What is Disturbance Direction Detection (DDD)?
ION76XX, ION75XX, ION8XXX, and PM8000
Meters with the Disturbance Direction Detection Module can detect faults upstream and downstream of the meter. The module will give you a confidence level of where a disturbance in the line voltage or line current occurred in regards to the meter's location. For an in depth description of the Disturbance Direction Detection module please see the attached document.