Applications

Occupational Noise

The occupational noise measurement is based on assessment of daily noise exposure level (LEX, 8h) defined by ISO 1999. The LEX,8h is basically a 8-hours extrapolation of LAeq measured over the working hours. The Directive set up limits for LEX, 8h: 87 dBA as the daily limit, 85 dBA as the upper action value and 80 dBA as the lower action.

Hand-arm Vibration

Hand-arm vibration is usually complex and may be the result of the construction of the device, structural defects or its usage. During human contact with the surface of the vibrating machine, mechanical vibrations are transmitted directly to the human body, affecting the individual tissues or even the whole body.

Whole-body vibration

ISO 2631-1 defines methods of whole-body vibration measurements in the frequency range from 0.5 Hz to 80 Hz for health, comfort and perception and from 0.1 Hz to 0.5 Hz for motion sickness. The vibration evaluation according to this part of ISO 2631 is based on measurements of the weighted root-mean-square (RMS) vibration acceleration.

Environmental Noise

The ISO 1996 standards series describe assessment of environmental noise. The methods and procedures are intended to be applicable to noise from various sources, individually or in combination, which contribute to the total exposure at a site.

Building vibration

Generally, there are two methods of building vibration measurements: one that uses PPV method with the FFT for dominant frequency analysis and second that analyses vibrations in 1/3 octave bands. Both methods use different criteria for building damage and they might interpret the same vibration event differently.

Sound measurements

Sound is a sensation perceived by the human ear resulting from rapid fluctuations in air pressure. These fluctuations are usually created by some vibrating object which sets up longitudinal wave motion in the air. Sound measurements provide definite quantities which describe and rate sounds.

Building Acoustics

Building acoustics as described in ISO 16283 takes into consideration airborne and impact and facade sound insulation in buildings.

Speech Transmission Index for Public Address Systems

STIPA

Speech Transmission Index is a measure of speech transmission quality. STIPA is a version of the STI using a simplified method and test signal.

Machine vibration

Machine Vibration Measurements typically based on analysis of the vibration frequency, displacement, velocity, and acceleration.