Salutron SRT5000, Инструкция по эксплуатации

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2 Working principles
When the sensor is making a linear uniform motion along
the test surface, the contact stylus in perpendicular with the
work surface is moving up and down on the work surface. Its
motion is converted into electric signals, which are
amplified, filtered and transformed into digital signals
through A/D. The signals are then processed by the DSP
into Ra and Rz (or Rq and Rt) values before displayed on
the screen.