Diagnostic apparatus, apparatus, computer readable storage medium, and control method of diagnostic apparatus

The invention relates to a diagnostic apparatus, an apparatus, a computer readable storage medium, and a control method of the diagnostic apparatus. A diagnostic device that is mounted on a device and diagnoses the state of the device is provided with a timing determination unit that determines the timing at which the diagnostic device diagnoses the state of the device. The period determination unit determines a period such that the duration of the diagnostic time interval in the first period is equal to or less than a first reference value and the duration of the diagnostic time interval in the second period is greater than the first reference value. The first period and the second period do not overlap in time. The diagnostic device may be provided with a mode determination unit that determines the mode of the diagnostic device. When the mode determination unit determines that the diagnostic apparatus is operated so as to periodically diagnose the device, the time determination unit can determine the time s