National Type Evaluation Technical Committee stevenc

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Specifications	National Type Evaluation Technical Committee stevenc
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NTEP 2010 Final Report Appendix C – NTETC Weighing Sector NTEP - C14 Background: WMD recently received an inquiry from

Specifications	National Type Evaluation Technical Committee stevenc
Outline	Table of Contents - Annual Report of the 95th NCMW NTEP 2010 Final Report NTEP 2010 Final Report Appendix C – NTETC Weighing Sector Meeting Summary Load Cell Items 1. Load Cell Creep Recovery 1 (a). Load Cell Creep Recovery (Recommended Changes to Publication 14 Based on Actions at the 2009 NCWM Annual Meeting) 1 (b). Load Cell Creep Recovery (Editorial Suggestions) Next Sector Meeting Appendix A - Recommendations for Amendments to Publication 140F Agenda Item 1.(a). Agenda Item 1.(b). Agenda Item 4. Agenda Item 5. Agenda Item 6. Agenda Item 9. Agenda Item 10. Agenda Item 11. Agenda Item 14 (a). Agenda Item 14 (b). Agenda Item 14 (d). Agenda Item 14 (e). Agenda Item 14 (f).
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Content	NTEP 2010 Final Report Appendix C – NTETC Weighing Sector NTEP - C14 Background: WMD recently received an inquiry from the Ohio NTEP lab regarding an interpretation on Scales Code paragraph S.1.2.2.1. that may, in some circumstances, conflict with the Table 3 footnote 1. (Technical Advisor Note: There appears to be only two references to e ≠ d in Publication 14, pages DES 17 for marking requirements and DES-19 in Table 3. Additionally, a checklist item that verifies compliance to S.1.2.2.1. was unable to be located.) Table 3. Parameters for Accuracy Classes – Footnote 1 For Class I and II devices equipped with auxiliary reading means (i.e., a rider, a vernier, or a least significant decimal differentiated by size, shape, or color), the value of the verification scale division “e” is the value of the scale division immediately preceding the auxiliary means. S.1.2.2.1. Class I and II Scales and Dynamic Monorail Scales. If e ≠ d, the verification scale interval “e” shall be determined by the expression: d < e < 10 d If the displayed division (d) is less than the verification division (e), then the verification division shall be less than or equal to 10 times the displayed division. The value of e must satisfy the relationship, e = 10k of the unit of measure, where k is a positive or negative whole number or zero. This requirement does not apply to a Class I device with d < 1 mg where e = 1 mg. If e ≠ d, the value of “d” shall be a decimal submultiple of “e,” and the ratio shall not be more than 10:1. If e ≠ d, and both “e” and “d” are continuously displayed during normal operation, then “d” shall be differentiated from “e” by size, shape, color, etc. throughout the range of weights displayed as “d.” (Added 1999) The initial question was could the value of e be something other than 10 d. WMD believes that the answer is yes and demonstrated in the following table (copied from R 76). The values of e, calculated following the d < e < 10 d rule d = 0.1 g 0.2 g 0.5 g e = 1 g 1 g 1 g e = 10 d 5 d 2 d Typically, NTEP applicants submit Class II devices where e = 10 d. However, an applicant has submitted a device with e = 5 d. The lab asked how are d and e going to be displayed when e = 5 and d = 0.1e or 0.2e. One possible solution is shown in the following example. Max: 12 kg e: 0.5 g d: 0.1 g nmax: 12 000 Class II Example of possible indications? 3.000 0 kg e is displayed normally 3.000 1 kg d is differentiated 3.000 2 kg d is differentiated 3.000 3 kg d is differentiated 3.000 4 kg d is differentiated 3.000 5 kg e is displayed normally 3.000 6 kg d is differentiated As shown, d would occupy the same location in the display as e therefore; both e and d can’t be continuously displayed in S.1.2.2.1. Additionally, Table 3 footnote one states that “e” precedes the auxiliary means.
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Following Datasheets	10-ntep-app-d-09-annual-final (20 pages) 10-ntep-app-d-11-annual-final (24 pages) 10-ntep-app-d-11-pub15-final (24 pages) 10-ntep-app-d-software-10-annual-final (22 pages) 10-ntep-app-e-09-annual-final (6 pages) 10-ntep-app-e-11-annual-final (6 pages) 10-ntep-app-e-11-pub15-final (6 pages) 10-ntep-app-e-belt-10-annual-final (20 pages) 10-ntep-app-f-10-annual-final (12 pages) 10-ntep-app-f-11-annual-final (6 pages)
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