MEASURING DEVICE, DIAGNOSTIC SYSTEM INCLUDING THE SAME, AND DIAGNOSTIC METHOD USING THE SAME

An embodiment provides a measuring device, including: a voltage measurer measuring a voltage from a node on a wire connected to a battery management system (BMS); and a controller that receives the measured voltage signal from the voltage measurer to derive a voltage value, counts the number of times the voltage value reaches a reference voltage during a measuring period, and determines a state of the BMS as one of a normal state of a first mode, a normal state of a second mode, and an abnormal state based on the number of times.