K&M KR200, Instruction Manual

Page: 18 / 143

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constant rate. The pickup acquires the surface roughness by the
sharp stylus in pickup. The roughness causes displacement of pickup
which results in change of inductive value of induction coils thus
generate analogue signal which is in proportion to surface roughness
at output end of phase-sensitive rectifier. This signal enters data
collection system after amplification and level conversion. After that,
those collected data are processed with digital filtering and parameter
calculation by ARM processor and the measuring result can be read
on LCD, printed through printer and communicated with PC.