1. A sustained deviation of the controlled variable from set point. This characteristic is inherent in proportional controllers that do not incorporate reset action. 2. Offset is caused by load changes. 3. The steady state deviation when the set point is fixed. NOTE: The offset resulting from a no load to a full load change (or other specified limits) is often called “droop” of load regulation.” 4. A constant and steady state of deviation of the measured variable from the set point.