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The paper addresses the issue of measurement based power system load model development. The majority of power system loads respond dynamically to voltage disturbances and such contribute to overall system dynamics. Induction motors represent a major portion of system loads that exhibit dynamic behaviour following the disturbance. In this paper, the dynamic behaviours of an induction motor and a combination of induction motor and static load were investigated under different disturbances and operating conditions in the laboratory. A first order generic dynamic, load model is developed based on the test results. The model proposed is in a transfer function form and it is suitable for direct inclusion in the existing power system stability software. The robustness of the proposed model is also assessed.