Current Category: CN-JJG - National Metrology and Inspection Regulations JJG
This procedure applies to the initial verification, subsequent verification, and in-use inspection of medical digital photography systems (DR) X-ray radiation sources on-site.
This regulation applies to ultrasound therapy equipment that generates continuous or quasi-continuous ultrasound energy with a sound working frequency range of 0.5 MHz to 5 MHz and an effective sound intensity of no more than 3 W/cm2, produced by plane circular ultrasonic transducers. Equipment using focused ultrasound probes is not applicable to this regulation.
This verification system table is applicable to the transfer of measurement values for power frequency voltage ratio measuring instruments. It specifies the transfer relationship of measurement values for power frequency voltage ratio measuring instruments from the measurement reference through various levels of measurement standards to the working measuring instruments, the measurement methods, and the measurement capabilities during the transfer of measurement values. When conducting calibration, this verification system table can also be used as the basis for traceability of measurement values.
This procedure is applicable to the initial verification, subsequent verification, and in-service inspection of standard current transformers with a rated frequency of 50 Hz (60 Hz). This procedure is also applicable to the verification of current transformers used for general measurement purposes.
This procedure is applicable to the initial verification, subsequent verification, and in-service inspection of DC current transformers installed in power systems for metering purposes.
This regulation applies to the initial verification, subsequent verification, and in-use inspection of standard voltage transformers with a rated frequency of 50 Hz (60 Hz). This regulation also applies to the verification of voltage transformers used for general measurement purposes.
This procedure is applicable to the initial verification, subsequent verification, and in-service inspection of wide-range current transformers installed in distribution network systems with a voltage rating of 35 kV or lower.
This procedure applies to the initial verification, subsequent verification, and in-use inspection of electrocardiographs (including analog electrocardiographs and digital electrocardiographs).
This procedure does not apply to the verification of vector electrocardiographs and dynamic electrocardiographs.
This verification system table is applicable to the transfer and traceability of measurement values for pulse waveform parameter measuring instruments. It includes the transfer and traceability relationships between SI unit basic quantities, pulse waveform parameter measuring reference instruments, pulse waveform parameter measuring standard instruments, and pulse waveform parameter working measuring instruments; the transfer and traceability methods; and the uncertainty requirements for transfer and traceability of measurement values.
This procedure applies to the initial verification, subsequent verification, and in-service inspection of installed AC energy meters with a nominal frequency of 50 Hz or 60 Hz and a nominal voltage not exceeding 600 V.
For energy meters with multiple tariffs, maximum demand, prepayment, and other functions (such as smart energy meters, multifunctional energy meters, and multi-tariff energy meters), the procedure specifies corresponding verification items. Other meters with the above-mentioned functions can refer to the verification items of the corresponding functions to implement this procedure.
This procedure does not apply to standard energy meters and digital energy meters (energy meters with measured voltage and current as digital quantities).
This procedure applies to the initial verification, subsequent verification, and in-use inspection of thermoelectric total radiation meters (hereinafter referred to as "total radiation meters") with analog signal output.
This procedure is applicable to the initial verification, subsequent verification, and in-use inspection of box-type ultrasonic flowmeters that use water as the medium and operate based on the time-difference ultrasonic method.