Meinberg FDM511 - Manual (Page 9)

9
Menu Frequency Deviation
This menu, choosen with the Set button, shows the deviation of the mains frequency
from the nominal frequency (50 of 60Hz). The frequency deviation is a signed value
with the same resolution and accuracy of the mains frequency.
Menu REF Time
The time, provided by the reference, is shown in this menu.
Menu PL Time
The power line time is displayed when this menu is selected. The PL time is set to the
REF time after a power-up reset and thereafter is clocked with the mains frequency as its
timekeeping reference. Therefore, time jumps, like changeover in daylight saving or leap
seconds, will not be executed!
Menu Time Deviation
The time deviation is the difference between the exact REF time and the drifting PL time.
The displayed value is signed, has a resolution of 1ms and is limited to its maximum of
±99.999s. If this limit is exceeded, an error bit is set (see "Error Bits") and the
"Overflow"-LED is switched on. The time deviation is set to +00.000s after power-up
reset, but can be set to any preset value via the Setup Menu "TD Init". The long-term
accuracy of the time deviation is equal to the pulse per second from the reference.