Current Category: CN-JJF - National Metrology Technical Specifications JJF
This standard applies to the calibration of infant radiant warming tables.
This specification applies to the calibration of oxygen permeability testers for plastic films and sheets based on the principles of equal-pressure method (Coulomb sensor method) and differential-pressure method (pressure sensor method) (hereinafter referred to as "oxygen permeability testers").
Note: Differential-pressure method is also commonly known as pressure differential method.
This specification is applicable to the calibration of desktop and portable water manganese index analyzers.
This standard applies to the calibration of fixed X-ray and gamma radiation dose rate monitors (devices) used for site monitoring with an energy range of at least 80 keV to 1.5 MeV.
This standard does not apply to the calibration of portable X-ray and gamma radiation dose equivalent rate meters and X-ray and gamma radiation air kerma rate meters.
This standard applies to the measurement of the oil quantity in pressurized tanks, such as vertical metal tanks, horizontal metal tanks, railway tank cars, automobile fuel tankers, and marine liquid cargo measuring tanks, for petroleum and liquid petroleum products.
Note: Marine liquid cargo measuring tanks are referred to as "ship tanks". Vertical metal tanks, horizontal metal tanks, railway tank cars, automobile fuel tankers, and marine cargo measuring tanks are collectively referred to as "tanks". Petroleum and liquid petroleum products are collectively referred to as "oil products". The volume or mass of oil products is referred to as "oil quantity". Tanks used to store oil products are referred to as "oil tanks".
This standard applies to the calibration of various measuring instruments for the speed of internal combustion engines and compression ignition engines of motor vehicles. Other non-road mobile diesel engine speed measuring instruments can also be calibrated in accordance with this standard.
This specification applies to the calibration of gold-platinum thermocouples with a protective sleeve length of not less than 600mm within a temperature range of (0~1000)℃. The calibration of thermocouples with non-protective sleeve structures can be carried out in accordance with this specification.
This specification is applicable to the calibration of surface platinum resistance thermometers with a temperature range of -60°C to 600°C.
Other types of surface resistance thermometers can refer to this specification for calibration.
This specification is applicable to the calibration of filter integrity testers.
This specification is applicable to the calibration of the sound pressure reflection coefficient of underwater acoustic material samples using the standing wave tube method within a measurement frequency range of 100 Hz to 4 kHz.
This specification is applicable to the calibration of airborne tritium monitoring instruments that use direct measurement methods.
This specification is not applicable to airborne tritium monitoring instruments (devices) that collect tritium on adsorbers or traps for measurement, nor to cases where airborne tritium is collected as a liquid sample and then measured using a liquid scintillation counter.
This specification is applicable to the calibration of DC magnetic shielding cylinders (hereinafter referred to as magnetic shielding cylinders) with a residual magnetic field of 0.1nT to 100nT.