Measurement of the Dielectric Constant of Polymeric Films at High Fields

摘要

A generalized method for measuring the dielectric constant of a film at highapplied fields is outlined. By using a low output impedance generator and a zero input voltage charge amplifier, a three-terminal configuration becomes possible. This method allows a complete specimen shielding. It also removes from the measured parameters any influence of the connecting leads. The measurement advantages of using a charge amplifier are discussed. A design for the charge amplifier is given that provides good immunity from any damage if the sample should experience an electrical breakdown. An extensive error analysis of the method is provided. Results are presented that show data with an uncertainty of <1% are possible in well defined samples.