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Building acoustics measurements with the Nor145 (1ch)
The Nor145 sound level meter is designed for various applications.
The building acoustic mode turns it into a powerful and easy to use instrument for sound insulation measurements featuring on board Project management and evaluation in accordance with ISO 16283-1/-2/-3 as well as national standards.
Nor145 can be used as a manually operated building acoustic analyser, or as a remotely controlled building acoustic frontend for the Nor850 multichannel system.
About
The Building Acoustics mode is designed to cover any in-situ sound insulation measurement tasks. You may choose to measure airborne, facade or impact sound insulation. The measurement, the averaging and the evaluation – right up to the calculation of the single number information such as the building sound insulation index R’w – can therefore be carried out on the hand-held device without the need for an external control element.
Optionally it can be controlled from a smart phone using NorVirtual app supplied free of charge.
The Nor282 power amplifier – with integrated battery and WLAN – can also be controlled via WLAN. Nor145 sound level meters and the Nor850 software can control the Nor282 directly.
Easy use, easy to configure
You may use predefined setups or creates your own.
The Nor145 sound analyser offers a built-in signal generator for excitation of the source room level measurements or for excitation of the reverberation time measurements. The results are measured in accordance with the ISO 16283 Standard requirements. With additional background level measurement results, an on-board calculation of the final airborne sound insulation indices DnT and Rw in accordance with ISO 717 is performed. Of course, the similar possibility is available for impact sound insulation index Ln,w using a tapping machine such as the Nor277.
The reverberation time excitation may alternatively be based on an impulsive source. In any case, results for T15, T20 and T30 are calculated in parallel. The analysers are seamless integrated with the Nor850 software, either as a remote frontend to the Nor850 Measurement System, or as a manual measurement tool for exporting measurement files to the post processing Nor850 Reporting System. Complete calculation of airborne, facade and impact sound insulation indices in accordance with international and national Standards.
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- Building Acoustics- Upper frame shows Receiving room level with background noise. Running L/t in lower frame to evaluate if unwanted noise appears in the measurement.
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- Building acoustic – rating view 1, calculated sound insulation together with the single number index
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- Building acoustic – rating view 2, numerical table to present the single number index along with the spectrum adaption terms.
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- Building acoustic – rating view 3, all numerical results of the analysis plus a level overview graph
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- Building acoustic – rating view 4, background noise vs. receiving room levels
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- Building acoustic – rating view, The # softkey toggles through specific source position
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- Building acoustic – rating view, R’w rating
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- Building acoustic – RT view.
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- Two sample pictures out of several views offered for RT measurements.
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- Building acoustic – manual adaption of RT time is possible.
Measurement and evaluation in Nor145
With this application, you stay in the room yourself and carry out the spatial and temporal averaging by manually swinging the sound level meter through the room during the measurement. Alternatively, the averaging can be carried out using individual measurements at different microphone positions.
The internal building acoustics mode in the Nor145 guides you through the measurement routine of ISO 16283, forms average values (from several positions) and calculates the single number information according to ISO 717, such as the building sound insulation index R’w or the standard Impact sound level L’n, etc.
The advantages:
- no external control required
- very fast (by manual pivoting)
Features
- Reverberation time measurements with parallel calculation of T15, T20, T30, Tmax and EDT.
- Ensemble averaging of reverberation decays.
- Backward integration of reverberation decays based on impulse excitation.
- User adjustment of individual RT decay lines.
- Signal generator with white, pink or bandpass filtered noise.
- Supports multiple microphone and loudspeaker positions with corresponding on-board energetic or arithmetic averaging.
- Project overview with information about all individual measurement details and project progress.
- Seamless integration with Nor850 reporting software.
- Wireless single or dual channel measurements using one or two Nor145 controlled from Nor850.
- Wireless control of the battery-operated power amplifier Nor282.
- Rw calculation in accordance to national and international standards.
Supported standards
- ISO 16283-1:, ISO 16283-2:, ISO 16283-3, ISO 717-1, ISO 717-2:, ISO 10052
- ASTM E336-23, ASTM E413-22, ASTM E1007-21, ASTM E989-21
- DIN 4109-4
- BS EN ISO 16283-1+A1, BS EN ISO 16283-2, BS EN ISO 16283-3
- SS 25267
- SIA 181
- I.S. EN ISO 16283-1 & A1, I.S. EN ISO 16283-2, I.S. EN ISO 16283-3
Control one/several Nor145 via WLAN
As an alternative to direct measurement in the handheld sound level meter, the Nor145 can also be controlled via WLAN, either via the free NorVirtual app (for smartphones/tablets with Android or IOS) or via the Nor850 software (for tablets/laptops with Windows). In this case, you can stand outside the room and control the measurement from your laptop/tablet/smartphone.
The advantages:
- As an operator, you do not cause any disruptive noise in the room.
- Control of the Nor145 sound level meters over a long range in the building (onboard WiFi in the Nor145).
- Measurement despite fluctuating noise & measurement of high sound insulation.
- Eliminates the measurement errors due to drift in the loudspeaker output/sensitivity.
- Thanks to the SweptSine measurement method, level and reverberation time measurements can be carried out despite fluctuating noise. There is no need to measure the background noise level in the reception room at all. In addition, the SweptSine measuring method enables the measurement of high levels of sound insulation.
Noise sources
Nor282 Power amplifier
Noise sources
Nor283 Dodecahedron loudspeaker
Noise sources
Nor277 Tapping machine
Noise sources
Nor280 Power amplifier
Software
NorVirtual App
Software
Nor850 Reporting software
