Measurement Equipment and Testing Procedures
We have a comprehensive range of audio and acoustic test and
measurement equipment and we are continually updating as new equipment reaches
the market. The measurement equipment currently in use is able to interface
with our office computers so that data transfer from the field does not suffer
any transcription error. All graphs, plots, and other survey and test data can
be directly printed into reports via data transfer programs.
Current Test and Measurement Equipment Includes:
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IVIE PC40 Computer Controlled Spectrum Analysis System with 1/3 octave band
filters from 20 Hz to 20 kHz at thirty ISO bands with Precision Sound Level
Meter exceeding ANSI S1.4-1983 Class 1 specifications. This system has digital
storage for up to 200,000 events and includes Reverberation Time (RT60)
measurement, delay and flutter echo measurement by energy-time analysis and
many other software controlled acoustic and audio measurements on board. Some
of this software has been specifically designed and written by SSA staff.
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Ivie IE-2P, 200 volt precision microphone preamplifier for powered microphones
so that long distance outboard testing data does not suffer from long cable run
losses.
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Bruel and Kjaer 4165 1/2 inch free field microphone and ACO Pacific 1134 1/2
inch random response microphone for both free field and random response
measurements.
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Quest Model CA-22 dual frequency, dual amplitude, microphone calibrator
exceeding ANSI S1.40-1984 Class 1 microphone calibration (0.3 dB) This is used
to check the calibration of our microphones before and after critical surveys
and tests where accuracy to within +/- 0.3 dB is required at all octave band
frequencies of interest.
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IVIE IE-20B, Pink and White Noise Generator with calibrated stepped output
levels of +/-0.5dB from 20Hz to 20kHz. Noise is digitally generated by CMOS
circuitry with a stable crest factor of 3.75.
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Quest Model 1700 Precision Sound Level Meter Type 1 with Model OB-100 ten
octave band filters from 31.5Hz to 16kHz.
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TIC Active Audio Cable Checking system for cable earth, shielding, polarity,
ground loop, resistance, etc.
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Various other electronic test devices including sine wave generators,
multi-testers, and electrical test and measurement equipment.
Testing Procedures
We are able to arrange for a wide variety of standard audio and acoustic tests
but we can also provide custom-designed test procedures to suit a client's particular
requirements.
Typical acoustics, noise, and audio tests include:
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Reverberation Time (RT60) for studios, auditoriums, theaters, churches, etc.
RT60 can be measured for ISO 20, ISO 30, and EARLY DECAY, in octave and 1/3
octave band frequencies.
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Measurement of "flutter echo" and other non linear decay in the reverberent
envelope. Also measurement of initial time delay for first reflected signal.
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Measurement of Noise Criteria (NC), Preferred Noise Criteria (PNC), Noise
Rating (NR), noise level in dB(A,C, or flat), and Noise Exposure from any noise
source, or the ambient noise level for a particular environment.
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Measurement of Noise Reduction Index, Field Sound Transmission Loss, Field
Sound Transmission Classification, etc. of walls, floors, ceilings, doors, etc.
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Real Time Analysis (RTA) in 1/3 octave bands and room equalization for control
room monitors, public address systems and sound reinforcement systems using
swept sine waves and pink noise sources.
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LEDR (TM) Control Room Monitor Test courtesy of E.A.S.I.
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Swept Sine and 1/3 octave Real Time Analysis (RTA) including output levels of
audio system components including crossovers, processors, speakers, amps,
mixers, etc.
Note: Wherever possible our acoustic tests conform to the applicable standard
procedures defined by ANSI S1 for Acoustics, ANSI S2 for Shock and Vibration,
and ANSI S12 for Noise.
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