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GPS Sync Box
Located inside every power meter is a Real Time Clock (RTC) which accurately keeps tracks of Coordinated Universal Time (UTC) since the last sync took place with a GPS Sync Box.
The RTC is accurate to ±0.432 Second/Day over the entire temperature range from -45°C to +85°C. In other words, the RTC will drift no more than ±0.432 over the course of 24 hours, even if the temperature varies significantly throughout the day.
We have defined it such that a sync will be considered expired if 6 hours or more have elapsed since that sync occurred. This equates to a worse case drift of ±0.108 seconds which closely lines up with the 100Hz High Speed Data sampling period of 0.100 seconds.
Searching for an active GPS Sync Box consumes power, so we want to limit the time the power meter spends searching for one. If the power doesn't currently have a valid sync, then it will start search more frequently - more specifically, the power meter will begin a short search (for 5 seconds) every 60 seconds.