• Frequency bandwidth: DC to 500 kHz
• Rated current: 500 A AC/DC
• 20 mm diameter max clamp opening (0.79 inch)
• Power supplied via the measurement instrument
• The automatic phase correction function

Hioki's clamp-type AC/DC current sensors can be connected directly to Hioki Power Analyzers and Memory HiCorders. Also, it can be connected to Power Meters, Oscilloscopes, DMMs, etc., by using an optional sensor unit.

Use with an instrument with a high input impedance of 1 MΩ or higher.

Clamp-type sensors that eliminate the need to cut lines

Clamp-style current sensors can be affixed without cutting the line under measurement. Thanks to that design, they can measure current in applications where it’s not possible to cut lines, including testing of EVs on chassis dynamometers and evaluation of operational solar power systems.

The CT6840A series can measure current in operating vehicles since there’s no need to cut cables. Combined with a power analyzer, these instruments can accurately integrate current and power during the charging and discharging of system batteries in order to make WLTP-compliant fuel efficiency measurements.

While clamp-style current sensors are generally praised for their convenience, they usually pose disadvantages in terms of measurement precision. However, the CT6840A series delivers unparalleled measurement precision in a clamp-style design, allowing accurate measurement of DC power in battery-powered EVs and solar power systems.

Rated current/Frequency band/Diameter of measurable conductors

CT6841A: 20 A/DC to 2 MHz/φ20 mm or less

CT6843A: 200 A/DC to 700 kHz/φ20 mm or less

CT6844A: 500 A/DC to 500 kHz/φ20 mm or less

CT6845A: 500 A/DC to 200 kHz/φ50 mm or less

CT6846A: 1000 A/DC to 100 kHz/φ50 mm or less

Temperature characteristics are an issue for current sensors that can manage DC currents. The CT6840A series uses the flux gate detection method. Unlike the standard Hall element detection method, the flux gate method is more resistant to temperature variations, allowing instruments to accurately measure current in a variety of test environments.

The CT6840A series provides automatic phase correction for automatically correcting the current sensor phase just by connecting to the Power Analyzer PW8001. This function automates the configuration of phase correction values, a process that previously had to be carried out manually, eliminating settings errors and facilitating accurate power measurement. (All current sensors have phase characteristics, and the Power Analyzer performs phase correction so that power can be measured accurately.)