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5. Preparation of Measuring Points
5.1. General Information on Measurement Point Choice
When monitoring machines it is important to take measurements under the same operating conditions, at the same measurement point. Choosing the suitable
measurement point is therefore decisive. Where possible, qualified staff experienced in machine monitoring should be called upon.
It is generally advisable to record machine vibrations near to their source. This helps to reduce distortion of the measuring signal to a minimum when it is being carried
through transmission parts. Suitable measurement points include rigid machine components such as bearing housings or gearboxes.
Light or mechanically flexible machine components such as cladding and casing are unsuitable for the measurement of vibrations.
5.2. ISO 10816-1 Recommendations
The standard ISO 10816-1 recommends bearing housings or their immediate surroundings as preferred measuring location points for the measurement of machine vibrations
(Figures 13, 14, 15 and 16). For the purpose of monitoring a machine it is normally sufficient to take measurements in only one direction, either vertically or horizontally.
On machines with horizontal shafts and rigid foundations the largest vibration amplitudes occur horizontally. With flexible foundations, strong vertical components also
arise.
For the purpose of acceptance tests, measurement values are to be taken from all bearing point locations at the center of the bearing and in all three directions (vertical,
horizontal and axial).
The following illustrations give a few examples of suitable measurement point locations.
The Standard ISO 13373-1 also gives recommendations for measurement points on various machine type.
Y
Y
X
X
Z
Z
Figure 13: Measuring points on verticalbearings
Figure 14: Measuring points on flange bearings
Z
X4
Y4
Figure 15: Measuring points on electric motors
Figure 16: Measuring points on machines with vertical
rotors
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