User`s manual

Advanced Configuration
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11.5 Calibrate System Clock of DR3
Sometimes the system clock of the DR3 need to be calibrated for accurate time
recording, it is important for the Lap Timer. If you need to calibrate the system clock,
click Calibrate System Clock button to calibrate the system clock of
DR3-S1mmediately.
After you click Calibrate System Clock button, Desktop will prompt you to get the
confirm again.