Current Category: CN-JJF - National Metrology Technical Specifications JJF
This calibration specification is applicable to the on-site calibration of array-type MIMUs, and non-array single MIMUs can be calibrated by referring to this specification.
This specification applies to the calibration of high-throughput gene sequencers (with a single sequencing length of ≤1,000 bp), but it does not apply to the calibration of gene sequencers based on Sanger sequencing technology and single-molecule sequencers primarily based on nanopore technology.
This specification is applicable to the calibration of ultrasonic burst sound signal sources operating in the frequency range of 20 kHz to 25 MHz.
This specification is applicable to the sound attenuation test of active noise-canceling headphones. For other audio devices close to the ear canal that have active noise-canceling functions, their sound attenuation tests can also refer to this specification for guidance.
This specification is applicable to the calibration of the gauge for measuring the range of (0~1 000)mm steel rulers.
This specification is applicable to the calibration of acoustic performance parameter measurement systems (free-field method) for underwater acoustic materials with a measurement frequency range of 500 Hz to 500 kHz, and under normal temperature and pressure conditions.
This standard applies to the calibration of high-voltage energy meters that directly measure the electrical energy on the high-voltage side in power systems with a voltage of 6 kV to 35 kV and a frequency of 50 Hz.
This specification applies to the calibration of air ultrasound imagers in the frequency range of 20 kHz to 100 kHz. The frequency range below 20 kHz can be used for reference purposes.
This specification applies to the calibration of DC high-voltage generators with a rated output voltage of 1 kV or higher.
This specification applies to the calibration of the acoustic performance parameter measurement system (using the traveling wave tube method) for underwater acoustic materials with a frequency range of 50 Hz to 4 kHz, a water temperature range of 5°C to 35°C, and a static water pressure range of 0.5 MPa to 10 MPa.
This specification applies to the calibration of digital display indicators with a resolution of 0.01 mm, a measurement range upper limit of more than 100 mm, a resolution of 0.001 mm, a measurement range upper limit of more than 30 mm, a resolution of 0.005 mm, a measurement range upper limit of more than 50 mm, and a resolution of 0.0005 mm, 0.0002 mm, and 0.0001 mm (hereinafter referred to as high-range indicators).
This standard applies to the acoustic performance testing of smart glasses with audio signal acquisition or output functions.