C. Probe performance
The probe measures both the field's amplitude and direction.
It is designed to measure DC-fields but it can also measure
AC-fields. The probe is designed to measure electric fields
from 10 V/mm. It can measure much lower fields if the signal
is properly filtered. Fields down to 0.1 V/mm have, for
example, been measured at 50 Hz. The upper limit is dependent
on the risk of a triggered breakdown in the air since the probe
raises the field with a factor of 2 to 3 times locally around the