INSULATION TESTER OF PRINTED CIRCUIT BOARD AND INSULATION TEST METHOD

摘要

An insulation testing device applies a direct current between circuit patterns (C1 to C4) of a print substrate and determines the failure of insulation state of the print substrate based on an applied voltage value and a resistance value between the circuit patterns. The resistance value is calculated from a current value flowing in the circuit patterns. The insulation testing device comprises; a current detection unit (7) which detects a current flowing in the circuit patterns by the application of a voltage; a current increasing detection unit (9) which detects whether a current value detected by the current detection unit (7) is increased over a predetermined value based on a spark generated between the circuit patterns within a spark detection time from voltage application start to voltage increasing completion; a spark determination unit (25) which determines a print substrate as a defective product if the current increase is detected by the current increasing detection unit; and a spark detection time setting unit (10) which can change prescribed hours. [Reference numerals] (10) Spark detection time setting unit; (12) Display device; (21) Memory; (23) Data communication unit; (25) Spark determination unit; (26) Insulation state determination unit; (3) Switch conversion control unit; (5) Applied voltage control unit; (6) Voltage detection unit; (7) Current detection unit; (8) Voltage increase completion detection unit; (9) Current increase detection unit