Current Category: CN-JJG - National Metrology and Inspection Regulations JJG
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of extrusion-type melt flow rate meters.
This regulation applies to the initial verification, subsequent verification, and in-use inspection of electronic pricing scales with a maximum weighing capacity of no more than 100 kg, which are classified into the medium accuracy grade and the ordinary accuracy grade.
This verification system table is applicable to the transfer and traceability of measurement values for terahertz radiation power measurement instruments. It specifies the purpose of the national reference standard for terahertz radiation power, the basic components of the reference standard, the technical specifications of the reference standard, the basic components of the terahertz radiation power standard, the operating range and measurement uncertainty, and the procedure for transferring measurement values to terahertz power meters of different accuracy levels.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of bell-type gas flow standard devices (hereinafter referred to as "bell-type devices") whose testing medium is air.
This regulation applies to the initial and subsequent verification of heat meters with a nominal diameter (referred to as the diameter) of no more than 400 mm, which use water as the medium.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of milliwatt-level standard ultrasonic power sources with a frequency range of (0.5~25) MHz and an ultrasonic power range of (1~500) mW.
This regulation applies to the initial verification, subsequent verification, and in-use inspection of X-ray radiation sources used for simulation positioning before or during radiotherapy. The operating voltage of its high-voltage generator does not exceed 400 kV.
This regulation does not apply to X-ray radiation sources that utilize computed tomography (CT) simulation positioning technology.
This regulation applies to the initial verification, subsequent verification, and in-use inspection of wheel gauge gauges for railway locomotives and rolling stock.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of wheel diameter measuring devices for railway locomotives and rolling stock.
This regulation applies to the initial verification, subsequent verification, and in-use inspection of the volume of tank containers used for transporting liquid and liquefied gas products. Other tank container volume verifications can be implemented with reference to this regulation.
This regulation applies to the initial inspection, subsequent inspections, and in-service inspections of liquefied gas railway tank cars.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of portable, mobile, and fixed instruments used to measure the ambient X and γ radiation air kerma rate. The air kerma rate K·a is generated by external X and γ radiation, with the X and γ radiation energy range being 80 keV to 15 MeV; the air kerma rate range is not less than 30 nGy/h to 30 μGy/h. This procedure is not applicable to the verification of instruments used to measure the ambient X and γ radiation air kerma (cumulative dose), nor to the verification of passive detection devices such as film dosimeters, thermoluminescent dosimeters (TLDs), optically stimulated luminescence (OSL) dosimeters, radium-platinum-luminous (RPL) dosimeters, or quartz wire electrometers. It is also not applicable to measurement systems for β and neutron radiation.