Mitutoyo SJ-210 - Page 368

18. Reference Information
No.99MBB122A
18-11
 GAUSS (Gaussian)
The amplitude characteristic is approximately -11.6 dB/oct, and the amplitude
transmission at the cut-off value is 50%. The attenuation characteristic is shown in the
figure below.
Attenuation characteristic of the GAUSS (Gaussian) filter
Attenuation characteristic:

2
1












ca
eH
where
0.4697
2ln
2
1
ѳ








a
Using this filter results in a simple equation:
unfiltered profile = roughness profile + waviness profile
Therefore, the low-pass filter is characterized by:
Attenuation characteristic:

2












ca
eH
Am
p
litude transmission
(
%
)
Am
p
litude transmission
(
dB
)