Frequency Low Pass Filter 1; Order No. Low Pass Filter 1; Depth Average Filter; Image 8-2 Step Response Of Digital Low Pass Filter At F = 2 Hz - Siemens SIWAREX WP251 Manual

Scale parameters and functions
8.3 DR 3 Calibration parameters
8.3.28

Frequency low pass filter 1

There is a critically damped low-pass filter for suppression of disturbances. The diagram
below shows the step response of the filter (f = 2 Hz). The entry "0" means that the filter is
switched off. A limit frequency of between 0.01 and 20.0 Hz can be specified.

Image 8-2

The definition of the limit frequency is extremely important for the suppression of
disturbances. Defining the limit frequency defines the "speed" of the scale's response to
changes in the measured value.
A value of 5 Hz, for example, results in a relatively rapid response to a change in weight; a
value of 0.5 Hz makes the scale "slower".
8.3.29

Order no. low pass filter 1

The number of the filter defines the effect of damping. The values 2, 4, 6, 8, and 10 can be
set. The higher the selected filter number, the higher the effect.
8.3.30

Depth average filter

Depth average filter 1 is used to settle the weight value from periodic disturbances. The
weight value is calculated from the average of the n (n = max. 250) most recent weight
values calculated by the weighing module every 10 ms. When n = 10, for example, 10 values
are used to calculate the average. Every 10 ms, the oldest value is omitted from the
calculation and the newest value is included in the calculation (running average).
74
Step response of digital low pass filter at f = 2 Hz
SIWAREX WP251
Manual, 12/2015, A5E37203357A