Brüel & Kjær Sound & Vibration Measurement A/S

2250 Hand-held Analyzer now Reverberates


Courtesy of Courtesy of Brüel & Kjær Sound & Vibration Measurement A/S

The development mantra for the 2250 Hand-held Analyzer 'easy, safe and clever' has now been applied to reverberation time. A new software package extends Type 2250's powerful functionality with reverberation time analysis.

Easy, Safe and Clever
Reverberation Time Software BZ-7227 applies Type 2250s 'easy, safe and clever' concept to reverberation time. Press the Start key, clap your hands that's all it takes to do a basic measurement. Type 2250s traffic light indicates the measurement status for efficient, delay-free measurements. And with useful, practical features such as Escape Time, Build-up Time, and automatic repetitions to ensure an efficient measurement process, as known from the 2260 Investigator solution, Type 2250 ensures an efficient measurement process. Measurement quality indicators are provided to help ensure valid measurement and documentation, and to troubleshoot decays.

An innovative, powerful approach to room and position bookkeeping, utilising the capabilities of the 2250s high resolution colour display, eases measurement, calculation and reporting, as do the voice commentaries and notes that can be attached to positions to help document the measurements. Reviewing results is simple as you can scroll through rooms and between positions, and unwanted position results can be deleted or excluded.

Meeting the Standards and Your Expectations
Naturally, measurements comply with the relevant parts of ISO standards including ISO 140, ISO 3382, and ISO 354. Reverberation time can be measured using either Impulsive Excitation (Schroeder Method), such as from a pistol or balloon burst, or using Interrupted Noise with either the units own internal signal generator or an external one. For impulsive noise excitation, the single 120 dB input range saves you trial measurements, and it speeds up interrupted noise measurements by avoiding autorange. The measurement can be in octaves or 1/3-octaves in parallel (multispectra) over a user-selectable frequency range allowing you to focus sound power on the relevant range. The built-in pink or white generator includes automatic control where switching off the signal starts the measurement. In each frequency band, the decay is sampled 200 times each second, for reverberation times as long as 20 seconds.

The T20, T30 and EDT spectra are shown for each measurement and as an average for all measurements in a room. And the decay curves for each centre frequency can be viewed with the slope line and evaluation range. Type 2250 can also display the ensemble average decay and corresponding RT for the room under investigation.

For the measurements, a wide range of useful accessories including power amplifier, sound sources, and wireless transmission kit are available. And of course, PC software is available for post-processing and reporting

To see how 'easy, safe and clever' reverberation time measurements can be, contact your local Brüel & Kjær representative.

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