Current Category: CN-JJG - National Metrology and Inspection Regulations JJG
This procedure is applicable to the initial and subsequent verification of online vibration tube liquid density meters (hereinafter referred to as liquid density meters).
This regulation applies to the inspection of the braking performance of flat-type brake test benches and flat-type brake-axle repeatability test benches (hereinafter referred to as brake test benches) used for vehicle inspections.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of formaldehyde gas detectors (hereinafter referred to as "instruments") used to measure the formaldehyde content in the air.
This procedure applies to the initial verification, subsequent verification, and in-use inspection of the leakage current testing part of AC/DC leakage current testers (or measuring instruments) and comprehensive safety performance test devices.
This procedure does not apply to the breakdown current testing of voltage withstand testers, or the verification of component leakage current testers and electrical leakage protection testers.
This regulation stipulates the metrological performance requirements, general technical requirements, inspection items, and inspection methods for dedicated axle (wheel) weighing instruments for motor vehicle inspection (hereinafter referred to as "axle (wheel) weighing instruments").
This regulation applies to the initial inspection, subsequent inspections, and in-use verification of dedicated axle (wheel) weighing instruments for motor vehicle inspection.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of transmissive black-and-white density films that are newly manufactured and in use. The requirements for metrological performance in the type evaluation of black-and-white density films can be implemented in accordance with this procedure.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of exhaled breath alcohol detectors.
This procedure is applicable to the initial verification, subsequent verification, and in-service inspection of neutron ambient dose equivalent (rate) meters. The verification and calibration of other neutron dose measurement instruments can also be used as a reference for these operations.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of mechanical lever balances (hereinafter referred to as "balances").
1.1 This procedure applies to weights of accuracy grades E1, E2, F1, F2, M1, M12, M2, M23, and M3 ranging from 1mg to 5000kg. Weights of each accuracy grade should be equipped with corresponding metrological instruments for use. They can be used to verify weights and weighing instruments of lower accuracy grades. In practical use, the nominal value of the weights can be expanded upward or downward within the corresponding accuracy grade as needed.
1.2 This procedure applies to the initial verification (verification after repair is considered as initial verification, and the same applies hereinafter) and subsequent verification of various weights.
1.3 The definitions of weight accuracy grades are as follows:
1.3.1 E1-grade weights (formerly known as working reference-grade weights): Traced to national reference standards and secondary reference standards, used for verifying the transfer of E2-grade weights, for verifying corresponding weighing instruments, and for use with corresponding weighing instruments.
1.3.2 E2-grade weights: Used for verifying the transfer of F1-grade and lower weights, for verifying corresponding weighing instruments, and for use with corresponding weighing instruments.
1.3.3 F1-grade weights: Used for verifying the transfer of F2-grade and lower weights, for verifying corresponding weighing instruments, and for use with corresponding weighing instruments.
1.3.4 F2-grade weights: Used for verifying the transfer of M1-grade, M12-grade, and lower weights, for verifying corresponding weighing instruments, and for use with corresponding weighing instruments.
1.3.5 M1-grade weights: Used for verifying the transfer of M2-grade, M23-grade, and lower weights, for verifying corresponding weighing instruments, and for use with corresponding weighing instruments.
1.3.6 M2-grade weights: Used for verifying the transfer of M3-grade weights, for verifying corresponding weighing instruments, and for use with c
This regulation applies to the initial verification, subsequent verification, and in-use inspection of electronic parking meters that use IC cards or magnetic cards as storage media for payment.
This regulation applies to the initial verification, subsequent verification, and in-use inspection of corneal curvature meters, and also applies to the single verification of optometry machines with curvature measurement functions.
The requirements and test methods for electrical safety performance are specified in GB 9706.1.