GB/T 7724-2008 in English

《GB/T 7724-2008电子称重仪表》由TC97（全国衡器标准化技术委员会）归口，主管部门为中国轻工业联合会。
本标准规定了作为衡器模块的电子称重仪表，包括称重指示器、用作指示器的个人计算机（ＰＣ）、模拟数据处理装置、数字数据处理装置、终端、数字显示器等装置的一般要求、计量要求、技术要求、测试方法、检验规则及标志、包装、运输、贮存等要求。
本标准适用于在非自动衡器中采用的以下装置：
―――称重指示器；
―――模拟数据处理装置，如数字化接线盒，ＡＤ 模块，数字式重量变送器等；
―――数字数据处理装置，如数据存储装置等；
―――终端，如ＰＣ，销售终端（ＰＯＳ）等；
―――数字显示器，如大屏幕显示器等。
本标准中，术语“电子称重仪表”包括以上装置。
本标准仅适用于非自动衡器的电子称重仪表。

1 Scope

This standard specifies the general requirements, metrological requirements, technical requirements, test methods, inspection rules as well as marking, packaging, transportation and storage requirements for electronic weighing meter (hereinafter referred to as meter), including devices such as weighing indicator (hereinafter referred to as indicator), personal computer (PC) used as indicator, analog data processing device, digital data processing device, terminal and digital display, as module of weighing instrument.

It is applicable to the following devices adopted in non-automatic weighing instruments:

——Weighing indicator;

——Analog data processing devices, such as digital junction box, AD module and digital weight convert device;

——Digital data processing device, e.g. data storage device;

——Terminals, such as PC and point of sale device (POS);

——Digital display, e.g. scoreboard;

In this standard, the term "electronic weighing meter" covers the above-mentioned devices.

This standard is only applicable to the electronic weighing meter of non-automatic weighing instrument.

Note 1: Various devices within the application scope can be provided with their own enclosures or be installed in other devices (e.g. weighing module, PC).

Note 2: In case that various devices within the application scope must be associated with software to meet the requirements of this standard, then this associated software is suitable for this standard no matter whether it has been installed in device.

Note 3: This standard is also applicable to weighing meters of weighing instruments (e.g. weighing principle-based moisture meter, densimeter) which are used to determine and measure other mass related value, quantity, parameter or characteristic.

Note 4: For certain device adopted in non-automatic weighing instrument, it is not required to implement all functions listed in this standard.

Note 5: Some metrological requirements and test methods in this standard are aimed at the weighing meter connected with resistance strain gage load cell of voltage output form; but their principles are also applicable to the weighing meter connected with load cell of other output forms (e.g. frequency amount, charge quantity).

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.

GB/T 191 Packaging-Pictorial Marking for Handling of Goods (GB/T 191-2008, ISO 780:1997, MOD)
GB/T 2423.37-2006 Environmental Testing for Electric and Electronic Products - Part 2: Test Methods - Test L: Dust and Sand (IEC 60068-2-68:1994, IDT)
GB/T 2423.38-2005 Environmental Testing for Electric and Electronic Products - Part 2: Test Methods - Test R: Water Test Method and Guidance (IEC 60068-2-18:2000, IDT)
GB 4208 Degrees of Protection Provided by Enclosure (IP Code) (eqv IEC 529:1989)
GB 4793.1-2007 Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use - Part 1: General Requirements (IEC 61010-1:2001, IDT)
GB/T 4857.5-1992 Packaging - Transport Packages - Vertical Impact Test Method by Dropping (eqv ISO 2248:1985)
GB/T 4857.10-2005 Packaging - Basic Tests for Transport Packages - Part 10: Sinusoidal Vibration Test Method Using at Variable Vibration Frequency (ISO 8318:2000, MOD)
GB/T 4857.20-1992 Packaging - Transport Packages - Bump Test Method
GB/T 6388-1986 Transport Package Shipping Mark
GB/T 13384-2008 General Specifications for Packing of Mechanical and Electrical Product
GB/T 14250-2008 Terminology of Weighing Instruments
GB/T 23111-2008 Non-automatic Weighing Instrument (OIML R76:2006, IDT)

3 Terms and Definitions

For the purposes of this standard, terms and definitions established in GB/T 23111-2008 and GB/T 14250-2008 as well as the following apply.

3.1 Construction

3.1.1

electronic weighing meter

the general term of the following electronic equipment as modules of weighing instrument:

——Weighing indicator;

——Analog data processing device;

——Digital data processing device;

——Terminal;

——Digital display.

Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 General Requirements
5 Metrological Requirements
6 Technical Requirements
7 Test Methods
8 Inspection Rules
9 Marking, Packaging, Transportation and Storage