Current sensor standards and ratings

Current sensor standards and rating system covers certification specifications, performance indicators, industry application requirements and other dimensions, the following is a detailed analysis:

1. Certification standards and compliance

1）International standard

IEC 61869:

The accuracy of the current sensor under rated conditions should be less than 1%, covering the requirements of electrical safety, electromagnetic compatibility （EMC） and environmental adaptability.

IEC 62368-1:

To enhance the isolation function, the sensor is required to provide dual isolation barriers in high-voltage scenarios （such as electric vehicle chargers）， and the certified product must be UL/IEC certified.

2）Domestic certification system

GB 4793 series standard:

It is performed by China Quality Certification Center （CQC） and covers electrical safety, structural strength and electromagnetic compatibility testing of handheld current sensors.

3） Industry-specific certification

Automotive Electronics （AEC-Q100） :

The sensor is required to have no performance attenuation in the range of -40 ° C to 150 ° C, and is suitable for high-voltage scenarios such as vehicle charger （OBC）。

Medical devices （ISO 13485） :

Emphasis on low noise and high isolation （such as current monitoring in MRI equipment） to ensure patient safety.

2. performance rating and core indicators

1）Accuracy level

Grade accuracy range Typical application scenarios

Metrology level ≤1 ppm National laboratory calibration, reference source

Measurement level 1—— 10ppm precision instruments, new energy equipment testing

Industrial control level 0.01%——0.03% motor drive, industrial power monitoring

2） Key performance indicators

Linearity:

Proportional deviation between output and input current, linearity of high-end sensors （such as LEM products） ≤0.02%.

Temperature drift:

Change rate of gain/zero point with temperature, industrial sensors should be less than 50 ppm/K.

Response time:

Signal delay, closed-loop Hall sensors （such as MLX91220） respond ≤ 2μs.

Isolation voltage:

Enhanced isolation sensors （such as the SOIC16 package） offer 1415V basic isolation +707V enhanced isolation.

3） Test method

Laboratory tests:

Zero calibration: compensates for initial error.

Temperature cycle: Test output stability in the range of -40℃——85℃。

Field verification:

Long-term drift monitoring: Run under typical conditions for several months to assess output changes.

Anti-interference test: Verify the stability of the sensor in electromagnetic interference （EMI） environment.

3. Industry application standards

1） Power system

IEC 61850:

Sensors are required to maintain stability in extreme temperature and humidity and strong electromagnetic interference environments for smart grid monitoring.

2） Automotive electronics

ISO 16750:

The sensor is required to pass mechanical vibration, salt spray corrosion and other tests to ensure reliability in the vehicle environment.

3） Medical equipment

IEC 60601:

Limit leakage current ≤ 10μA, prevent the risk of electric shock, suitable for cardiac monitors and other devices.

4. Market rating reference

Positioning brand representative characteristics

High-end market Swiss LEM, German VAC accuracy ≤0.1%, expensive, for laboratory calibration

Mid-market domestic core Sen, Galaxy electrical accuracy 0.01%——0.1%, cost-effective, covering industrial and new energy

Industrial-grade Compson and Melai focus on stability and anti-interference, followed by accuracy

Selection suggestion

Laboratory/Calibration scenarios: metrological sensors （such as the Najiv CTA series） are preferred.

Industrial automation: Use of industrial control sensors （such as Sinsen CTB series） to balance accuracy and cost.

High voltage applications: Choose an enhanced isolation sensor （such as the MLX91220） to ensure safety certification.

Extreme environments: Verify that the sensor complies with industry standards such as AEC-Q100 or IEC 60601.

By matching specific requirements and standard systems, sensor performance and reliability are maximized.

2025-03-20 15:24