| 摘要 |
A data logging apparatus which stores data relating the occurrence of events is provided. Such a data logging apparatus can be used in a utility meter which measures parameters relating to the meter. The data logging apparatus is arranged to receive a signal with at least one time varying parameter such as frequency, and logging the parameters with respect to the time varying parameter. A reference unit records the same time varying parameter against real time. A correlation is carried out between the data in the data logger and the reference unit. Such an arrangement obviates the need for a real time clock and the requirement to measure the parameter with respect to the real time at the data logger itself.
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