ISO 8862-1
General

ISO 15744
Hand-held non-electric power tools-Noise
measurement code Engineering method

ISO 28927-1
Angle and vertical grinder

ISO 28927-2
Wrenches, nut-runners and screwdrivers

ISO 28927-3
Polishers and rotary, orbital and random orbital sanders

ISO 28927-9
Scaling hammers and needle scalers

ISO 28927-12
Die grinder

A glance at the laboratory instruments:
The meters and other items of measuring equipment should meet the correct specification for the measurement of handtransmitted vibration and noise emission given in related ISO standard.

KENTE adopt the Brüel & Kjær instruments for measuring both sound and vibration.

The vibration magnitude (level) is represented by the frequency-weighted rms acceleration in m/s2 of the surface of the tool, handle or workpiece in contact with the hand.

The risk to health from vibration is affected by the frequency content of the vibration. When vibration is measured in accordance with ISO 5349-1:2001, vibration frequencies between 8 and 16 Hz are given most weight, and frequencies above and below this range make a smaller contribution to the measured vibration magnitude. This process is called frequency weighting. Vibration meters intended for HAV measurement are equipped with a frequency weighting filter, to modify their sensitivity at different frequencies of vibration.

The measurement and evaluation of human exposure to hand transmitted vibration comply with the ISO 5349. The vibration transmitted to the hand shall be simultaneously measured and reported for three directions (X, Y, or Z) of an orthogonal coordinate system as shown in the figure below. For a family of machinery, these directions of vibration measurement shall be defined in the vibration test code. Three series of five consecutive tests shall be carried out on each machine tested, using a different operator for each series.

During a vibration measurement, the rms value of the frequency-weighted acceleration is determined. It is important that the measurement duration is long enough to allow a representative average value to be obtained.

Measurements should be made to produce vibration values that represent the average vibration for that tool or process throughout the operator's working period during the day. It is therefore important that the operating conditions and measurement periods etc. are selected to achieve this.

Each test run shall be such that the measurements can be carried out with an integration time in accordance with related ISO standards, when stable operation has been established.