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No. 99MBB091A
SJ-301 OVERVIEW
1.1 Outline of the SJ-301
The Surftest SJ-301 is a stylus type surface roughness measuring instrument developed for
shop floor use. The SJ-301 is capable of evaluating surface textures with a variety of param-
eters according to various national standards and international standard. The measurement
results are displayed digitally/graphically on the touch panel, and output to the built-in
printer.
This section explains the surface roughness measurement principle and the features of the SJ-301.
■ SJ-301 surface roughness measurement principle
The stylus of the SJ-301 detector unit traces the minute irregularities of the workpiece
surface. Surface roughness is determined from the vertical stylus displacement produced
during the detector traversing over the surface irregularities. The measurement results are
displayed digitally/graphically on the touch panel.
2. The vertical stylus displacement
produced while tracing the workpiece
surface is converted into electrical signals
AC adapter
5.The measured and/or
statistical data is printed
out.
3.The electrical signals are subject to
various calculation processes.
Workpiece surface
Stylus
Detector traverse direction
1.The detector stylus traces
the workpiece surface
(measured surface).
4.The calculation results
(surface roughness) are
displayed on the touch panel.
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