Norsonic Nor275, Пользовательская документация

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Using Nor280 with the speakers Nor223/229/275/276
The power amplifier Nor280 is extremely powerful, so care must be taken not to destroy loudspeaker systems connected
to it. The below table provides an indication of maximum permissible amplifier input signal. Max input signal to the ampli-
fier is 1 Vrms. The following settings should NOT be exceeded:
Signal type Nor223
)1
Nor229
2)
Nor270/270H/250 Nor275/276
White/pink noise 0 dB –3 dB 0 dB 0 dB
Octave & third octave filtered
pink noise, f< 200 Hz
–3 dB –6 dB –3 dB 0 dB
Octave & third octave filtered
pink noise, f> 200 Hz
0 dB –3 dB 0 dB 0 dB
Red/white noise with
equalisation On/Off
–3 dB/0 dB –6 dB/–3 dB –3 dB/0 dB 0 dB
All dB values are dB re. 1Vrms
)1
assuming an impedance of 5.4 Ω
2) assuming an impedance of 6
Ω
The frequency response of the equalisation
circuitry of the Nor280 Power Amplifier
Noise Generator
The built in noise generator is a random type with a
repetition period in excess of 4 hours. It features 3
different noise types; Pink, Red/White and White. The
output can be attenuated in 5 dB steps by the level
selector from 0 to –35dB in addition to signal off.
Connecting other noise generators than found in
Norsonic sound level meters may damage the loud-
speaker. If usinger other sources, make sure the maxi-
mum output voltage of the noise generator is 1,0 Vrms.
Higher voltage will damage the speaker.
Wireless remote control
Option 1, wireless remote control of signal on/off, ena-
bles the user to control the on/off without being present
in the source room. The output to the speaker can be
switched on/off from the small remote hand switch.
Typical range is 100m in free field but will also transmit
20 db
0 db
-20 db
20 Hz 100 Hz 1 k
4 k
Frequency (Hz)
through a concrete wall/floor. The remote on LED indi-
cation is normally illuminated. The remote on indicator
is turned off if the output is switched off from the remote
switch.
15 Noise Excitation Systems