Mitutoyo SJ-301 - Filters

14 - 9 No. 99MBB091A
14. REFERENCE INFORMATION
14.2.2 Filters
■ Filter types
The following 3 types of filters are available on the SJ-301.
retliFscitsiretcarahcedutilpmAscitsiretcarahcesahP
noissimsnartedutilpmA
htgnelevawffotucehtta
CR2CR2noitcer
rocesahptuohtiW%57
57CPCR2retliftcerrocesahP%57
SSUAGnaissuaGretliftcerrocesahP%05
Each of the filter characteristics will be explained below.
The transmission characteristic of each filter will be represented by that of a high-pass filter.
● 2RC
This has the same transmission characteristic as that of two R-C circuits having identical
time constants connected in series.
The transmission characteristic is -12dB/oct and the amplitude transmittance at the cutoff
length is 75%, as shown in figure below.
0.1
2
3
10
7
5
20
30
100
70
80
50
0.2 0.3 0.7 10.5 2 3 7 10
-30
5
-25
-15
-10
-5
0
-20
λ/λc
Transmission characteristic of 2RC filter
Amplitude transmission (%)
Amplitude transmission (dB)
H (λ) = Transmission characteristic:
1
λ
3λc
1 +
2