Final Report on Torque with Cross Force Comparison No. MT01 ...

<strong>Final</strong> <strong>Report</strong> of MT017. Analyzing method of comparison resultsThe results of comparison were determined according to ISO/IEC GUIDE 43-1 :1997 and ISO/IEC GUIDE 43-2 : 1997 “PROFICIENCY TESTING BYINTERLABORATORY COMPARISONS” [1], [2]. The objective is to measure thedeviation from reference value and determine its acceptability with performance criteriaby using equation as following:1) Percent difference, d( x − X )irefd = ×100(1)XrefWhere:x is the measured value of participating laboratories i (i =1,2,…,n)iXrefis the reference value that provided by National Institute ofMetrology (Thailand)2) Ennumbers,xi− XrefdEn= =(2)2 22 2U ( xi) + U ( X ref ) W( xi) + W( X ref )Where:U is the expanded uncertainty of a participant’s result.The( x i)U is the expanded uncertainty of NIMT’s result.( x ref)W( x i )is the expanded relative uncertainty of a participant’s result in termof %.W is the expanded relative uncertainty of NIMT’s result in term of %.( x ref)Ennumber is determined with performance criteria that is express as- The comparison results are satisfactory if En≤ 1.- The comparison results are unsatisfactory if En> 1.- The measurement system should be investigated when 0.5≤ E ≤ 1.8. Comparison resultsFrom the measurement data, the deviation and E n numbers of each participantwere computed as shown in table 5 and table 6 respectively. Figure 9 to figure 28 showthe deviation at -40 N·m, 40 N·m, -60 N·m, 60 N·m, -80 N·m, 80 N·m, -100 N·m, 100N·m, -150 N·m, 150 N·m, -200 N·m, 200 N·m, -250 N·m, 250 N·m, -300 N·m, 300 N·m,-350 N·m, 350 N·m, -400 N·m and 400 N·m respectively. Figure 29 to figure 38 show E nnumbers at ±40 N·m, ±60 N·m, ±80 N·m, ±100 N·m, ±150 N·m, ±200 N·m, ±250 N·m,±300 N·m, ±350 N·m and ±400 N·m respectively.n14