VC-6000
TM
Compact monitor Part C Highpass / Lowpass filter
- 18 - C100583.002 Components Vers. 07 © VC-6000
TM
Compact monitor Sept. 2011
4 Highpass / Lowpass filter
4.1 Function
♦ Filters are used to objectively change the energy content of signals.
Signal filtering can thus have various objectives as follows:
♦ E.g. on the following basis:
1. Lowpass filter:
To filter out high-frequency energy such as high-frequency noise
components.
2. Highpass filter:
To filter out low-frequency energy and static signal components.
3. Bandpass filter:
A combination of a lowpass and a highpass filter to concentrate on
a specific frequency range.
4. Bandpass filter for machine assessment according to DIN ISO:
Fixed bandpass from 10 Hz - 1 kHz with machine speeds
> 600 rpm or 2 Hz - 1 kHz with machine speeds < 600 rpm.
5. Bandpass filter for assessment of rolling-element bearing condition:
Fixed bandpass from 1 kHz - 10 kHz.
6. Integration filter:
Conversion of the signal to another vibration parameter, e.g. from
acceleration to velocity.
7. Frequency response linearisation:
To extend the frequency range of a vibration velocity sensor.
♦ The VIBROCONTROL 6000 Compact monitor uses various
comfigurations for signal filtering. Fundamentally digital filters are used
(e.g. 3
rd
order Butterworth filter).
♦ The integration of acceleration signals in the
VIBROCONTROL 6000 Compact monitor can also be effected by
analogue techniques because with signal integration, analogue filters
have the best technical measurement properties.
4.2 Parameter list with setting ranges
Note:
In the user menu of the User Terminal all filters are exclusively
designated only as highpass filter or lowpass filter. The actual
construction step of each signal path can be taken respectively from
the individual instrument documentation (signal-flow chart).
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