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For Sepam series 20, 40, 60, and 80 RTC (Real Time Clock ), the time accuracy drift without any time synchronization is 25ppm (parts per million) at a normal operating temperature range stated in the manual. It means, in a day, 25ppm x 3600 x 24 = 2.16 seconds per day, in a year that is 13.14 minutes.
This means, if the PME can send several time-synch signals per hour (maximum allowable for PME to send), Sepam will be very accurate.