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13. Extension kit specifications for the power amplifiers DPA 4120 / DPA 4140
13.1 NRS 90225 standard input module
see specifications DPA 4120 / DPA 4140
13.2 NRS 90222 remote module
see specifications DPA 4120 / DPA 4140
13.3 NRS 90208 input transformer for floating, balanced input
frequency response 20 Hz .. 20 kHz
input impedance t 10 k ohms
idling ratio 1:1
winding resistance; primary 1420 ohms at 20°C
winding resistance; secondary 1420 ohms at 20°C
13.4 NRS 90227 output transformer for floating, balanced monitor output
frequency response 40 Hz .. 20 kHz
nominal load impedance t 600 ohms
idling ration 1:1
winding resistance; primary 18 ohms at 20°C
winding resistance; secondary 18 ohms at 20°C
13.5 NRS 90224 pilot tone & ground fault surveillance
13.5.1 pilot tone surveillance
pilot tone frequency 19 kHz ± 1%
error recognition threshold d 12 mV
fault message output via NRS 90225 collective fault message via READY relay
fault message output via NRS 90222 PROMATRIX manager DPM 4000
13.5.2 ground fault surveillance
input loudspeaker line 4 ohms / 50V / 70V / 100V
fault message output via NRS 90225 collective fault message via READY relay
fault message output via NRS 90222 PROMATRIX Manager DPM 4000
disruptive strength 1000 Veff
error recognition threshold d 50 k ohms