Kuulijäljemõõturi kera pööratakse lühikese aja jooksul (vähem kui 20 sekundit 0,1 mikromeetrise kuni 5 mikromeetrise paksuse puhul), kuid teemantpasta abrasiivse iseloomu tõttu on see piisav aeg jälje/kraatri tekitamiseks õhukestesse pinnetesse.
Calo tester consists of a holder for the surface to be tested and a steels phere of known diameter that is rotated against the surface by a rotating shaft connected to a motor whilst diamond paste is applied to the contact area.
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The sphere of Calo tester consists of a holder for the surface to be tested and a steels phere of known diameter that is rotated against the surface by a rotating shaft connected to a motor whilst diamond paste is applied to the contact area. is rotated for a short period of time (less than 20 seconds for a 0,1 micrometre to 5 micrometre thickness) but due to the abrasive nature of the diamond paste this is sufficient time to wear a crater through thin coatings.
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