砝碼在*和美國的等級區(qū)分

在*：
1、砝碼有等級區(qū)分：E1、E2、F1、F2、M1、M11、M2、M22、M3，共9個等級。等與級的區(qū)別在于：
等是按照不確定度來分的，即等砝碼有修正值，級是按照示值誤差來分的，即級砝碼沒有修正值，只要其示值誤差在此范圍內(nèi)都有認為合格的。
2、其他：
天平砝碼：材質(zhì)種類— 無磁不銹鋼，非磁性不銹鋼，銅鍍鉻，鐵鍍鉻。
砝碼形狀— 圓柱體、圓錐體、板形、片形、圈（環(huán)）形、騎形、條（棒）形 
組合形式— 常規(guī)組合5、2、2、1，（可按用戶需求任意組合） 
*度等級— *等(E2)，二等(F1實差)， F1 (三級允差)，F(xiàn)2 (四級)， M1 (五級). M2(六級) 
成套規(guī)格（質(zhì)量范圍）20kg~10kg、10kg~1kg、5kg~1kg、2kg~1kg、2kg~1mg、1kg~1mg、500g~1mg、200g~1mg、100g~1mg、500mg~1mg(片碼)、500mg~10mg(圈碼)、50mg~1mg(圈碼) 
單只規(guī)格（標稱值）20kg、10kg、5kg、2kg、1kg、500g、200g、100g、50g、20g、10g、5g、2g、1g、500mg、200mg、100mg、50mg、20mg、10mg、5mg、2mg、1mg
3、目前,砝碼的等級劃分主要根據(jù)JJG99-1990《砝碼》的規(guī)定,分成兩等九級共十*個等級,其中包括了*等、二等、E1級、E2級、F1級、F2級、M1級、M11級、M2級、M22級和0級。
如果兼顧到大家以前對等砝碼的認同,也可以按照等級來劃分砝碼。
1. *等標準量具（砝碼）
1）*等標準砝碼。
2）E1等標準砝碼。
3）E1級標準砝碼。
4）E2等標準砝碼。
5）E2級標準砝碼。
2. 二等標準量具（砝碼）
1）二等標準砝碼。
2）F1等標準砝碼。
3）F1級標準砝碼。
3. 三等標準量具（砝碼）
1）F2等標準砝碼。
2）F2級標準砝碼。
4. 四等標準量具（砝碼）
1）M1等標準砝碼。
2）M1級標準砝碼。
3）M11等標準砝碼。
4）M11級標準砝碼。
5）M2等標準砝碼。
6）M22級標準砝碼。
7）M22等標準砝碼。
8）M22級標準砝碼。
5. 五等量具（砝碼）
只有*個0級砝碼。
*以,大家習(xí)慣老規(guī)程的五等砝碼時,可采用上述方法進行區(qū)分。
另外,新規(guī)程只有標準砝碼（等砝碼）和工作砝碼（級砝碼）之分。標準砝有修正值,而工作砝碼只有允差而沒有修正值。

砝碼在*和美國的等級區(qū)分

In America:
Introduction
The National Institute of Standards and Technology, Weights and Measures Division is asked numerous questions throughout the year regarding mass standards, specifications for mass standards, mass manufacturers, calibration intervals, availability of documents and publications, and sources of calibration. This paper summarizes the answers to many commonly asked questions.
Weight Classifications
There are three sources of weight classifications used in the United States. The most common are:
• NIST Class F; (NIST:*標注技術(shù)研究*的縮寫(National Institute of Standards and Technology) 它是美國商務(wù)部的*個)
• ASTM E 617-97, Classes 0 through 7; and (ASTM:美國材料與試驗協(xié)會的英文縮寫，其英文全稱為American Society for Testing and Materials)
• OIML R111, classes: E1, E2, F1, F2, M1, M2, M3.( OIML:*法定度量衡組織（International Organization for Legal Metrology）的法文簡稱) 
Please note: OIML F1 and F2 are NOT comparable to NIST Class F. The table comparing these standards shows the general correlation between the classifications and their typical usage. There is not yet a direct relationship between classifications in these specifications and the specifications have changed over time.
Class F. NIST Handbook 105-1 contains the specifications and tolerances for field standards used primarily in weights and measures and commercial applications (e.g., for testing scales when products are bought or sold over them). The standard is NOT designed to be an industry standard, although a number of industries use the specifications and tolerances for their applications.
ASTM E 617-97. The Federal government is required to use industry standards whenever available and wherever appropriate. It is for this reason that Circular 547, which contained specifications and tolerances for Classes M, S, S-1, P, etc, was not updated but was superseded in 1978 by ASTM E 617. A number of rather old requirements specify NBS Class S or Class S-1 weightsCthese should all be replaced by ASTM Class 1 or 2. The U.S. Pharmacopeia has changed its recommendations for pharmaceutical applications, but Federal agencies may not have changed their recommendations or regulations regarding weights. The latest revision of E 617-97 was a move toward harmonization with the OIML R111 which is currently undergoing revision. ASTM also has three standards that may be used for testing balances/scales for noncommercial applications: E 319, E 898, E 1270. All of these ASTM standards are available in Volume 14.02 of the ASTM Annual Standards.

砝碼在*和美國的等級區(qū)分