A diagnostic apparatus includes an acquiring unit that acquires state information indicating an operational state of a motor for driving a shaft of a machine tool; a sensor that measures a physical quantity indicating an environment of the machine tool; a storage unit which stores a normal range of the state information corresponding to a value of the physical quantity; and a judging unit that, when the state information acquired by the acquiring unit is not within the normal range of the state information corresponding to the value of the physical quantity measured by the sensor, judges that the machine tool has an abnormality.

A signal analyzer for analyzing an input signal comprises at least one input for receiving the input signal, at least one acquisition unit for acquiring data assigned to the input signal, an acquisition memory for storing the acquired data, the acquisition memory being adapted to store data in at least one ring buffer, and an acquisition memory controller to control at least one of writing the acquired data in the acquisition memory and reading the acquired data from the acquisition memory. The acquisition memory controller comprises a data read module for reading data of the at least one ring buffer. The acquisition memory controller comprises a copy write module which taps data read by the data read module. The acquisition memory comprises an additional memory section. The copy write module is configured to write the data tapped into the additional memory section. Further, a method of processing data from an input signal is described.

A signal analyzer for analyzing an input signal comprises at least one input for receiving the input signal, at least one acquisition unit for acquiring data assigned to the input signal, an acquisition memory for storing the acquired data, the acquisition memory being adapted to store data in at least one ring buffer, and an acquisition memory controller to control at least one of writing the acquired data in the acquisition memory and reading the acquired data from the acquisition memory. The acquisition memory controller comprises a data read module for reading data of the at least one ring buffer. The acquisition memory controller comprises a copy write module which taps data read by the data read module. The acquisition memory comprises an additional memory section. The copy write module is configured to write the data tapped into the additional memory section. Further, a method of processing data from an input signal is described.

A diagnostic apparatus includes an acquiring unit that acquires state information indicating an operational state of a motor for driving a shaft of a machine tool; a sensor that measures a physical quantity indicating an environment of the machine tool; a storage unit which stores a normal range of the state information corresponding to a value of the physical quantity; and a judging unit that, when the state information acquired by the acquiring unit is not within the normal range of the state information corresponding to the value of the physical quantity measured by the sensor, judges that the machine tool has an abnormality.