砝码在*和美国的等级区分

砝码在*和美国的等级区分

在*：
1、砝码有等级区分：E1、E2、F1、F2、M1、M11、M2、M22、M3，共9个等级。等与级的区别在于：
等是按照不确定度来分的，即等砝码有修正值，级是按照示值误差来分的，即级砝码没有修正值，只要其示值误差在此范围内都有认为合格的。
2、其他：
天平砝码：材质种类— 无磁不锈钢，非磁性不锈钢，铜镀铬，铁镀铬。
砝码形状— 圆柱体、圆锥体、板形、片形、圈（环）形、骑形、条（棒）形
组合形式— 常规组合5、2、2、1，（可按用户需求任意组合）
*度等级— *等(E2)，二等(F1实差)， F1 (三级允差)，F2 (四级)， M1 (五级). M2(六级)
成套规格（质量范围）20kg~10kg、10kg~1kg、5kg~1kg、2kg~1kg、2kg~1mg、1kg~1mg、500g~1mg、200g~1mg、100g~1mg、500mg~1mg(片码)、500mg~10mg(圈码)、50mg~1mg(圈码)
单只规格（标称值）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,砝码的等级划分主要根据JJG99-1990《砝码》的规定,分成两等九级共十*个等级,其中包括了*等、二等、E1级、E2级、F1级、F2级、M1级、M11级、M2级、M22级和0级。
如果兼顾到大家以前对等砝码的认同,也可以按照等级来划分砝码。
1. *等标准量具（砝码）
1）*等标准砝码。
2）E1等标准砝码。
3）E1级标准砝码。
4）E2等标准砝码。
5）E2级标准砝码。
2. 二等标准量具（砝码）
1）二等标准砝码。
2）F1等标准砝码。
3）F1级标准砝码。
3. 三等标准量具（砝码）
1）F2等标准砝码。
2）F2级标准砝码。
4. 四等标准量具（砝码）
1）M1等标准砝码。
2）M1级标准砝码。
3）M11等标准砝码。
4）M11级标准砝码。
5）M2等标准砝码。
6）M22级标准砝码。
7）M22等标准砝码。
8）M22级标准砝码。
5. 五等量具（砝码）
只有*个0级砝码。
*以,大家习惯老规程的五等砝码时,可采用上述方法进行区分。
另外,新规程只有标准砝码（等砝码）和工作砝码（级砝码）之分。标准砝有修正值,而工作砝码只有允差而没有修正值。

砝码在*和美国的等级区分

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:*标注技术研究*的缩写(National Institute of Standards and Technology) 它是美国商务部的*个)
• ASTM E 617-97, Classes 0 through 7; and (ASTM:美国材料与试验协会的英文缩写，其英文全称为American Society for Testing and Materials)
• OIML R111, classes: E1, E2, F1, F2, M1, M2, M3.( OIML:*法定度量衡组织（International Organization for Legal Metrology）的法文简称)
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.

砝码在*和美国的等级区分