GB/T 321-2005 in English

VALID

Preferred numbers -Series of preferred numbers

Issued on:2005-05-16
Implemented on:2005-12-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $150.00
$146.00

Standard No:	GB/T 321-2005
Document status:	VALID
Title in English:	Preferred numbers -Series of preferred numbers
Title in Chinese:	优先数和优先数系
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2005-05-16
Implemented on:	2005-12-01
Superseding:	GB/T 321-1980 Preferred numbers and preferred number series
ICS Classification:	17.020-Metrology and measurement in general
Chinese Classification:	A20-Comprehensive Technology
Professional Classification:	GB-National Standard
Related Keywords:	preferred numbers preferred numbers -series numbers preferred basic series values
Related Topics:	priority energy good days number and Excellent and priority approval counting Water saving priority Optimization of parameters count first Yeast priority excellent first micro Excellent days per year number system america first GBT321 GBT321-1980 GBT321-2005 gb321 Priority valve test gb/t 321 gbt321

《GB/T 321-2005优先数和优先数系》由TC240（全国产品几何技术规范标准化技术委员会）归口，主管部门为国家标准化管理委员会
本标准规定了优先数系。本标准适用于各种量值的分级，特别是在确定产品的参数或参数系列时，应按本标准规定的基本系列值选用。

1 Scope

This standard specifies the series of preferred numbers.

This standard is applicable to grading of various quantity values, especially in determining product parameters or parameter series, and it shall be selected in accordance with basic series values specified in this standard.

2 Terms and Definitions

2.1
series of preferred numbers
preferred numbers are the conventionally rounded off term values of geometrical series, including the integral powers of 10 and having as ratios the following factors: and , in accordance with Table 1 - Basic Series and Table 2 - Complementary R80 Series set out for the 1 to 10 range, the series of preferred numbers being unlimited in both directions, the values of the terms in other decimal ranges are obtained by multiplying the values in the tables by positive or negative integral powers of 10

Foreword I
1 Scope
2 Terms and Definitions
3 Preferred Numbers