How much data does the PEM hold?
Unlike other dataloggers, the PEM actually has two blocks of memory to store it’s data, that is, it has two buffers: • 30-minute buffer: contains the data collected at 30 minute intervals. • 4-hour buffer: contains the data collected at 4 hour intervals. The 30-minute buffer will hold about one year’s worth its data (taken at 30 minute intervals). The 4-hour buffer will hold about five years’ worth of data taken at 4 hour intervals. When you copy data from the PEM onto the SRAM card, you automatically copy the contents of both the 30-minute and 4-hour data buffers into one file. Each buffer is approximately 64KB in size, so combined they total roughly 128KB. Later on, when you are working with PEM data or Climate Notebook software to view the data, you will have to choose which data buffer you want to work with. The 30-minute buffer will give more detail but, as time goes on, a lot of data will be accumulated. After a year, the 30-minute buffer will contain 17,530 data points (the numb
