Mitutoyo SURFTEST SJ-410 - Page 561

23. REFERENCE INFORMATION
No. 99MBB765A
23-11
• About the phase compensation filter
For the regular 2CR filter, output waveforms may be distorted due to phase deviations
that vary with each wavelength.
Shown below are the responses of both a low-pass filter and a high-pass filter to
square wave input.
Input wave form
Low-pass filter
High-pass filter
Input signal (square wave)
0.20 µm/cm (×50000)
500.00 µm/cm(×20)
LPF: PC
0.20 µm/cm (×50000)
500.00 µm/cm
（
×20)
LPF: 2CR
0.20 µm/cm (×50000)
500.00 µm/cm (×20)
HPF: PC
0.50 µm/cm (×20000)
500.00 µm/cm (×20)
HPF: 2CR
0.20 µm/cm (×50000)
500.00 µm/cm (×20)