JB/T 5681-2000 This standard is a revision of JB/T 5681-1991 "Test Methods for Small Roller Mills". The revised standard clarifies the reliability assessment calculation method; clarifies some test conditions and requirements; simplifies and improves some test record forms. This standard specifies the test conditions, test items and test methods for performance testing and production testing of small roller mills. This standard applies to small roller mills, that is, small roller grinding and screening combination machines (including stand-alone automatic feeding mills). This standard was first published in 1984 as N 342-84 and revised for the first time as JB/T 5681-91 in September 1991. This is the second revision.