Abstract: SynchronizerTimer is an important instrument of the Synchronizer/Data Buffer (S/DB) system for Command and Data Acquisition Station (CDAS).The device contains a highaccuracy digital phase locked loop that can precisely recover synchronizationbasic information from geostationary meteorological satellite cloud pictures.The Digital phase locked loop includes a phase comparator made up of high speed elements and a filter implemented by computer software.It applies standard frequency count mode and can complete the tracking of analog sun(highprecision sun pulse)and digital sun (scan synchronization digital),and measures the clock frequency on satellite,etc.At the same the microcomputer can server as a system manager.