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Post Time: 15/10/2007 19:59:40 |
cdc
Total Forum Posts: 3 |
Hello
Do you have any data on the distance magnetic fields extend from their source? I suffer from a few types of appliances (TV, HiFi, NTL box, Computers (the computer - not the monitor)) and from what I have read high frequency magnetic fields seem to be associated with these items.
I can be 30 metres away from the machine and still be affected by it. I also have a trifield meter but the readings drop away only inches from the appliance; and appliances that do not affect me also register (sometimes higher) on the meter.
Or if magnetic fields do not extend out tens of metres from a hi fi or tv is their a field of some sort that does?
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Post Time: 16/10/2007 05:29:52 |
alasdairP
Total Forum Posts: 173 |
Not really, is the answer. All makes and models emit fields differently. Also, you need to try to work out what things affect you most. Some people react to power-frequency magnetic (less commonly) and electric (more commonly) fields. They are generally quite well contained and fall off fairly quickly from the appliance / equipment. The normal Trifield meter is not sensitive enough on electric field - you need a fll scale of 1000 or 2000 V/m, not 100,000 V/m (100 kV/m). It also has a rising magnetic field frequency response, so it over-reacts in a mjor way to higher frequencies such as line-scanning from an ordinary TV.
However, most fields from TVs fall off within 2 metres to very low levels and from computer monitors within one metre away.
The 30 metres away reaction suggests that you are (also?) reacting to RF / microwave radiation. I would suggest you purchase an Electromsog Detector from Emfields and carry it around with you. Does it get ouder when you react? What are the forms of pulsing you react most to (by their sounds on the ESD). It is often very difficult to know weher these sources are. The RF sensitivity of the Trifield is far too poor to pick up most of the modern troublesome sources thast sensitive people are reacating to.
So my first advice would be to get an Electrosmog Detector from EMFields or from Sensory Perspective in Baker Street and do some more investigating with a more sensitive monitor to try to track down what you are actually reacting to.
I hope this is helpful to you.
Alasdair P
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Post Time: 16/10/2007 19:00:06 |
cdc
Total Forum Posts: 3 |
It is definitely the appliance.
It is not microwaves (unless a tv or dvd player emits these). I also got a RF field strength meter a while back but got nothing from the appliances.
I switch the appliance on and I get a burning in my head; I switch it off and it goes away. Nothing else affects me.
They have just installed a new computer at work which affects me; and does so from 20+ metres away.
As you say most things drop off very quickly and their effect is minimum if I step back from them. But these few things do not.
I will try the Electrosmog detector then.
Thank you.
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Post Time: 19/11/2007 13:22:18 |
Jean Philips
Total Forum Posts: 22 |
New appliances can give off chemical fumes from the casings when they are switched on and the casing (and internal components warm up. It can take up to 6 months for chemical release to decrease to a level that the most sensitive people may react to. It takes less time for people who react less seriously.
20+ metres is too far away for electromagnetic fields still to be at a high level. Maybe it's worth casting your eye around where you feel affected to see if it is something else? I'm sure that you have done so, but it is difficult to think of it being a pure reaction to EMFs - a combination of factors?
Best wishes
Jean Philips |
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Post Time: 07/03/2008 20:29:25 |
cdc
Total Forum Posts: 3 |
Hello again
I am wondering do you provide a testing service, ie. send you my hi fi to test it for everything to find out what it is emitting?
I have got no reaction from the electrosmog detector to the equipment mentioned earlier.
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Post Time: 08/03/2008 22:21:15 |
topazg
Total Forum Posts: 13 |
No, we don't do that sort of testing, but the EMC test requirements for electronic equipment sold in Europe allow for only vanishingly small levels of EMFs - so if the equipment is CE marked, it is unlikely to be radiated interference. There are EMC labs around the UK that do this sort of testing, but it is very expensive (£1000+ per product).
It could be conducted interference (around the mains wiring). The best thing to do to stop that is to purchase a filter socket strip and plug all the HiFi equipment ito that. The same for the TV. The same for the computer. You need to get a high-frequency filter strip and not just a surge protector one.
N44FB 6-way from Maplin (£14.99), Operating voltage: AC 220-250 V,
Max. current rating: 13A, Max. surge current: 6500A,
Insertion Loss: 150kHz 62dB, 3 MHz 35dB, 30 MHz 30dB, 1 GHz 15dB
They also do a professional grade one with much higher levels of signal supression (including earth-born noise). L07BK at £39.99
Although intended to protect the equipment, these strips work the reverse way as well and prevent mains-borne interference from travelling around your home wiring from the equipment.
Alasdair Philips (signed in as topazg on another computer)
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