User`s manual

Advanced Configuration
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When system clock of DR3 be calibrated & rebooted, LCD on DR3 will display
correlative status information.
11.5.1 Calibrate System Clock of DR3-S1
After the system clock of DR3-S1s calibrated successfully, the DR3 will restart again.
11.5.2 Calibrate System Clock of DR3-X1
After the system clock of DR3-S1s calibrated successfully, the DR3 will restart again.