EMF measurement

In fact, probes should not perturb the electromagnetic field and must prevent coupling and reflection as much as possible in order to obtain precise results.

A mono-axial, omnidirectional probe is a device which senses the Electric (short dipole) or Magnetic field linearly polarized in a given direction.

Using a mono-axial probe implies the need for three measurements taken with the sensor axis set up along three mutually orthogonal directions, in a X, Y, Z configuration.

There are other meters which can measure fields alternating at as low as 20 Hz, however these tend to be much more expensive and are only used for specific research purposes.

In fact, a passive receiving antenna collects energy from the electromagnetic field being measured and makes it available at a RF cable connector.

On the other hand, an effective solution is to transfer on an optical carrier, the electric (or magnetic) field component sensed with an active probe.