— 5 —
Fig. 3
⑴
Test socket
⑵
Terminal block
⑹
LCD
⑺
LED for test result
⑻
Start/Stop switch
⑼
Null/250V-500V
switch
⑽
Function switch
⑾
SELECT switch
3.3 Features
•
Warning for the appliance to be ON.
•
Selection for 250V or 500V on the insulation resistance test.
•
Null function for the protective conductor resistance test.
•
Warning for the over range value in the LCD.
•
Capable of judging pass/fail of tests by LED on the panel and by buzzer.
3.4 INSTRUMENTS LAYOUT
Terminal Block
⑿
⑶
⑷
⑸
⑴
Test socket
Insert the mains plug of DUT to this socket for the polarity test of protective
conductor resistance, insulation resistance and Leakage current test.