Current Category: CN-JJF - National Metrology Technical Specifications JJF
This calibration specification is applicable to the calibration of ionization vacuum gauges used in new production and applications. It is also applicable to the separate calibration of the regulators and circuits of thermionic ionization vacuum gauges.
This standard is intended for use in the formulation and amendment of metrological technical regulations. It can also be used as a reference in other aspects of metrology work and related scientific fields.
This calibration standard is applicable to the calibration of thermal conductivity vacuum gauges used for work (hereinafter referred to as the vacuum gauges to be calibrated).
Considering the practical application, when implementing this standard, the two inspection procedures, JJG 587-1989 and JJG 737-1991, shall be repealed simultaneously.
This calibration specification is applicable to the calibration of the dynamic response characteristics of contact temperature sensors used to measure fluid temperature. Temperature sensors mainly include thermistors and thermocouples. The temperature range is from room temperature to 1,700 ℃, and the fluid velocity range is from 0.4 m/s to a Mach number of Ma = 0.05 to 0.95.
In order to further improve China's legal metrology management, achieve the scientific management of metrological standards and the standardization of metrological information management, the "Naming Norms for Metrological Standards (Trial)" (hereinafter referred to as the "Norms") have been formulated.
This norm is mainly applicable to the naming of metrological standard instruments in the assessment of metrological standards.
This standard applies to the commercial quality static measurement of liquid petroleum products in vertical oil tanks, horizontal oil tanks, railway tank cars, and automobile tank cars, etc.