
we=20
accept no responsibility for anyone=E2=80=99s actions (beyond our own) =
related to the=20
content of this website. Incorrect wiring, whether or not done as a =
result of=20
the information on these pages, can easily lead to electrical shocks, =
fires,=20
equipment damage, and more. This page is intended for reasonably =
competent=20
adults who are generally able to successfully work with their hands, =
minds,=20
and follow instructions. If you have any doubt as to your ability to =
perform=20
any of the tests or other operations described on these pages, and/or =
if you=20
do not fully understand the instructions contained on these pages =
and/or the=20
operation of your particular test equipment, please =
leave the=20
execution of the tests or other operations described on these pages to =
properly trained, competent electronics technicians.
These pages are intended to help homeowners deal with common ground =
loop=20
problems on A/V and/or computer systems in the home. This topic is very =
complex,=20
and by no means are these pages exhaustive. Many other considerations =
apply in=20
business situations, and especially in recording studios, broadcast =
facilities,=20
and the like. Please consult other resources for important information =
on ground=20
loops in these more complex environments.
These pages are NOT intended for technicians, electrical engineers, =
or even=20
advanced home audio/video enthusiasts, who already are familiar with the =
details=20
of system interconnections and interactions with the power distribution =
system.=20
While the author has not fully evaluated the many, many, many web pages =
which=20
discuss the topic of ground loops, upon casual searching, one particular =
site=20
stands out:
Ground =
loop problems and how to get rid of them
=20
Readers may wish to read the above link and/or visit other pages =
(found via=20
the usual search facilities) before reading what i have written below. I =
decided=20
to finish writing my ground loop pages in hopes of adding some details =
which=20
will be important for non-technicians to be able to practically come to =
terms=20
with any ground loop problems they may have.
What is a Ground Loop and =
why should I=20
care?
Ground loops are the situation where there is more than one =
electrical path=20
to ground for electrical/electronic equipment.
The more interconnected equipment, the more possibilities there are =
for=20
ground loops to form. Ground loops can always cause problems, though =
they are=20
most likely to cause problems for video, audio, and computer systems. =
The bigger=20
the system, and/or when there are different systems in different rooms =
with=20
something tying them all together, ground loops become more common and =
more=20
problematic.
The most common symptoms for ground loops are:
Distorted video, often wavy lines, dark bars, etc.
Distorted audio, most often hum.
Miscellaneous computer glitches, and possibly computer audio =
system=20
hum.
Much bigger problems during lightning storms or when one piece of=20
equipment in any of the systems suffers a major failure. Other systems =
may=20
suffer severe damage too, thanks to the ground loop(s).
Cable TV (etc.) systems are just about the most famous source of =
ground loops=20
in the home, since they usually connect together several different =
=E2=80=9Csystems=E2=80=9D:=20
one or more TVs + audio system (sometimes) + (these days) computers. The =
outer=20
conductor of the coaxial cable is shared between all these, and forms =
one half=20
of the ground loop. The other half of the loop is formed by one or more =
of the=20
systems having the famous 3-prong A.C. cords (almost a certainty for =
computers),=20
and sometimes by some tricks on 2-prong TVs and audio systems. Since the =
A.C.=20
power system is connected to earth ground (mandatory since the early =
1900s per=20
the =
National=20
Electrical Code =C2=AE - the NEC), and since the cable system as it =
enters your=20
house is also required by the selfsame NEC to have its outer conductor =
connected=20
to earth ground, a ground loop is formed.
Even with only one VCR, there is a ground loop through the power =
cord, to=20
earth ground, to the cable splitter, to the cable shield, and back to =
the VCR.=20
There are many more when additional TVs, VCRs, data modems, FM tuners, =
etc. are=20
connected.
What is one to do? Attempting to defeat the 3-prong A.C. ground will =
enhance=20
the probability of even more problems with lightning and more extensive=20
multi-system damage, violates the NEC (Article 250 section 21(d), 1996 =
edition),=20
and may increase your exposure to unsafe voltages on the cases of =
failing=20
equipment, so that=E2=80=99s out.
Disconnecting the cable ground where it enters the house often cures =
(or=20
helps cure) the ground loop(s) and the stuff is still grounded via the =
A.C.=20
cords, yet the cable company will absolutely disown you, this too =
violates the=20
NEC (Article 820 section 33, 1996 edition), and there is a risk of =
greater=20
lightning damage.
The only viable choice is to somehow break the ground connection as =
it passes=20
along the outer conductor of the cable lines. This is done by using =
isolation=20
transformers. These handy devices block D.C. and low frequency A.C., yet =
pass=20
the much higher frequency standard video and (i presume) data =
frequencies, and=20
effectively solve the problem.
Because nothing is perfect in this real world of ours, all isolation=20
transformer arrangements cause a small degree of signal loss, so they =
should=20
only be used where necessary. On following pages is a description of how =
to=20
determine which units/systems need isolation, and which do not. This =
process is=20
a major pain, yet it is vital for trouble-free operation of everything =
when=20
complex systems such as this are being set up, and whenever a new system =
or=20
component is added.
Aside: your cable folks may or may not know about/pay much attention =
to this.=20
It=E2=80=99s a tough problem to solve, and costs lots of time and money. =
Some would=20
rather folks didn=E2=80=99t know about it. And, in all honesty, many =
otherwise=20
knowledgeable installers do not know about ground loops, or have been =
woefully=20
misinformed.
Author=E2=80=99s Qualifications
Ground loops were a problem both in stereo repair and especially in =
broadcast=20
engineering. I was a professional home audio repair technician from 1981 =
to=20
1995, and an SBE =20
certified broadcast engineer (AM/FM) from 1986 to 2001. I=E2=80=99ve =
attended seminar=20
classes talking about nothing other than ground loops and read many =
articles=20
about ground loops, and had to personally quash several, so i feel safe =
saying=20
that i am probably better informed than most folks not in these fields =
about=20
them.
Notwithstanding the above paragraph, there are many, many excellent =
websites=20
which discuss ground loops, and feature all sorts of potentially useful=20
information and alternative pictures and explanations, none of which =
will be=20
found on these pages. You are highly encouraged to visit other ground =
loop=20
sites.
Ready? Continue on to Testing=20
for Ground Loop Problems
World O=E2=80=99 Electronics The=20
Sonically Pure Pages
This Siber-Sonically Pure Page is , ,=20
and compliant.
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