Operating manual EMGZ307
13
7.5
Configuring the Lowpass Filters
The measuring amplifier provides two lowpass filters. They are used to eliminate
faulty signal variations which may be caused by unbalanced rollers, vibrations of the
machine, or equivalent.
•
The lowpass filter U is effective to the tension output.
•
The lowpass filter I is effective to the current output.
The lower the cut-off frequency, the more sluggish the output signal will be. The
configuration is made by soldering of a non-polarized capacitor to the soldering points
(refer to fig. 5). The capacitor will be determined referring to the following formula or
list:
Cut-off frequency
[Hz]
Capacitor [
µ
F]
1
10
C = 10 / F
2
5
5
2
10
1
C: Capacity [
µ
F]
20 0.5
F: Cut-off frequency [Hz]
50
0.2
100
0.1
200
0.05
500
0.02
1000
0.01
Note
Don’t use electrolytic capacitors because they can’t handle the bipolar signals appied
in this application. They would damage the electrolytic capacitor.
