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 cesium atomic frequency standards (including cesium atomic clocks).
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of laboratory and portable film-coated electrode dissolved oxygen meters (hereinafter referred to as "instruments") with a measurement range of (0~20) mg/L.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of mechanical and electronic mud density meters. Other mud density meters with similar principles can be calibrated by referring to this procedure.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of pH meters.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of digital display-type measuring instruments with a resolution of no more than 0.5 μm and a measuring range of no more than 50 mm, as well as mechanical display-type measuring instruments with a graduation value of no more than 10 μm and a measuring range of no more than 25 mm.
This procedure is applicable to the initial inspection, subsequent inspection, and in-use verification of pointer-type indicators with a graduation value of 0.01 mm or 0.002 mm and a measuring range not exceeding 10 mm; pointer-type indicators with a graduation value of 0.001 mm and a measuring range not exceeding 5 mm; and digital-display indicators with a resolution of 0.01 mm, 0.005 mm, or 0.001 mm and a measuring range not exceeding 10 mm.
This procedure applies to the initial verification, subsequent verification, and in-use inspection of non-metallic tensile, compression, and universal testing machines (hereinafter referred to as testing machines).
Non-metallic tensile, compression, and universal testing machines primarily include small-load material testing machines, micro-force value testing machines, and testing machines for non-metallic materials such as leather, paper, rubber, plastics, and fibers.
This regulation applies to the initial and subsequent inspections of railway tank cars used for transporting liquid products (excluding railway tank cars for liquefied gases and railway tank cars for powdered goods).
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of double-piston pressure vacuum gauges with a measurement range of (-01 to 1) MPa.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of various school testing instruments.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of time interval generators with an output range of 10 ns to 10,000 s.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of electronic balances (hereinafter referred to as "balances").