Test for cord sets, two-core wire and three-core wire.
1. Power source：AC 220V, 50Hz
2. Test voltage：AC 24V
3. Test item : conduction & polarity.
4. Alarm prompt : Sound and light alarm.
a. Qualified products have sound and light prompts, b. When open circuit the corresponding LED is not lit. c. When the electrode impedance is less than 200KΩ, instrument have sound and light alarm.
