Chapter 5 Operation
5300.9677.71 - 5.48 - EN-4
Signal monitoring at analog inputs
Nominal input amplitude
The nominal input amplitude is the signal amplitude (500 Hz sinewave signal) that produces
100 % of the set nominal deviation at the output of the FM modulator. The analog level reg-
ulators on the input side are set to ensure 9 dB headroom on the A/D converter at this am-
plitude.
Setting item Description
Impedance Selection of the input impedance; possible settings:
– 600 Ohm
–>2 kOhm
Level Setting the nominal input amplitude
Value range (analog): -6 dBu through +12 dBu (default setting +6 dBu)
Value range (MPX): -1 dBu through +16 dBu (default setting +6 dBu)
Threshold Setting for the input amplitude threshold for monitoring
The setting can be entered in two ways:
– as a percentage of the nominal input amplitude
in the value range: 2% through 80% (default setting 5%)
– as an absolute value in dBu
in a value range dependent on the absolute level, corresponding to
input as a percentage
Display Description
On-Time If the input amplitude is continuously above the threshold during the set
time interval On-Time, the input is considered to be OK.
Value range: 1 s through 6000 s (default setting 5 s)
Off-Time If the input amplitude is continuously below the threshold during the set
time interval Off-Time, the input is considered not to be OK.
Value range: 1 s through 6000 s (default setting 5 s)
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