Battery powered amplifier
The power amplifier ensures that you get the maximum sound pressure level out of the Norsonic range of speakers. The built-in battery has an operating time of up to 90 minutes @ full power. Switching between mains and battery operation is seamless. Batteries are charged once mains is applied.
WiFi – no signal cable needed!
Nor282 can be connected to a wifi network or be set as an access point. The latter is useful for field application where you can establish a 1:1 connection to a Nor145, Nor150 or Nor850. From the instrument or the 850 software you take full control of the power amplifiers signal generator, equalizer and output level.
Remote hand-switch
A wireless remote hand-switch to turn on/off the noise signal is included.
Graphical equalizer
Thanks to the large colour display and the graphical equalizer it is easy to adapt the speaker’s frequency response to the room response to fulfill the requirements for difference between adjacent 1/3 octave bands as per ISO 10140-5 and ISO 16283-1.
Fixed spectrum adaption is made for the Norsonic range of speakers which easily can be adjusted to optimize the spectrum to the room response. Additionally, three user defined spectrum may be configured.
A low and high pass filter is added to prevent the speakers from frequency content outside the desired frequency range for BA testing. This is to prevent the noise signal causing the speaker cone to move with higher amplitude outside its design limits and wasted energy in the low frequency area.
For special use, all filtering can be turned off.
The output signal including the equalized spectrum shaping is displayed in real time on the colour display, including a separate bargraph on the top of the spectrum indicating the overall noise level.
Noise types
The built-in signal generator features White, Pink, Brown, 1/3 and 1/1 band pass filtered noise, Sinewave and STIPA. In addition is swept sine supported when connected to Nor850. Additionally, any signal may be connected to the signal input connector. The signal generator signals are also available on the BNC connector for optional connection to other equipment.
Other useful features
The output attenuator can be set to any level between 0 and -70dB. Unlike many other amplifiers on the market, the output attenuator is well protected from accidentally change. The attenuator is controlled by a rotary switch with well-defined steps. The step ratio may be user preset to 1, 3, 5, 6 or 10 dB.
The Nor282 is protected against defective / short circuited speakers and cables, overvoltage and overtemperatures. A built in two speed fan turns automatically off when the output signal is turned off, ensuring no interference when performing reverberation time measurements.
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