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Hioki is a leading manufacturer of electrical measuring instruments and test equipment, providing precision solutions for power analysis, battery testing and industrial maintenance. Its portfolio includes digital multimeters, clamp meters, power analysers, battery testers, data loggers and insulation testers. Trusted by engineers, electricians and researchers worldwide, Hioki products support applications in energy, automotive, electronics manufacturing and electrical maintenance.
AC Leakage Clamp Meter for μA Leakage, 200 A
AC leakage clamp meter for μA leakage current measurements from 60 μA to 200 A, max. conductor diameter 40 mm, True RMS, 50/60 Hz filter, threshold alarm, CAT IV 300 V / CAT III 600 V, optional Bluetooth via Z3210
• μA leakage current measurements from 60 μA to 200 A
• Max. conductor diameter 40 mm
• 50/60 Hz filter for stable leakage current measurement
• Threshold alarm for leakage detection
• Optional Bluetooth communication via Z3210
• Detection of leakage currents causing nuisance RCD or GFCI tripping
• Troubleshooting earth leakage currents in electrical installations
• Inspection of installations according to IEC/EN 61557-13
• Measurement of cumulative leakage currents in circuits with multiple loads
• Leakage current testing in installations with inverters and switching power supplies
Leakage currents in electrical installations originate from equipment such as switching power supplies, filters, and inverters and are often below the measurement range of conventional clamp meters, making it unclear where the leakage current originates. The HIOKI CM4002 AC leakage clamp meter measures leakage currents down to 60 μA and enables evaluation of very small leakage currents in electrical installations.
The instrument provides six measurement ranges from 6 mA to 200 A AC, covering both leakage current and load current measurement. Leakage currents can be assessed in relation to RCD operation, while differential current corresponds to the residual current flowing to earth and load current indicates the current in individual conductors.
With a maximum conductor diameter of 40 mm, the CM4002 accommodates larger conductors and multi-core cables in distribution systems, where leakage currents from multiple circuits need to be measured. The instrument is designed for leakage current measurement under installation conditions as defined in IEC/EN 61557-13.
The CM4002 covers a frequency range from 15 Hz to 2 kHz, allowing measurement of higher-frequency leakage currents such as those generated by inverters and switching power supplies. A selectable 50/60 Hz filter suppresses higher-frequency components and isolates the leakage current relevant to RCD tripping.
A threshold alarm indicates when a defined leakage current level is exceeded and provides a pass or fail indication relative to a user-defined limit, supporting comparison with RCD tripping levels or installation limits.
The display shows current and frequency simultaneously. It is backlit and supports measurements in low-light environments. Additional functions include Auto Hold, Max/Min/Avg recording, inrush current measurement, and peak value recording for capturing transient current peaks.
Rated CAT IV 300 V / CAT III 600 V, the CM4002 is intended for measurements in fixed installations, distribution panels, and electrical systems in residential, commercial, and industrial environments.
Bluetooth communication is available using the optional Z3210 Bluetooth Adapter. Measurement data can be transferred to a smartphone or tablet for documentation and further processing, including annotation and report creation. Measured values can also be displayed in real time on a smartphone or tablet when the instrument is installed in locations where the display is not easily visible.
The Z3210 supports HID functionality, enabling direct input of measured values into Excel or other applications. In this mode, the adapter is recognized as a Bluetooth keyboard by the connected device.
Designed and manufactured in Japan. For decades, HIOKI has been developing current sensing technologies for precise measurement in electrical systems. Leakage clamp meters, clamp meters, and clamp multimeters are developed and manufactured at the company’s own facility in Nagano Prefecture, Japan. Close integration of development and manufacturing, along with control over sensor technology, mechanics, and electronics, defines the instruments in daily use.
• CM4002 AC Leakage Clamp Meter
• C0203 Carrying case
• Instruction manual
• Operating precautions
• 2 × LR6 (AA) alkaline batteries
• Z3210 Bluetooth Adapter
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