Meinberg FDM511 - Manual (Page 8)

8
Powering Up the System
If all the input signals, the power supply and the power line to be monitored have been
connected to the FDM511, the system is ready to operate. The "Fail"-LED as well as the
"Overflow"-LED are switched on after power up reset. FDM511 waits for the incoming
serial time string via COM1 to initialize the internal system time (REF time). When this is
done, the PL time is also initialized with the REF time and consequently, the time
deviation TD is set to +00.000s. From now on the REF time is incremented with the PPS
applied while the PL time is incremented by a certain number of recorded mains
frequency periods (50 or 60). The "PL" and "REF"-LEDs start toggling once per
second, corresponding to their time base. The Fail LED is switched off.
The Menus in Detail
After power-up, the type of the module and the firmware revision is displayed for a short
time. Successively, the following items appear before the display begins to shows the
mains frequency automatically:
Knowledge of the firmware revision is helpful whenever technical support from
Meinberg is needed. The Menu button is used to skip to the menus described in the
following. The corresponding content of the menu is displayed after selection is done
with the Set button.
Menu Frequency
The actual calculated mains frequency is displayed with a resolution of 0.001Hz. This is
the default content of the display after powering-up the module.