Nor275
Hemi-dodecahedron Loudspeaker
Nor276
Dodecahedron Loudspeaker
Nor280
Power Amplifier
user documentation
noise excitation
equipment
Noise Excitation Systems
Noise Excitation Equipment – August 2009 Edition
Nor275/Nor276/Nor280 User documentation
ImNoiseExitation_1Ed1R0En
Norsonic is a registered trademark of Norsonic AS. All other
brand or product names are trademarks or registered trademarks of their respective companies.
Every effort has been made to supply complete and accurate
information. However, Norsonic AS assumes no responsibility
for the use of – nor for the consequential damages of the use of
– this information and/or the instrumentation described herein.
Furthermore Norsonic AS assumes no responsibility for any
infringement of the intellectual property rights of third parties,
wherever applicable, which would result from such use.
Norsonic AS reserves the right to amend any of the information
given in this manual in order to take account of new developments.
If you wish to communicate with us, our address is:
Norsonic AS, P.O. Box 24, N-3421 Lierskogen, Norway
Tel: +47 3285 8900, Fax: +47 3285 2208
Find us on the web:
www.norsonic.com
e-mail: info@norsonic.no
Copyright © Norsonic AS 2009
All rights reserved
07 Nor275
Hemi-dodecahedron Loudspeaker
08 Nor276
Dodecahedron Loudspeaker
12 Nor280 Power Amplifi er
Contents
0
7 Nor275
Hemi-dodecahedron Loudspeaker
0
8 Nor276
Dodecahedron Loudspeaker
10'4"
16'8"
Hemi-dodecahedron
Loudspeaker Nor275
A powerful sound source designed for building acoustics measurements per ISO 140-4 Annex A (Field measurements), ISO 354, ASTM E-90, E-336. The source
provides uniform sound radiation. When used with the
power amplifi er Nor280 the high sound power level
ensures accurate descriptors in measurement conditions that include high background levels, high sound
insulation properties and large room volumes.
The Nor280 power amplifi er comes with an equalisation circuitry that can be switched on or off, designed
to boost the high and low frequencies to improve the
Nor275/280 system performance.
The loudspeaker is desinged to operate at full power
for more than one hour continuously.
Specifi cations Nor275
Physical design Hemi-dodecahedron
Sound power output: Using the Nor280 with pink
noise, and equalisation:
120 dB (Lin)
Speakers: 6×6”
Power (broadband):
100 W
RMS
(maximum)
Peak 500 W
Impedance: 5.3 Ω
Diameter: 332 mm (13”)
Height: 175 mm (6,9”)
Weight: 6 kg (13,2 lb)
Accessories included: Speakon NL4FC plug;
5m assembled cable,
if ordered with Nor280
NOTE: The Nor275 is designed to be used
with Nor280 Power Amplifi er only. Using other
amplifi ers may damage the speakers and will
void the warranty.
Typical sound power level vs. frequency of the loudspeaker Nor275
when used with the pink noise source and equalizer included in the
power amplifi er Nor280.
7
Noise Excitation Systems
Dodecahedron
Loudspeaker Nor276
A multitude of applications within the field of building
acoustics requires the use of isotropic sound sources.
The loudspeaker Nor276 has been designed to comply with these requirements and satisfies the ISO 140-3
Annex C (Laboratory measurements), ISO 140-4 Annex
A (Field measurements) and ISO 3382-1.
The speaker come with a tripod ensuring correct
placement so that unwanted reflections and structural
transmissions are kept at a minimum.
The rugged speaker cabinets are made of fibre glass
and the speaker elements themselves are protected by
grids to further enhance the concept.
Connecting to a Power Amplifier
The Nor276 as been designed for continuous operation
for more than on hour at full power.
The speaker input socket accepts Speakon NL4FC
connectors – see overleaf for more on this.
A mounting rod (Ø=1”) makes tripod mounting easy
and safe.
Specifications Nor276
Physical design Dodecahedron
Sound power output: Using the Nor280 with pink noise,
and equalisation: 120 dB (Lin)
Speakers: 12× 6”
Power (broadband):
200 WRMS
Peak 1000 W
Impedance: 2,7Ω
Diameter: 332 mm (13”)
Weight: 9 kg (19,8 lb)
Tripod mounting-rod : 1” diameter
Accessories included: Speakon NL4FC plug;
5m assembled cable,
if ordered with Nor280
Tripod
NOTE: The Nor276 is designed to be used
with Nor280 Power Amplifier only. Using other
amplifiers may damage the speakers and will
void the warranty.
8
User documentation
Maximum and minimum directivity indices in different directions
according to the requirements in ISO 3382-1 compared to the
tolerance limits.
Maximum and minimum directivity indices in different directions
according to the requirements in ISO 140-3 and ISO 140-4 compared
to the tolerance limits.
Typical sound power level vs. frequency of the loudspeaker Nor276
when used with the pink noise source and equalizer included in the
power amplifier Nor280.
100 Hz
315 Hz
1 kHz
3,15 kHz
Sound power in different directions for Nor276. The measurement is
done in a horizontal plane through the centre of the loudspeaker. The
graph shows the respons for a sinusoidal signal at 100 Hz, 315 Hz, 1
kHz and 3,15 kHz.
315 Hz 1 kHz
3,15 kHz
100 Hz
9
Noise Excitation Systems
The loudspeaker unit MUST be placed on tripod
before excited.
The speaker pointing to a flat surface /floor will
be damaged if excited when placed directly on a
floor or other flat surfaces.
Warranty of the loudspeaker is void if excited with other power amplifiers than Norsonic Nor280 and a
Norsonic sound level meter.
Caution !
10
User documentation
If you need to assemble cable and the Quick
Lock connector, connect as follows:
1+ and 2+ are to be connected together.
1– and 2– are to be connected together.
Insert...
1. Insert
2. Turn right (locks automatically),
contact is made after turning
Remove...
3. Pull lever
4. Turn left
5. Pull plugg
Strain relief bushing
– don’t loosen!
The Nor275/Nor276 Quick Lock connector…
LIE CHTENSTEIN
2.
1.
5.
3.
4.
11
Noise Excitation Systems
Power Amplifier
Nor280
The Nor280 is a rugged, lightweight and powerful class
D amplifier. It is specially designed for building acoustics applications.
The amplifier comes with a built in noise generator as
standard and as an option it can be fitted with a wireless
remote control for switching the signal on/off.
To optimise the power where it is needed a unique
built in equalization network compensates for the
falling frequency response of the speaker system in
both the low and high frequency areas. A part of the
amplifiers input stage is a high pass filter that removes
low frequency signals that lie below the required
frequency range for building acoustic measurements
and a low pass filter that removes all frequencies above
12kHz. This feature protects the speakers from distortion
and concentrates power into the frequency bands
where it is needed.
The output of the amplifier is short circuit protected
and an automatic system will guard against overheating
and high signal voltages through the input. The built
in cooling fan is normally not required but will run at
high room temperatures or during prolonged use of the
amplifier at full power. It will however, immediately switch
off when the input signal goes off; this feature makes
the unit well suited to reverberation measurements in
areas of low background noise.
Front panel layout
The front panel consist of a source selector, a level
attenuator, a switch selecting the equaliser on/off, input
and output connectors, mains connector, mains fuse
and switch, an error indicator and a remote indicator.
Source selector
The Source selector has four positions:
• Line. Selects the input signal connector and disconnects the internal noise generator. This allows the
use of an external signal source. Input sensitivity is
1 Vrms for full power output when using Norsonic
speakers.
• Pink. Selects pink noise from the internal noise
generator.
• Red /White. Selects Red/White noise from the internal
noise generator.
• White. Selects White noise from the internal noise
generator.
12
User documentation
Front panel of Nor280
Level selector
The Level selector attenuates the output level in 5 dB
steps from 0 dB (full power) to 35dB. The final position
switches the signal off.
Equalizer switch
The equalizer switch selects the equalization network
on/off. The switch should be left in the on position when
using Nor250, Nor270, Nor270H, Nor275 or Nor276
loudspeakers for maximum power to the speaker
system. It also ensures that there is less than 5 dB
between each adjacent 1/3 octave band (free field
conditions) when using any of the above mentioned
speakers, as required by annex C in the ISO140/3
standard.
The equalization network is adapted to the Nor275,
Nor276 loudspeakers. When using other speakers, it
is recommended to switch the equalizer off, or use the
network with care in order not to damage the speaker.
The high and low pass filter is always a part of the signal
path regardless of the setting of the equalization switch.
Error indicator
The error indicator is illuminated and the output signal
is turned off when one of the following error conditions
occurs:
Indication of remote
control status
– signal On/Off
Selector for
output level.
The equalizer circuit
may be switched
On/Off
Signal source
selector
Fuse compartment
Mains power switch
Hand swich programming
Error indicator
Indicates overload
and shutdown due to
over-temperature
Signal input
connector
Output connector
(loudspeaker)
Mains connector
13
Noise Excitation Systems
• Short circuit. If the output current exceeds 35Amp
due to a short circuit of the output stage or a speaker
system with a nominal impedance less than 2 ohm is
connected.
• Over temperature. If the temperature exceeds the
temperature limit, the amplifier is turned off and the
cooling fan is turned on at full speed.
The signal is turned on again as soon as the error
condition is removed.
Please note that the fan is turned on if the temperature inside the amplifier exceeds 35 ºC and the input
signal exceeds 100mVrms. The amplifier however is
still well suited for reverberation time measurements in
areas of low background noise since the fan is turned
off when the input signal drops below 100mVrms.
Remote on LED
The “remote on” LED indication is normally illuminated. If
the wireless remote on/off control option is added, the output to the speaker can be switched on/off from the small
remote hand switch. The remote on indicator is turned off if
the output is switched off from the remote switch.
Input connector
The input connector is a 3 pin female XLR. The input
stage is balanced in order to remove influence from
external noise such as hum and crosstalk. A BNC to
XLR adaptor is a part of the delivery schedule. It is
recommended to use a XLR cable from the Nor280 to
the external signal, and convert it to a BNC or other
single ended cable system as close to the signal source
as possible. This ensures a minimum influence from
external hum and noise.
Output connector
The output connector is a 4 pole Speakon NL4MP type.
1+ and 2+ are connected together to form the + output, and 1- and 2- are connected together to form the –
output.
Connecting to a speaker
Connect the amplifier to the speaker. Connect the
signal input to the amplifier or select the noise source. Set
the signal attenuator to off. Switch on the amplifier and increase the signal to the desired leve. Precaution should be
taken against hearing loss – wear hearing protectors!
Power output vs input voltage
The input sensitivity when connected to a Norsonic speaker is 1.0 Vrms. This give a power output to the speaker
of about 100 Wrms for the Nor275 and 200 Wrms for the
Nor276.
If higher power is required for other speakers than
Norsonic, the input voltage to the amplifier may be
increased. Max. utput power is 500 Wrms/250 Wrms
in 4/8 ohm. This correspons to a input level of appr. 2
Vrms.
0 dB on the input attenuator/noise generator correspons to 1 Vrms.
Warning: The balanced speaker outputs are
both “hot” with a common DC voltage separate
from ground. Shorting one of the terminals to
ground results in an over-current situation.
Caution ! Consult the table on page 15 for
selecting the level of the noise. If your speaker
is not listed, precaution must be taken in order
not to damage the speaker system.
14
User documentation
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 amplifier 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 a n impedan ce of 5.4Ω
2)
assuming a n impedan ce of 6Ω
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 loudspeaker. If usinger other sources, make sure the maximum 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, enables 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 indication is normally illuminated. The remote on indicator
is turned off if the output is switched off from the remote
switch.
15
Noise Excitation Systems
Specifications
Output: Short circuit and over temperature protected
Output connector: Speakon NL4MP
Output power: 500Wrms (4ohm) and 250Wrms (8ohm) measured as
THD+N<0.1%.The built-in LP and HP filters ensure that the
output power matches the Norsonic Nor275 and Nor276
series of dodecahedron loudspeakers.
Peak power: >1 kW
Output current: Maximum 35 A
Input: Balanced input to avoid ground loops and cross talk to
signal cables
Input sensitivity: 1V (0dB) equals to 100w in 5Ω
Input impedance: 10k ohm//220pF
Input connector: 3 pin female XLR
Weight: 3,5Kg (7,7 lb)
Dimensions: 275 x 110 x 246 (mm) (D x W x H)
11 x 4,3 x 9,7 (inch)
Operating
temperature: -20 to + 35 °C
Operating
humidity: 0-90 %RH
Enclosure class: IP20
Mains voltage: 220Vac (190 - 265Vac, 45-55Hz) or
110Vac (90 - 132Vac, 55-65Hz).
Mains fuse: T 3,15A for 220Vac and T 6A for 110Vac
The unit is only safety approved using the following fuses,
as appropriate:
Wickman 181 1630 000 (1000pcs) or 002 (10 pcs) (110V) or
Wickman 181 1315 000 (1000pcs) or 002 (10 pcs) (230V)
Programming the hand switch
The remote hand switch is pre-programmed
for the supplied Nor28 0. Seve ral hand
switches can be programmed for one or
more amplifiers or vice versa. The procedure
is as follow:
• Switchontheamplier.
• Pushasmallrod(paperclip)intothe
tiny hole located to the right above the
mains switch. This activates a push
button
• Pressandreleasethebuttonlocated
on the remote hand switch
• Repeatthepressandrelease
• Wait20seconds
• Thehandswitchisnowprogrammed
to the new Nor280
Ordering information
Option 1: Wireless remote on/off
switch (must be specified when
ordering)
EMC and safety standards:
EN55103-1, EN55103-2, IEC61340-5 part 1&2, IEC61010, FCC part 15b class A
Licence Exemption:
Europe: The transmitter encoders use ECM compliant radio transmitter modules and complies with ETSI330-220 and ETSI300-683.
USA: The device comples with part 15 of the FCC Rules
Operation is subject to the following two conditions:
1. The device may not cause harmful interference, and
2. This device must acceptany interface received, including interference that may cause undesired operation.
Schedule of parts
Mains input lead, BNC to XLR female adapter, Output connector or a complete assembled cable 5m if ordered with a Norsonic
Nor250, Nor270 or Nor270H dodecahedron speaker. User manual with conformance certification.
16
User documentation
NORSONIC WARRANTY STATEMENT
All Norsonic labeled products are, unless other stated, warranted against defects in material and or workmanship
for 36 months from date of delivery.
Any equipment that may be defective should be returned to Norsonic AS carriage paid and Norsonic AS or their
approved local agent who will at their discretion repair or replace equipment that proves to be defective during
the warranty period. This warranty includes labour and parts only with any return carriage being for the customers
account.
Repair due to misuse of the equipment, fair wear and tear and/or use of non approved third party hardware, software or interfacing is not covered by this warranty, Batteries (dry cells or rechargeable) or other consumable items
are not covered by this warranty.
No other warranty is expressed or implied, including but not limited to, the implied warranties of merchantability
and fitness for a particular purpose.
Norsonic AS shall not be liable for consequential damages arising from either the use or the interpretation of the
results from the equipment.
17
Noise Excitation Systems
Declaration of Conformity
We, Norsonic AS, Gunnersbråtan 2, Tranby, Norway, declare under our sole responsibility that the
product:
Nor275; Nor276; Nor280
to which this declaration relates, is in conformity with the following standards or other normative
documents:
Performance complying with:
EMC and safety standards: EN55103-1, EN55103-2, IEC61340-5 part 1&2, IEC61010, FCC part 15b
class A (Nor280 is only safety approved using the specified fuses)
The optional remote control transmitter use ECM compliant radio transmitter modules complies
with ETSI330-220 and ETSI300-683 and part 15 of the FCC Rules, as applicable (see Specifications)
This product has been manufactured in compliance with the provisions of the relevant internal Norsonic production standards. All
our products are tested individually before they leave the factory. Calibrated equipment—traceable to national and international
standards—has been used to carry out these tests.
This Declaration of Conformity does not affect our warranty obligations.
The declaration of conformity is given according to EN 45014 and ISO/IEC Guide 22.
Norsonic AS, P.O. Box 24, N-3421 Lierskogen, Norway
Tranby, May 2009
Dagfinn Jahr
Quality Manager
P.O. Box 24
N-3421 Lierskogen
Norway
Tel: +47 3285 8900
Fax: +47 3285 2208
info@norsonic.com
www.norsonic.com
Norsonic AS supplies a complete range of instrumentation for acoustics – from sound calibrators, microphones
& preamplifers; via small handheld sound level meters to advanced, yet portable, real time analysers, but
also building acoustics analysers and complete community, industry and airport noise monitoring systems.
Contact your local representative or the factory for information on our complete range of instrumentation.
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