a test whose results are considered to be untrue because of intentified causes other than properties of the material being tested, e.g errors in specimen machining or testing (see: replaced test), katse, mille tulemused tuleb lugeda ebaõigeteks määratud juhtudel (vead katsekeha valmistamisel, katsetamisel), v.a katsetatava materjali omadused (vt asenduskatse)