EFFECTS OF AN INSULATING SUPPORT IN AC ELECTRIC-FIELD MEASUREMENT

This paper examines the effect of an insulating support which is essen tial for measuring field strength in the space. Various affecting para meters were analyzed for a model arrangement of a free-body meter put on top of a vertical insulating column, such as relative permittivity, dimensions of the column and the probe (field-sensing electrodes) of the meter. The paper also presents experimental and numerically calcul ated results for the output increase of a practical field strength met er caused by presence of a support. These characteristics were discuss ed with an equivalent diagram consisting of electrostatic capacitances and by considering the field distortion caused by the insulating colu mn.