PCE Instruments PCE-VT 3900 Bedienungsanleitung Seite 45

5.1.2 Parameter
It is possible to switch between the parameters RMS, peak, peak-peak and crest factor. This sub
menu can also be directly accessed from the main screen by pressing the arrow key RIGHT
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RMS: Root Mean Square, effective value of the signal
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Peak: highest absolute value of the signal
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Peak-peak: difference between highest and lowest value of the signal
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Crest factor: Quotient of peak and RMS, roughly describes the signal form
5.1.3 ISO evaluation
In order to enable the automatic evaluation of the current measurement value according to the
ISO standard 10816-3, the measuring unit vibration acceleration or vibration velocity in
conjunction with the parameter RMS must be selected. This is necessary as the ISO standard
only lists valid thresholds for these combinations. After selecting the correct options, the
appropriate group for the machine can be selected in this menu. The reading will be evaluated
according to this group.
When this function is enabled, the name of the activated group is displayed at the bottom of the
measuring screen together with a graph of the four vibration severity zones. The current
measurement value is categorized into one of the four zones and colour coded according to the
thresholds. Additionally, the item which represents the current zone flashes so that the reading
can be quickly evaluated with regards to the limit values defined in the standard.
If the ISO evaluation is currently enabled and an incompatible measuring unit (acceleration) or
parameter (peak, peak-peak, crest factor) is selected, the evaluation function is automatically
disabled and a hint is displayed on the screen.
Fig. 5 Parameter
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