FAQ 0191 - Why can't every filter be set for small measuring ranges?

Why can't every filter be set for small measuring ranges?

An STGMM measuring module can measure very small signals if the noise component of the input signal is reduced by using a filter (Butterworth, cut-off frequency max. 100 Hz). CSMconfig can detect such cases and then adjusts the list of possible filter frequencies. However, higher filter frequencies are only available when larger measuring ranges are used.

The lower limit value for the start of a reduced measuring range depends on certain parameters. The following table summarizes a few examples.

Sensor excitation	STG settings	Reduced Range	Regular Range
1,0 V	-	3,0 .. 20 mV/V	20 .. 200 mV/V
2,5 V	-	1,2 .. 8 mV/V	8 .. 80 mV/V
5,0 V	-	0,6 .. 4 mV/V	4 .. 40 mV/V
2,5 V	B=1,3, k=2,05	1801 .. 12007 µm/m	12007 .. 120075 µm/m
5,0 V	B=4, k=2,05	229 .. 1951 µm/m	1951 .. 19512 µm/m
5,0 V	B=2, k=4,0	300 .. 2000 µm/m	2000 .. 20000 µm/m