Potential gradient (PG) is measured using a BOLTEK EFM 100 Atmospheric Electric Field Monitor. It is mounted on a 3m metal pole surrounded by trees in a distance of ~ 15-30 m. Resolution of measured PG values: 10 V/m. The measurement is calibrated by the BOLTEK company. The official user manual suggests a calibration method aided by a second fill mill, which has not been performed yet.

The instrument is located at 153 m a.s.l.
Measurement frequency is ~2Hz

This is used in the Glocaem potential gradient network

Publication: Berlinski, J., Pankanin, G. and Kubicki, M. (2007) Large scale monitoring of troposphere electric field. In: Proceedings of the 13th International Conference on Atmospheric Electricity, August 13-18, Beijing, China, 124-126.