Siemens SIMEAS Q80 Operating Instruction page 118

E-42 SIMEAS Q80 7KG8080
10.3.2 Master/Slave setup
In the setups described here, all devices are synchronized to each other via DCF77. The clock rate is provided by a
master device synchronized to an external clock.
Note
10.3.2.1 No external timer
No external timer: Devices are synchronized with each other, but not synchronized to absolute time by an external
clock.
10.3.2.2 GPS receiver as timer
GPS receiver as timer: Devices are synchronized with each other and synchronized to absolute GPS time.
Power Quality Recorder SIMEAS Q80 7KG8080, Operating instruction
E50417-B1074-C419-A2, Release 09.02.2011
· If the synchronized devices are at different voltage levels, they should be compensated by
means of a lead having the appropriate cross-section. Alternatively, it is possible to isolate
the different voltage levels from each other.
· If there is an outage of the Master, all devices continue to work according to their own
internal clocks and drift apart in accordance with the precision stated in the
.
74
· If there is an outage of the external clock (GPS, IREG B or NTP), the Master continues
according to its internal clock. However, the devices remain synchronized to each other.
Example for synchronization with master and slave devices
Master device synchronized by GPS and slave devices
technical data