Abstract: A method and apparatus for nondestructive testing of a gas discharge tube (GDT) comprising: electrically connecting a first terminal of the GDT to a first port of a vector network analyzer (VNA); electrically connecting a second terminal of the GDT to a second port of the VNA; measuring S parameters with the VNA; determining GDT capacitance and insertion loss based on the measured S parameters; comparing the determined capacitance and insertion loss of the GDT with a threshold value to determine if the GDT is functional.

Abstract: A method and apparatus for nondestructive testing of a gas discharge tube (GDT) comprising: electrically connecting a first terminal of the GDT to a first port of a vector network analyzer (VNA); electrically connecting a second terminal of the GDT to a second port of the VNA; measuring S parameters with the VNA; determining GDT capacitance and insertion loss based on the measured S parameters; comparing the determined capacitance and insertion loss of the GDT with a threshold value to determine if the GDT is functional.

Abstract: The present invention is a grounded mast clamp current probe apparatus. The apparatus can have a current probe substantially enclosed by at least one housing. The housing forms an electrostatic shield that prevents passage of electricity to or from the current probe. A plurality of grounding elements are connected to the outer surface of the housing and radiate outwardly from the outer circumference of the housing. Each of the grounding elements radiates at a frequency angle ?, the angle formed between a longitudinal axis of the housing and a longitudinal axis of the grounding elements. The bandwidth and resonant frequency of the current probe is dependent on the frequency angle ?.