No. 99MBB122A
6-2
6.1 Calibration Preparation
To perform calibration, measure the precision roughness specimen and adjust gain so that
measured value is equal to Ra of the precision roughness specimen. Measured surface of
the precision roughness specimen has a series of sine wave shapes, and Ra (nominal
value) is displayed.
Depending on the usage of the SJ-210, calibration should be performed periodically. In
addition, when the instrument is used for the first time or when the detector has been
attached or detached, calibration is necessary.
Without properly calibrating the instrument, correct measurements can not be obtained.
6.1.1 Calibration preparation (standard type, retracting type)
Use the supplied precision roughness specimen for calibration.
NOTE
• When 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 calibration conditions, refer to 6.4,
“Setting the Nominal Value of the Precision Roughness Specimen” and 6.5, “Setting
Calibration Conditions”.
ع Setting up the precision roughness specimen, calibration stage, and SJ-210
1 Place the precision roughness specimen and calibration stage on a level table.
Precision roughness specimen and calibration stage
Precision roughness specimen
Calibration stage
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