ASTM D6894 Standard Test Method for Evaluation of Aeration Resistance of Engine Oils in Direct-Injected Turbocharged Automotive Diesel Engine
12. Report
12.1 Reference oil tests require the use of the standardized report form set and data dictionary for reporting test results and for summarizing the operational data.
NOTE 13 - The actual report forms and data dictionary can be downloaded separately from the ASTM TMC Web Pages at http://dgaequipment.com/ or can be obtained in hardcopy format from the TMC.
12.2 Report the mean and individual values for the samples collected at 1 h, 5 h, and 20 h.
12.3 Report Format:
12.3.1 Report all results in SI units. Where measurements are made in units other than SI, follow the conversion rules described in IEEE/ASTM SI-10.
12.3.2 Precision of Reported Units - Use Practice E 29 for rounding-off data. Use the rounding-off method to report data to the required precision.
13. Precision and Bias
13.1 Precision:
13.1.1 Test precision is established on the basis of operationally valid reference oil test results monitored by the TMC. Research Report RR:D02-1379 contains industry data developed prior to establishment of this test method.
13.1.2 Intermediate Precision (formerly called repeatability) Conditions - Conditions where test results are obtained with the same test method using the same test oil, with changing conditions such as operators, measuring equipment, test stands, test engines, and time.
13.1.2.1 Intermediate Precision Limit (i.p.) - The difference between two results obtained under intermediate precision conditions that in the long run, in the normal and correct conduct of the test method, exceed the value shown in Table 5 in only one case in twenty.
13.1.3 Reproducibility Conditions - Conditions where test results are obtained with the same test method using the same test oil in different laboratories with different operators using different equipment.
13.1.3.1 Reproducibility Limit (R) - The difference between two results obtained under reproducibility conditions that would, in the long run, in the normal and correct conduct of the test method, exceed the values in Table 5 in only one case in twenty.
13.1.4 The TMC will update the precision data as it becomes available.
13.2 Bias - Bias is determined by applying an accepted statistical technique to reference oil test results and, when a significant bias is determined, a severity adjustment is permitted for non-reference oil test results (refer to the TMC for details).
14. Keywords
14.1 aeration; automotive; diesel engine; EOAT; foaming; heavy-duty; HEUI; medium-duty
