Meinberg FDM511 - Manual (Page 6)

6
The Front Panel Layout
The 61mm wide front panel contains four LED indicators, two push buttons and a 8-digit
alphanumerical LED display.
LED PL Time
This LED toggles once per second when the mains
frequency is detected correctly. It stops toggling as
soon as the mains frequency fails.
LED REF Time
This LED toggles once per second corresponding to
the pulse per second of the reference. It stops togg-
ling as soon as the PPS is not applied any longer.
LED Fail
This LED is switched on whenever a correct
operation of the module is not ensured and the
results are useless. Loss of the PPS, the mains
frequency or the serial time string can cause this.
The reason for the fault can be found out by reading
the Error-Bits.
LED Overflow
This LED is switched on whenever one of the measurements exceeds its limits:
- Time Deviation is more than ±100 seconds
- Frequency is below 45Hz or above 65Hz
- Analog Output exceeds ±2,5V
The LED is switched off again as soon as all values are back within their limits.
Push Buttons
Measurement and status information can be selected to be shown on the display using the
two push buttons. The Menu button is used to skip to several sub menus while the Set
button is used to select the corresponding item and display its content. In the setup menu
the push buttons are also used to change the configuration of the FDM511 or to enter
parameters.
Display
The 8-digit alphanumerical LED display shows the measurements of the FDM511 like
frequency and time deviation. Furthermore, in the setup menu the display is used to show
configuration parameters and status information.