Weighing
Functions
Figure 5-3
Step response of digital low pass filter at fg = 2 Hz
5.2.5
DS3 – Limit Frequency
Defining the limit frequency is critically important for suppressing interference. The
“speed” of the scale’s reaction to the change in the measured value is determined
by specifying the limit frequency.
For example, a value of 5 Hz results in a relatively fast scale reaction to a weight
change, while a value of 0.5 Hz makes the scale “sluggish”.
5.2.6
DS3 – Depth of Average Value Filter
The average value filter is used to settle the weight value against interference. The
weight value is based on the average of the n weight values that the SIWAREX MS
calculates every 20 ms or 33
⅓
ms, e.g. if n=10, 10 measurement values are used
to calculate the average value. Every 20 ms or 33
⅓
ms, the oldest value is
dropped and the newest is included in the calculation.
The average value filter also achieves very good attenuation of periodic
interference, if the interference frequency corresponds to an integral multiple of the
relationship.
1/(Filter depth * measurement time).
5.2.7
DS3 – Scale Name
The name consists of a maximum of 10 characters and can be freely selected.
SIWAREX MS 5-25
