No. 99MBB122A
15-1
15 MAINTENANCE AND
INSPECTION OF SJ-210
15.1 Daily Care
■ Checking for normal operation
To judge whether the SJ-210 is in normal operation, after calibrating it with the supplied
roughness specimen (Order No.178-601, 178-605), check that the dispersion of Ra values
is within ±0.05 m, which is obtained from repeated measurements of the same point.
However, when the measured point on the supplied roughness specimen (Order
No.178-601, 178-605) is changed during repeated measurement, the dispersion of ±0.09
m (±3% of the nominal value) included in the roughness specimen is added to that of the
Ra values. Care should be exercised.
NOTE
• This dispersion in the roughness specimen is a value obtained under the conditions that
there are no dent and abrasion on the detector stylus tip and no scratch and abrasion on
the specimen surface.
■ Detaching the drive/detector unit
After a measurement task has been completed, store all the SJ-210 components and its
accessories in cases to keep out dust and moisture.
NOTE
• Keep the built-in battery switch on unless the SJ-210 will not be used for a long period of
time (more than 2 to 3 weeks). With the built-in battery switch on, measurement results
obtained immediately before the SJ-210 is turned off by the auto-sleep function are
saved and displayed on the LCD the next time the instrument is used.
However, when the built-in battery switch is off, the measurement results will be lost.
TIP
• For information on how to detach the drive/detector unit and the separation of the two,
refer to 3.2, “Attaching and Detaching the Drive/Detector Unit”.
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