Units/Filter - HBM TIM-EC Montageanleitung

10.3.3 Units/Filter

Fig. 10.9 Units/Filter
The Units/filters menu can be used to select the unit of measurement, decimal places
and sign for the measured quantities. You can also activate various low-pass filters
(0.1 Hz ... 3 KHz or OFF).
CASMA (Crank Angle Synchronous Moving Average) filter
The CASMA filter is a moving average filter with low-pass filter characteristics. The filter
does not work on a time base, in the usual way, instead it uses angular synchronism,
which allows an automatic response to changes in the rotational speed. This enables the
filter to eliminate the recurrent interference occurring synchronously to the shaft rotation
and the signal is "smoothed".
For the filter to function in the TIM-EC, an angle of rotation pulse is required, as well as
details from the user. The TIM-EC is fitted with an input for measuring rotational speed.
When a rotational speed measuring system is connected, angle of rotation pulses (Ф) are
available to trigger the filter. Parameters transmitted over the web interface are used for
filter parameterization. For filter operation, the size of the window, i.e. the number of
measured values to be used for averaging, must be calculated.
TIM-EC
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SETTINGS