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 general-purpose counters with a frequency measurement range of less than 18 GHz.
This procedure applies to the initial verification, subsequent verification, and in-use inspection of Class 1 and Class 2 environmental noise automatic monitors (hereinafter referred to as "monitors").
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of railway track inspection instruments (hereinafter referred to as "track inspection instruments"). It can also be used for the verification of track gauge and super-elevation parameters of track geometry measurement instruments.
This procedure applies to the initial verification, subsequent verification, and in-use inspection of the railway track inspection instrument verification bench (hereinafter referred to as the "verification bench").
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of metrological standards for corneal curvature meters.
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 inspection, subsequent inspections, and in-use inspections of liquefied gas railway tank cars.
This regulation applies to the initial verification, subsequent verification, and in-use inspection of fixed-scale working glass float gauges, such as density meters, oil density meters, alcohol meters, sugar meters, milk meters, soil meters, etc. (hereinafter referred to as float gauges).
This regulation does not apply to the verification of oil density meters with a low density range of less than 650 kg/m³.
This regulation applies to the initial verification, subsequent verification, and in-use inspection of fixed-quality standard glass float gauges (hereinafter referred to as float gauges), including first-class standard density gauges, second-class standard density gauges, first-class standard seawater density gauges, first-class standard alcohol gauges, second-class standard alcohol gauges, first-class standard sugar quantity gauges, and second-class standard oil density gauges.
The verification of low-density range standard oil density gauges with a density less than 650 kg/m3 is not applicable.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of all types of objective and subjective ophthalmometry devices.
This procedure is applicable to the initial verification (the verification after repair is considered as the initial verification, and the same applies hereinafter), subsequent verification, and in-use inspection of moisture determination instruments using the drying method for the purpose of detecting moisture content. These moisture determination instruments are mainly used to determine the moisture content of samples with relatively stable physical and chemical forms.