Scope of Measurement

 

During the past few years, I have focused my study on 0,1 Hz to 40 Hz frequency spectrum, measuring and recording the instant variations of the magnetic field and not its absolute value.

 

Unfortunately, in the vicinity of big cities, the levels of signals from natural sources are 1.000-30.000 times lower than those of signals transmitted by our technological civilization.  For this reason, the use of filters in the electronic circuit is imperative.