"The 887 PR is a 3 Phases Presence and Rotation Indicator. It does not need any battery as it derives it's power from the system under test. It can be utilized on a 3 Phases Powered System without having to worry about damage to the tester or the system. Once connected to a 3 phase power system, it indicates the Phase presence by showing it's corresponding LCD symbol. It displays the rotation (clockwise or anti-clockwise) on the LCD."

技术参数