Timestamp in the log file of Bird Virtual Power Meter VPM3

The timestamp in the log file is the time when that measurement was received from the sensor, and depending on the sensor in use, this time can vary. If an interval is set for logging data, new measurements will not be written faster than this interval, but the exact time the measurements are received from the sensor will still be random relative to the logging interval, and if the measurement rate from the sensor is slower than the requested interval, that will limit how fast you can log.