Product Jan. 26, 2024

Finger-Sized and High-Accuracy Current Sensors Support the Calculation of Scope 3 Greenhouse Gas Emissions

Hioki E.E. Corporation has a long history of leading the market of power measurement and analysis with its current sensor and measurement instruments. To further this trend into a new era, we are proud to announce a new lineup of high-accuracy, compact current sensors, and modules for data loggers. These products demonstrate Hioki’s dedication to technological innovation. Moreover, they play a vital role in advancing our commitment to a sustainable society, aligning with our efforts to address Scope 3 emissions and reduce greenhouse gases. 

AC/DC Current sensor (for Data Loggers) CT7812 (2 A), CT7822 (20 A)
Current Modules (for Data Logger LR8450-series) U8556, LR8536 (wireless model)
AC/DC Current probe (for Power Analyzers) CT6830 (2 A), CT6831 (20 A)

In order to prevent global warming, there is a demand for the reduction of greenhouse gas (GHG) emissions, including CO2. For products such as electric vehicles (EVs) and electrical appliances, considering the total greenhouse gas emissions throughout their life cycle, from production to disposal, holds great importance for companies. Scope 3 is one such category of emission calculations indicated by the GHG Protocol(*1), focusing on greenhouse gases emitted during raw material procurement and after sales.

  • *1:GHG Protocol []

In the calculation of emissions during the lifecycle of EVs, the measurement of power consumption plays a significant role. In EVs, a substantial portion of the energy consumption is attributed to the drive motors. However, to calculate the total power consumption, it is also crucial to consider other electrical systems such as LED lights and power windows, as well as control system components like electronic control units (ECUs). Optimizing the energy consumption of various onboard components forms the foundation for reducing indirect emissions.

Until now, precisely measuring the power of each vehicle component has been challenging due to several issues. These include the uncoordinated operation timing among multiple components, the constant miniscule current known as leakage or stand-by current when components are off, and the challenges posed by harsh environments resulting from high or low temperatures.

As a leading company in high-precision current sensors, Hioki has been indispensable in the EV power measurement market, providing substantial value. To support the calculation of Scope 3 emissions aimed at reducing greenhouse gases, Hioki continues to contribute with its superior current measurement technology.

Solution with Compact Current Sensors and Data Logger

The new current sensors CT7812 (2 A) and CT7822 (20 A) are high-accuracy, finger-sized current sensors with excellent temperature stability, thanks to fluxgate technology. These sensors enable highly accurate current values to be measured by the modules U8556 or LR8536 (wireless) and recorded by the LR8450-series data logger. Due to their compact size, they can easily access wires even in the tight spaces of a vehicle's wiring box, making them suitable for simultaneous current measurements of multiple components. They also enable high-accuracy measurements for tasks such as assessing the appropriateness of fuse ratings and recording leakage currents when the EV is turned off.

In addition to the innovative current sensors mentioned above, Hioki offers a battery-operated and wireless module LR8536 that frees operators from complex wiring tasks, leading to reduced labor. Furthermore, the data logger LR8450-series can accommodate modules for acquiring not only current data but also temperature, strain, CAN signals, etc. This wide range of choices allows for the simultaneous, long-term recording of various data such as component temperatures, air conditioning, and shaft rigidity.

Solution with Current Probes and Power Analyzer

The current probes CT6830 (2 A) and CT6831 (20 A) are compact, high-accuracy products with excellent temperature characteristics, similar to the finger-sized current sensors mentioned earlier. Hioki’s power analyzers have traditionally had an advantage in analyzing drive systems. These new current probes now empower our power analyzers to also perform comprehensive power analysis of components, including control devices and accessories. Their broad operating temperature range and minimal influence of temperature on measurements result in high accuracy even under harsh conditions, such as in engine compartments during real-vehicle road tests.


With our history and reliability in high-accuracy current sensor technology, Hioki will continue to contribute to the realization of a sustainable and prosperous society. For more information about this or other solutions, please contact your closest Hioki representative through our contact form. We look forward to hearing from you.


Measurement of Leakage Current in EV Power Management

Power Consumption Improvement in EV Development

Accelerate product development for Scope 3 emission reduction





MEMORY HiLOGGER LR8450-01 (Wireless LAN model)



Established in 1935, HIOKI E.E. CORPORATION (TSE: 6866) has grown to become a world leader in providing consistent delivery of test and measuring instruments through advanced design, manufacturing, and sales and services. By offering over 200 main products characterized by safety and quality while meeting an expansive range of applications, we aim to contribute to the efficiency and value of our customers' work in research and development, production and electrical maintenance. Hioki products and services are available around the world through our extensive network of subsidiaries and distributors. For more information, visit us at