MMF VM30-H, Инструкция по эксплуатации, Страница: 13 / 58

5.2. Hand-Arm Vibration Measurement with the VM30-H
This section will give you basic instructions for the measurement and evaluation of hand-arm
vibrations based on the standard ISO 5349 and the guideline VDI 2057, Part 2. Please consult
the original documents for detailed explanations.
5.2.1. Measuring Points for Hand-Arm Vibration
The sensors should be attached as close as possible to the place of entry into the hand, however,
they must not interfere with the work process. Measurement shall be performed with the same
hand pressure force as used under normal operating conditions.
Since most machine tool handles do not provide surfaces for the adhesive or screw attachment
of sensors, Metra offers some mounting accessories for curved surfaces.
Figure 5: Mounting accessories for hand-arm vibrations models 140 and 142
The adapter model 140 is attached with a plastic cable strap. Model 142 is pressed onto the
handle by the hand.
Very important is a tight contact between sensor and machine. Any motion of the sensor would
distort the measurement.
Figure 6 shows the axis directions for the attachment of the sensor at the handle. For cylindric
handles the Y direction point in the direction of the handle axis. The Z axis is approximately the
extension of the third metacarpal bone.
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