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The BL-III zinc oxide lightning arrester test instrument is the instrument used on-site and laboratory examining, widely used in the zinc oxide arrester on-line monitor (electriferous test) and the laboratory test (with power failing test). It matches the People's Republic of China electric power profession standard's requirement 《the DL474.5-92 insulates experiment-the arrester experiment》. This instrument uses micro-computer technical on an advanced technique of sample, control and etc., can measure the zinc oxide arrester under the power frequency voltage of whole currents, three harmonic waves, resistance currents, the resistance current peak value, capacitive current and active power etc. Display the wave of the voltage, current and print. Use the big screen LCD display, the menu hints the operation, making the MMI function stronger. Provides the display of connection on-site line at the meantime. This instrument has the advantage characteristics of simple connection line, high measure accuracy, strong dependability etc.