Frequency Measurements With The Vibra-Series - Profound VIBRA Series Manual

Notification Wakeup enabled/disabled
If the VIBRA has been programmed with an on/off time and afterwards has been switched off by the user,
the system will not switch on automatically at the on-time. Before the system is switched off, the
notification Wakeup at 00:00? appears on the display, whereby the user has the option to activate the
on/off time.
Select OK to activate the on/off time. On the screen the notice Switching Off, Wakeup Enabled is
displayed.
Select Off to deactivate the on/off time. On the screen the notice Switching Off, Wakeup Disabled is
displayed.
Please note: if this notice is ignored or not noticed by the user, the system will switch on automatically
It is always possible to activate the time programming by switching on and off the VIBRA and then
assent the notification. Please find more information in the paragraphs 5.3.9 and 5.3.10 of this
manual.

Frequency measurements with the VIBRA-series

4.3
The VIBRA determines the vibration frequency in accordance with the applicable vibration code, using
either the ´Zero Crossing´ or 'FFT' (Fast Fourier Transform) method, as described in DIN 4150; or
according to Method I or II, as described in the Dutch code SBR. The method used depends on the
model:
•
the VIBRA always determines the frequency with the 'Zero Crossing'-method.
•
the VIBRA-sbr uses either Method I or II, since both methods are accepted under the Dutch SBR
guidelines. However, Method I is the preferred method.
• +
the VIBRA
uses either the 'Zero Crossing', the 'FFT' (Fast Fourier Transform) method, or
Methods I or II.
More information about the frequency methods can be found in the applicable standards.
When measuring you can select in the measuring submenu of the VIBRA-sbr or VIBRA
for display. The preferred method is FFT and Method I respectively. Please note that the selected
frequency type will only be used for the frequency measurement as displayed on the screen. Both
frequencies FFT and Zero Crossing or Method I and II are available in the PC file. Please find more
information in paragraph 5.2.2.
Correctly applying FFT or Method I (VIBRA
In order to apply the FFT correctly, the proper building category (Cat. 1, Cat. 2 of Cat. 3) should be
selected before starting the measurement. Please select the category in the option Peak Type of the
Change Settings menu. Further explanation is given in paragraph 5.3.3.
at the ON-time.
+
only)
Manual Profound VIBRA-series, version 2.00
+
the desired method
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