I have discovered that different cells give very different results when tested for EMF.
Using an Android app (EMF Sensor Free).
Initially I thought that worse cells (*fire) measured much higher levels.
What is going on here ?
What is it measuring, and is it of any significance in relation to cell charge or quality ?
Is it worth doing some proper testing ?
You got me. I googled and I read and I did get confused. Does you know who understand any of this or do you keep quite?
I have a gauss meter, but have not measured cells (chargers are more interesting to measure). I don’t see how a phone app can properly measure as it’s electromagnetic fields?
Smartphones do have magnetic sensors (3D compass), but what exactly you get from measuring a battery I do not know.
gauss=magnetic field.
Radio waves=electromagnetic field
The relationship between batteries and Electromagnetic field is at best very tenuos. All electric currents flowing create an Electromagnetic field. If the battery isn’t providing power to a device, the only field will be the distortions to the local field caused if the battery case is made of a ferro-magnetic or dia-magnetic material. The local field is caused by all sorts of things ranging from the household wiring, to the Earth’s magnetic field(and just about everything in between). In general the local field measurement is pretty meaningless unless you happen to be in the same room with an MRI scanner. I am extremely dubious of its value in determining anything about a battery except perhaps if the case material is made of a ferromagnetic material. To put this all into perspective, there are some really potent magnetic fields these days. A current generation MRI machine has 30,000 Gauss (3T) field. The local field is typically measured in milli-Gauss (1/1000 of a Gauss). For reference the earth’s magnetic field is right around .5 Gauss, or 500 milli-Gauss.
So I am extremely dubious that the reading from the ap is useful for anything more than your amusement.
I tried the free EMF app on my phone. It doesn’t seem to be sensitive to any electronic equipment. >.< I think if you’re interested it measuring such fields you are better off buying a dedicated meter.