INSTRUMENTATION • ELECTRONICS
still measuring on cables which are up to 24mm in diameter. Should it become too inconvenient to read the white backlight and crispy clear display, then an optional Bluetooth transmitter (Z3210) allows you to read (and of course also store) the measurement values on your smartphone. T e smallest of the fi ve current ranges is 60mA, with a guaranteed accuracy for values from 0.6mA. T e largest current range of the CM4001 is 600A, the frequency band is from 40Hz to 1kHz and the measurement category is CAT III 300V. Even though the current clamp is so small, it is packed with functions like auto-hold, min/max/average, or an inrush current measurement feature. T e CM4001 has been designed to be a small yet powerful and universal leakage current clamp, made to be used in small and confi ned spaces and requiring little room in your toolbox. Measuring 23.3cm from top to bottom, the CM4002 leakage current clamp is not only more than 7cm taller then the CM4001, it is also bigger in width and depth. T is is because the CM4002 has been designed to provide the most accurate measurement results while allowing it to be used on cables with a diameter of up to 40mm. As a result, the smallest of six current ranges of the CM4002 is just 6mA with a guaranteed accuracy for values from 0.06mA, while the largest current range is 200A. T e frequency band is also wider than that of its little brother, ranging from 15Hz to 2kHz, and the CM4002 complies to the IEC/EN 61557-13 standard which defi nes requirements for current clamps for measuring leakage currents in electrical installations, such as the protection against external magnetic fi elds (Class 2, magnetic fi elds ≤30A/m is what the CM4002 fulfi ls). T e third of the three leakage
current clamp siblings from Hioki is the CM4003. Comparing the CM4002 with the CM4003 side-by-side, it is not easy to spot the diff erences between them. T e physical dimensions are the same, and so are almost all technical specifi cations. It is easier to see the diff erences when comparing the two clamps side-by-side from a diff erent view. T e connector at the bottom of the CM4003 allows for a special adapter cable to be connected to the meter. T is adapter cable converts the 4-pin outlet of the CM4003 to these two connectors:
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The range of AC leakage current clamps
The CM4002 and CM4003 current clamps
• A standard USB-C socket which allows you to power the CM4003 externally in case you want to perform longer term measurements. T e power can come from an optionally available Hioki power supply unit, but nothing stops you from using any powerbank you would use to charge to charge your smartphone, for example.
• A standard (male) BNC connector allows to output the measured current as a voltage which you can feed it into a memory recorder like Hioki’s MR8870.
T e external connector of the CM4003 does impact its measurement category rating, which is CAT III 300V. In comparison, the CM4002 without the
connector has a rating CAT IV 300V/ CAT III 600V. T e adaptor cable for the CM4003 leakage current clamp is called L9097 and it is included with every CM4003. T e external USB power supply (Z1013) as well as the required USB-A- to-USB-C cable (L9510) are optional accessories. But again, the external power connector is a standard USB-C socket. All three Hioki CM400x leakage
current clamps are available as bundle versions which have the Z3210 Bluetooth transmitter already included, named CM400x-90.
Kai Scharrmann is at Hioki Europe.
www.hioki.eu
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