This standard specifies the commonly used reference units, symbols and precision for the dimensions, performance parameters and other characteristic quantities of construction machinery, but does not include the specific measurement methods and instruments used. JB/T 7690-1995 Units and measurement precision for dimensions and performance of construction machinery JB/T7690-1995 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T7690-1995
eqvISO9248-1992
Engineering Machinery
Dimensions and Performance
Units and Measurement Accuracy
1995-06-20 Issued
Ministry of Machinery Industry of the People's Republic of China
1996-01-01 Implementation
JB/T7690-1995
This standard is based on the International Organization for Standardization ISO/TC127 Earthmoving Machinery Technical Committee The draft of ISO9248-19926 Earthmoving Machinery-Units and Measurement Accuracy of Dimensions and Performance is equivalent to that of the international standard, and the writing rules are the same. In this way, by adopting the international standard as the standard of my country, the units and measurement accuracy of the commonly used characteristic quantities in the measurement of scientific research, production, testing, inspection and measurement in my country's engineering machinery industry can be promoted and standardized to be internationally common, so as to adapt to the needs of international trade, technology and economic exchanges as soon as possible. According to the provisions of 4.2.3.2 of GB/T1.1-1993, the foreword of the international standard is retained, and the "foreword" is added. This standard is proposed and managed by Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. The drafting unit of this standard: Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard: Wu Runcai and Yang Yaoguo. JB/T 7690--1995
ISO (International Organization for Standardization) is a worldwide alliance of national standard groups (ISO member countries). The work of formulating international standards is usually carried out by ISO technical committees. Each member country has the right to participate in established technical committees and in subjects of interest: international organizations, governmental and non-governmental organizations in liaison with ISO may also take part in this work. ISO collaborates closely with the International Electrotechnical Commission (IEC) for electrotechnical standardization.
Draft international standards are circulated by technical committees to member countries for voting. Publication as an international standard requires at least 75% of the member countries to vote in favor.
International standard ISO9248 was drafted and developed by ISO/TC127 Technical Committee on Earthmoving Machinery and SC1 Technical Committee on Test Methods for Machine Performance.
Machinery Industry Standard of the People's Republic of China
Dimensions and Performance
Units and Measurement Accuracy of Construction Machinery
JB/T 7690·1995
eqv ISO 92481992
This standard specifies the reference units, symbols and accuracy commonly used for characteristic quantities such as dimensions and performance parameters of construction machinery, but does not include specific measurement methods and instruments used. This standard applies to engineering machinery defined in GB8498. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown in the following standards are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB310086wwW.bzxz.Net
International System of Units and Its Application
GB8170—87
Rules for Rounding Off Numerical Values
GB 8498—87
Basic Types of Earth-moving Machinery
3 Units
The basic units, auxiliary units and derived units used in engineering machinery shall comply with the provisions of Table 1. 4 Accuracy
The measurement accuracy shall comply with the provisions of Table 1.
5 Rounding
The measurement data shall be rounded according to the numerical rounding off rules specified in GB8170, and the accuracy of the rounded measurement value shall comply with the provisions of Table 1. Approved by the Ministry of Machinery Industry on June 20, 1995
Implemented on January 1, 1996
Basic unit
Auxiliary unit
Name of quantity
Angle 1
Temperature in degrees Celsius
Angular velocity
Acceleration
Sound pressure level
JB/T 7690-1995
Table 1 Accuracy requirements
Unit name
Celsius
Square meter
Cubic meter
Pascal
Radian per second
Meter per second
Meter per square second
Newton meter
Cubic meter per second
Decibel (reference value 20μPa)
Accuracy\
± 0.02rad
≤200℃：±1℃
>200C:±2%
1) Other units of the same characteristic quantity can also use the accuracy listed in the table. When the accuracy listed in the table cannot meet special requirements, it should be specified in the relevant standards, product drawings and design documents. This standard does not specify the large scale or small scale accuracy of the characteristic quantity or the accuracy of the precision measurement, which should be specified in the required standards, product drawings and design documents.
2) 1L=1dm.
Adoption instructions:
1 Angle, temperature and frequency are basic units in ISO9248. This standard lists them as auxiliary units and derived units respectively according to the provisions of GB3100.
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