Importance

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Abstract

A light weight data recorder employs a non-volatile electronic memory to store several channels of data occurring before and after a triggering event. Data may be retained in the memory with the aid of a NiCad battery. Upon the occurrence of a triggering event, which may be user defined, the input of new data into the memory will be terminated after a selectable predetermined time has passed. This allows data to be recorded both before and after a specified event. The triggering event may be derived by sensing a change in the signal level of one of the data inputs by a predetermined amount, or it may be a specially generated signal. Once a triggering event has occurred, the data retained in memory is protected. Circuit means are provided to retrieve the stored data without destroying it. Another circuit permits recording of new data in the memory only after a unique signal has been detected.

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First Claim