High Quality EMF Meter

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Ravenvalor

Ravenvalor

Senior Member
Location
Piedmont region of NC
Hello,

Thanks to the great info found on this forum I am finally convinced that a good Gauss meter is an asset to both my business and the health of my family (I have 3 separated - 21,000 volt power lines about 25' above my lawn and about 50' from my house). I believe that it may also be a good idea to get a meter that will also test EMFs at the much higher frequencies. Can someone please recommend such a device? Dennis Alwon has found good gauss meters in the $100 to $200 range so I am hoping by adding the other features I can still keep the price tag under $500.

Best regards,
 
So what is it that you want to measure, body voltage?, electromagnetic field? or radio frequency? Persons who are really sensitive get all three type meters. My experience with the body voltage is slight and IMO, a bit difficult to deal with. I have not work with RF at all.

There are more and more people fighting the power company to get their RF meters changed back to the old style.... It can be a losing battle.
 
They just changed out my water meter to one that has a cellular radio unit. All those people fighting the power company are nuts. I want to see them throw away their cell phones, stay away from other people and cell sites. :dunce:

-Hal
 
Dennis Alwon said:
So what is it that you want to measure, body voltage?, electromagnetic field? or radio frequency? Persons who are really sensitive get all three type meters. My experience with the body voltage is slight and IMO, a bit difficult to deal with. I have not work with RF at all.

There are more and more people fighting the power company to get their RF meters changed back to the old style.... It can be a losing battle.
Click to expand...

Some people are buying the old style online and just replacing them themselves I guess.

I think I am just going to stick with a gauss meter. The Bell 4190 looks okay. Just want to know how much energy is coming out of those 3 - 21,000volt power lines that are about 25' above our future patio and garden.

Thanks for referring Karl Riley. I will probably purchase his book also. Then I can use the 4190 to troubleshoot electrical problems.
 
hbiss said:
They just changed out my water meter to one that has a cellular radio unit. All those people fighting the power company are nuts. I want to see them throw away their cell phones, stay away from other people and cell sites. :dunce:

-Hal
Click to expand...

ok. i'm stupid here. help me out.

what is the issue with a meter that transmits
readings wirelessly? either water, gas or power.
i'm assuming they all transmit about the same signal type
and strength.

is there concern that there is a health hazard with the
electronic transmission?

or is it a social concern about monitoring in general?
 
Fulthrotl said:
ok. i'm stupid here. help me out.

what is the issue with a meter that transmits
readings wirelessly? either water, gas or power.
i'm assuming they all transmit about the same signal type
and strength.

is there concern that there is a health hazard with the
electronic transmission?

or is it a social concern about monitoring in general?
Click to expand...

AFAIK the concern is with RF emissions that are far lower than cell phones, but might happen to be right next to the headboard in the master bedroom.
I have not heard anyone express privacy or big-brother concerns. The remotely triggered disconnect may bother some people though.
 
GoldDigger said:
AFAIK the concern is with RF emissions that are far lower than cell phones, but might happen to be right next to the headboard in the master bedroom.
I have not heard anyone express privacy or big-brother concerns. The remotely triggered disconnect may bother some people though.
Click to expand...

'k... thanks.

i'm in a corner room in my house. 6' from my head is
the wireless meter, on a 45 degree bearing.
8' from my head, 180 degrees opposite, is the wireless
gas meter.

so, if my posts veer widely off the path, you'll at least
have something you can blame it on that isn't congenital.

the whole EMF poisoning is something i'd have to look at
with a hard eye. my thought is that the belief in it would
have a far stronger effect than the EMF waves themselves.

i squared r losses would seem to calm down any radiant
energy pretty quickly.

however, a 10' long piece of pipe laying parallel under a
230 KV bus 30' overhead on a warm day when the air
conditioners were on, had a strong enough field to induce
90 volts in that pipe, and you could clip on, and run a
milwualkee drill with it. you couldn't touch the service
truck parked there without gloves on.

most of us don't spend that much time near that much EMF
however.

i can only worry about so many things at once. north korea
just announced they can launch a nuke that can reach LA.
it was cause for rejoicing in the hermit kingdom.

one thing at a time.
 
170821-1253 EDT

Ravenvalor:

If you have an isolated long straight single wire with 1 A current flow in the wire, then the magnetic flux density at a radial distance of 1 meter is about 2 milligauss. The flux density is inversely proportional to radial distance, or at 1 foot about 6.56 milligauss. The intensity is directly proportional to curent, or 65.6 milligauss at 1 foot and 10 amperes.

If the return path for the current was a straight wire parallel to the first wire. and 10 feet awary, then the flux density at 1 foot would only be reduced by about 10%. The return path is a canceling field.

I have a magnetic flux density sensor that I bought about 60 years ago. Probably cost about $10. This is simply a many turn coil (thousands probably) with an electrostatic shield and cable for connection to a meter. The calibration is 20 * Hz/60 milli-volts/Gauss. In other words for a 60 Hz sine wave the voltage output is 20 microvolts for 1 milligauss. With a 1500 turn coil on a 5/8" square bobbin I get about the same results.

Note: with magnetic induction into a coil the output voltage increases in proportion to frequency for a fixed flux density. Therefoire, high harmonic content in the current waveform can produce higher than expected readings. I get large readings in front of my 20" CRT, but with capacitive filtering the readings drop to near zero.

In my house or yard I generally read around 0 to 20 microvolts. Quantizing is 10 microvolts. There is higher than 60 Hz noise that causes variations in the readings.

Below my three phase lines the readings may be slightly higher. But, I really need a preamp and filter to make low level measurements.

.
 
I went to some power lines in a customers backyard and really didn't get much of a reading at all with my gauss meter. I suspect in the evening when everyone gets home there may be a different issue.

If you go online to http://www.magneticsciences.com/ you can get different meters. I believe Karl has something to do with this company. The guide book I received with my meter was written by Karl who also designed the gaussmeter I am using'

Karl suggests if you are only buying one gaussmeter then you should get a single axis meter with a separate probe. That is what I got. The only problem with a tri-axial meter is that it makes it difficult to find the source of the field while a single axial meter can direct you to it.
 
Dennis Alwon said:
Karl suggests if you are only buying one gaussmeter then you should get a single axis meter with a separate probe. That is what I got. The only problem with a tri-axial meter is that it makes it difficult to find the source of the field while a single axial meter can direct you to it.
Click to expand...

I believe the new meters have a button where you can switch from single to triple in order to locate source better.


https://www.amazon.com/EMI-Magnetic...dp/B01HQBRZ9O/ref=cm_cr_arp_d_rvw_txt?ie=UTF8
 
gar said:
170821-1253 EDT

Ravenvalor:

If you have an isolated long straight single wire with 1 A current flow in the wire, then the magnetic flux density at a radial distance of 1 meter is about 2 milligauss. The flux density is inversely proportional to radial distance, or at 1 foot about 6.56 milligauss. The intensity is directly proportional to curent, or 65.6 milligauss at 1 foot and 10 amperes.

If the return path for the current was a straight wire parallel to the first wire. and 10 feet awary, then the flux density at 1 foot would only be reduced by about 10%. The return path is a canceling field.

I have a magnetic flux density sensor that I bought about 60 years ago. Probably cost about $10. This is simply a many turn coil (thousands probably) with an electrostatic shield and cable for connection to a meter. The calibration is 20 * Hz/60 milli-volts/Gauss. In other words for a 60 Hz sine wave the voltage output is 20 microvolts for 1 milligauss. With a 1500 turn coil on a 5/8" square bobbin I get about the same results.

Note: with magnetic induction into a coil the output voltage increases in proportion to frequency for a fixed flux density. Therefoire, high harmonic content in the current waveform can produce higher than expected readings. I get large readings in front of my 20" CRT, but with capacitive filtering the readings drop to near zero.

In my house or yard I generally read around 0 to 20 microvolts. Quantizing is 10 microvolts. There is higher than 60 Hz noise that causes variations in the readings.

Below my three phase lines the readings may be slightly higher. But, I really need a preamp and filter to make low level measurements.

.
Click to expand...

Amazing. Your meter reads microvolts. "Quantizing is 10 microvolts" Please explain? The meter that you have sounds like a good tool to have plus a collectors item. You have to wonder if the new meters factor all of the harmonics in. If not then you have to know the physics to be proficient in calculating accurate readings. Thanks..
 
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