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Models T0S8750 and TOS8700 Withstanding Voltage Testers are for both AC voltage and DC voltage testing, with an AC output rating of 50Q VA. The TOS8750 is for an AC output of 5 kV, 100 mA (500 VA) or a DC output of 5 kV, 25 mA (125 W) , and the T0S8700 is for an AC output of 10 kV, 50 mA (500 VA) or a DC output of 10 kV, 10 mA (100 W), and can be used for withstanding voltage test in compliance with JIS, Electrical Appliance Control Ordinance, UL, CSA, BS and other major electrical standards and ordinances. They can be used for withstanding voltage test (dielectric strength test) of the various types of electrical and electronic equipment and components. The Testers have a G0-N0G0 judgement function, a test result output function, and a remote control function. The G0-N0G0 judgement function is with a window comparator system. It generates an NG signal when a leak current larger than the judgement reference value set on the front panel has flowed and it also can generate an NG signal when the detected current is less than 1/10 of the set value. With these features, G0-N0G0 judgement can be made including to some extent such abnormal states as open circuiting or imperfect contacting of test leadwires. Regarding the test result output function, the Testers deliver a test signal, a GOOD signal or an NG signal, all of which are contact signals. By employing the CONOCO judgement function in conjunction with the remote control function, an automated and labor-saving withstanding voltage test system can be realized. The Testers, which employ a hazardously high voltage, are incorporated with the various provisions for the safety of the operator and for protection of the Testers themselves against erroneous operations. The sequence circuit is designed to be free from erroneous operations caused by noise, making the Testers highly reliable instruments. This instruction manual is applicable to both T0S8750 and T0SS700, Read the items relevant to respective models.