Hioki CM4371: AC/DC Current Clamp Meter

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DESCRIPTION:

Hioki clamp meters are best-in-class measuring devices incorporating Hioki’s expertise in current sensing technology. Model CM4371 is a 600A True RMS clamp meter that features stronger jaws, broader -25℃ to 65℃ operating temperature range and IP54 dustproof and waterproof enclosure to enable professionals to work quickly in tough situations including the development, repair, and maintenance of equipment and devices such as electric vehicles. Additionally, the high-voltage DC measurement capability of up to 1700 V (*1) is ideal for the clamp maintenance inspections of electrical and solar power equipment.

CAT IV 600 V, CAT III 1000 V

KEY FEATURES:

● Multiple measurement functions
● Automatic AC/DC function helps boost work efficiency
● Measure DC voltages of up to 1700 V (*1)
● Simultaneously measure inrush current in RMS and crest values
● Expanded -25 °C to 65 °C operating temperature range
● IP54 dustproof and waterproof enclosure *Jaws (current sensor portion): IP50
The CM4371 has a rated current of 600 A, while the CM4373 has a rated current of 2000 A.

PRODUCT FEATURES:

1. Automatic AC/DC detection
When the user sets the rotary switch to the current measurement or voltage measurement position, the CM4371 and CM4373 will automatically detect whether the current being measured is AC or DC. This feature helps prevent measurement errors by eliminating the need to operate the switch in areas where lines carrying AC and DC currents are intermingled.
2. Inrush current measurement
The CM4371 and CM4373 can simultaneously measure and display RMS and maximum wave height values for inrush currents generated by starting motors and welding equipment. Since they also automatically detect and measure the duration of the inrush current, the instruments are capable of more accurate measurement than clamp-on meters whose measurement interval is fixed to 100 ms.
3. Damage-resistant jaws (current sensor)
Hioki reviewed the design of the jaws (current sensor) for both the CM4371 and CM4373 to improve strength. As a result, the warranty has been extended to 30,000 open/close cycles (up from 10,000 in legacy models), enabling operators to use the instrument for longer periods of time.
4. Broader operating temperature range (-25C to 65C) and improved durability
Whereas the legacy model (3285-20) has an operating range of 0C to 40C, the CM4371 and CM4373 have an operating temperature range of -25C to 65C, enabling their use in subzero and hot environments.
5. Product design that yields improved operability and convenience
In keeping with Hioki’s commitment to providing customers worldwide with high-quality products that have been developed and manufactured in the city of Ueda in Japan’s Shinshu region, the CM4371 and CM4373 have been designed to deliver enhanced operability and convenience based on customer needs.
Both models’ rotary switch is designed so that it can be operated single-handed while wearing work gloves. In addition, the instruments incorporate a white backlight so that measured values are visible even in dim locations and a display with a wide viewing angle so that measured values can be read from any angle.
6. IP54 dustproof and waterproof enclosure
The CM4371 and CM4373 feature an enclosure that delivers IP54-level dustproof and waterproof protection*, ensuring that measurement functionality can be maintained despite exposure to particulate matter such as dust and sand as well as water droplets. (The legacy 3285-20 does not deliver this level of protection.)
*Jaws (current sensor): IP50
7. CAT IV (600 V) safety for an expanded range of measurement targets
To facilitate the safe use of measuring instruments, the IEC 61010 safety standard establishes measurement categories ranging from CAT II to CAT IV based on the locations in which the instrument is used. Higher category numbers indicate a broader range in which measurement is possible.
Whereas the legacy 3285-20 was compatible with CAT III (600 V) applications, the CM4371 and CM4373 are designed for use in CAT IV (600 V) environments. This additional level of protection allows them to be applied safely to service lines and distribution panels with terminal-to-ground voltages of up to 600 V.
8. High-voltage DC measurement capability
Whereas the legacy 3285-20 was able to measure DC voltages of up to 600 V, the CM4371 and CM4373 can measure up to 1700 V. As a result, the instruments can be used in no-load voltage inspections of solar power equipment, an area where there is an increasing level of need in the market.

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