Chapter 5 Operation
5300.9677.71 - 5.49 - EN-4
Permissible input amplitude
If the signal is greater than the nominal input amplitude, the internal limiter (if active) will
limit the frequency modulated (FM) signal. If the signal has a level that is greater than 280%
of the nominal input amplitude, the A/D converters are already overdriven and the signal
will be clipped. The Clipped warning is displayed.
Current input amplitude
The peak value of the signal amplitude is queried and evaluated every 10 ms. If the peak
value drops below the defined Threshold, a timer is started. The timer is reset as soon as
the signal rises again above the threshold. However, if the timer reaches the Off-Time error
limit, a warning is displayed. The warning remains until the signal amplitude is again above
the threshold. In this case, a timer is started which works in the same manner. The warning
disappears when the timer reaches the set On-Time.
Note Brief peaks up to 50 ms are suppressed by the control logic, i.e. the signal must be above
or below the threshold for at least 50 ms for the corresponding timer to be started or
stopped. This prevents undesired indications from being triggered by brief signal peaks.
Note By nature, any monitoring of analog signals must be based on the current input level; how-
ever, this is also highly dependent on the content of the transmitted signal. If longer pauses
occur, e.g. in a program playing classical music, we recommend increasing the Off-Time
value to prevent incorrect indications. As an alternative, you can shorten the time if you are
certain that no longer pauses will occur in the program.
2.7.2.2 Exciter > Input > Digital Audio Menu Window
In the Digital Audio menu window you can enter thresholds for digital audio.
Setting item Explanation
Digital Level For setting the nominal digital input amplitude; 0 dBFS corresponds to
full-scale amplitude of the digital signal
Value range: -12 dBFS to 0 dBFS (default setting -9 dBFS)
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