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a measurement point number has not been identified.
Note: The decimal point may appear in one of two positions, dependent on the measurand. This is due to the automatic gain switch-over. In this way smaller
measurands with high resolutions are sure to be detected
6.2. Selecting the Display Quantity
With keys ◄► you can select from among the six available operation modes:
• Vibration velocity 10 Hz – 1 kHz
• Vibration velocity 2 Hz – 1kHz
• Vibration acceleration 0.2 Hz – 10 kHz
• Vibration acceleration 3 Hz – 1 kHz
• Vibration acceleration 1 kHz – 10 kHz
• Vibration displacement 5 Hz – 200 Hz
• K(t) value for rolling bearing monitoring
• Rotational speed and temperature
By pressing F2 you can switch between RMS and peak value for the acceleration velocity and displacement. The RMS is the so-called “true” root mean
square value.
The peak value, also known as crest or maximum value, is the highest vibration value since the last displayed value. The crest factor, is the relation between
crest value and RMS. It is used to describe the curve form. For a sinusoidal signal it amounts to √2 = 1,41. The more impulsive the signal, the higher the crest
factor.
Note: When saving measurement values (chapter 6.4) the RMS and peak value are always saved both irrespective of the currently selected setting.
If the sensor locates a VMID measuring point which is already saved in the PCE-VM 25 memory, in order to prevent unintentional switch-over, a warning signal
will be displayed when the measurand changes (Figure 19). By pressing OK the measuring range can still be changed. The warning signal will not appear again
until the next
measuring point is detected.
Figure 19: Warning at mode change
6.3. Measurement Point Detection
6.3.1. Reading the VMID Data with the PCE-VM 25
The VMID measurement points are designed, so that the magnetic sensor base centers itself. To avoid mechanical shock do not let the sensor snap onto the
measurement point, instead, roll it slowly over the edge. To improve the vibration transmission the measuring point can be lightly lubricated.
As soon as the Sensor base comes into contact with the measurement point, the PCE-VM 25 displays the measurement point number (Point ID) (Figure 20).
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