Current Category: CN-JJF - National Metrology Technical Specifications JJF
This specification is applicable to the calibration of all types of weighing scales.
This specification applies to the calibration of field-milling (or rotating) atmospheric electric field instruments (hereinafter referred to as atmospheric electric field instruments) with a measurement range of (-100 to 100) kV/m.
This standard applies to the calibration of weight scales used to measure human body weight.
This specification is applicable to the calibration of medical liquid micro-flow pumps operating in a flow range of (0.1~100) mL/h. The calibration of multi-functional medical liquid flow pumps within this flow range can also be carried out in accordance with this specification.
This outline is applicable to the type evaluation of the split-flow transmission smoke meters (also known as opacimeters, opaque smoke meters, etc.) classified under code 46481000, and to the conformity inspection of approved models.
This outline is applicable to the type evaluation of thermal gas meters (hereinafter referred to as gas meters) classified and coded as 12220000, with natural gas as the measurement medium, a maximum working pressure of no more than 50 kPa, a maximum flow rate of no more than 160 m3/h, and a measurement principle based on heat transfer.
This specification is applicable to the calibration of magnetic field meters for DC magnetic fields ranging from 1 mT to 2.5 T.
This standard defines the commonly used terms and definitions in retroreflective measurement.
This standard is applicable to the preparation of technical specifications in the field of retroreflective measurement, and it can also be referenced and used in related fields.
This specification is applicable to the calibration of standard devices for retroreflection (reflective reflection) measurement. The retroreflection measurement system for detection can be used for reference.
This specification is applicable to the calibration of metal stress relaxation testing machines.
This specification applies to the calibration of associated method natural gas calorific value measuring instruments with a measurement range of 25 MJ/m3 to 50 MJ/m3.
The type evaluation outline is applicable to the type evaluation of digital AC energy meters classified and coded as 15260000.
This outline is applicable to the type evaluation of digital AC energy meters that are installed and used in 50 Hz or 60 Hz power grids, accessed via electronic transformers (ET) or standalone merging units (SAMU), and whose input complies with DL/T 860.92-2016 or GB/T 20840.9-2017 for digital sampling values.
This outline is not applicable to energy meters with analog input.