DATA LOGGER AND VIBRATION MEASUREMENT SYSTEM

PROBLEM TO BE SOLVED: To provide a data logger that can input and output a signal for time correction to the outside, and at the same time, to provide a vibration measurement system that can easily correct the time of other data loggers by one data logger at low costs. SOLUTION: A data logger 1 is a portable recording device being accommodated into a case that is approximately of the size of B5 paper, is connected to a detector 20 for detecting vibration through a cable 40, and records measurement data on vibration (earthquake). Also, a GPS(global positioning system) receiver 3 can be incorporated into the data logger 1. In this case, the time of a clock 14 is corrected based on a time signal in a GPS signal being received by the GPS receiver 3 or the like, and at the same time, the time signal is outputted to other data loggers. Also, when the GPS receiver 3 is not incorporated into the data logger 1, the time signal being outputted from other data loggers is inputted for correcting the time of the clock 14.