PURPOSE: To obtain an automatic tester for a filter pin connector for accurately and promptly measuring insulation resistance, capacitance and high frequency damping of a filter pin connector.

CONSTITUTION: An automatic tester for testing a filter pin connector uses an insulation resistance tester 102 for testing insulation resistance of the filter pin connector, a capacity meter 104 for measuring capacitance of a pin contactor of each filter pin connector, a signal generator 100 and a radio frequency(RF) microvolt meter 106 for measuring damping of a pair of pin contactors of a test signal supplied by the signal generator 100. A testing fitting member 110 contains a pair of radio frequency multiplexers 112, 113 and a high pressure multiplexer 115 for supplying a signal line between each pair of pin contactors and the tester. A microprocessor 120 controls the tester and multiplexer for measuring insulation resistance, capacitance and signal damping of each pair of pin contactors.