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No. 99MBB091A
4. MEASUREMENT OPERATION
4.2 Calibration
Calibration of a surface roughness measuring instrument is performed by measuring (called
“calibration measurement”) a reference workpiece (precision roughness specimen) and adjust
the difference (gain adjustment), if any between the measured value and reference value
(precision roughness specimen).With the SJ-301, adjustment of the difference between the
measured value and reference value (gain adjustment) can be easily achieved by calibration
measurement.
Calibration should be performed periodically according to how frequently and in which
conditions the SJ-301 is used. If the instrument is used for the first time or if the Detector is
mounted/replaced, calibration is essential.
Without properly calibrating the instrument, correct measurement data can not be obtained.
4.2.1 Calibration preparation
Use the supplied precision roughness specimen for calibration.
NOTE If calibration needs to be performed with a standard other than the supplied precision
roughness specimen, it must only be done after the default calibration conditions
have been modified so they are suitable for the roughness specimen. For information
about the procedure used to modify the calibrating conditions refer to “5.15 Modifying
the Calibration Conditions”.
■ Setting up the precision roughness specimen and SJ-301
1. Place the precision roughness specimen on a level table.
Level table
Precision roughness specimen
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