Yokogawa CL220 Clamp-On Tester

Description

Yokogawa CL220 Clamp-On Tester

Compact and Reliable AC/DC Current Measurement Solution

The Yokogawa CL220 represents the pinnacle of compact and highly functional current measurement tools, specifically engineered for technicians who require both alternating current (AC) and direct current (DC) capabilities in a portable format. As a Mini Clamp-on AC/DC Tester, the CL220 is designed to access confined spaces and measure currents quickly and efficiently, making it an indispensable instrument for electrical maintenance in tight panels and automotive systems. Its current measurement range extends up to 300A for both AC and DC signals, providing ample capacity for most standard industrial, commercial, and residential electrical installations. A defining characteristic of the CL220 is its use of the Mean Value detection method. While True RMS detection is preferred for highly distorted, non-sinusoidal waveforms, the Mean Value method is computationally simpler and faster, offering rapid and stable readings on more conventional, undistorted sine waves and DC signals. This optimization for speed and simplicity contributes to the unit’s overall efficiency and lightweight design. The CL220’s miniature physical profile does not compromise its measurement capacity or safety standards, positioning it as an ideal primary tool for field service engineers and repair specialists where quick verification of current flow is the key requirement. Its ability to handle both AC and DC current simultaneously expands its utility far beyond what standard AC-only clamps can offer.

Mean Value Detection Ensures Fast, Stable Readings

The technological foundation of the Yokogawa CL220 rests on the Mean Value detection method, a strategy specifically chosen to deliver immediate and stable measurements. This method calculates the average value of the rectified AC waveform and then scales it to match the RMS value for a perfect sine wave. For the majority of linear loads and DC circuits encountered in daily electrical maintenance, this approach provides sufficiently accurate and, more importantly, fast readings. The device’s output is displayed on a clear digital LCD with 3999 counts, ensuring adequate resolution to differentiate readings across its measurement range. The meter boasts a fast Response Time of approximately 2 seconds, which is critical for rapid diagnostic work and for capturing fluctuating signals. In terms of resolution, the CL220 offers high precision, particularly for its DC current function, with a DC Current Resolution of 0.01A on the 40A range. This fine resolution is vital for low-current applications such as testing the draw on control circuits or performing automotive battery drain checks, where minor current variations can be significant. The CL220 features Auto-range switching for all its functions, a convenience that automatically selects the most appropriate measurement scale, saving the user valuable time by eliminating manual range adjustments. This blend of quick Mean Value detection, high-resolution display, and automatic ranging makes the CL220 highly efficient for everyday testing scenarios.

Detailed Technical Ranges for Comprehensive Electrical Testing

The Yokogawa CL220 provides precise and reliable current measurement capabilities across both alternating and direct current spectra. For DC Current, the meter operates on two primary ranges: 40A and 300A, ensuring versatility from sensitive control circuits to standard power feeds. The same measurement ranges are applied to AC Current, also supporting 40A and 300A measurements. This dual-range structure allows the user to select the appropriate scale for maximum accuracy, though the integrated Auto-range function assists greatly in initial setup. The precision of the measurement is confirmed by its tolerance specifications: for DC Current, the accuracy is ±(1.5% reading + 5 digits) on the 40A range and ±(2.0% reading + 5 digits) on the 300A range. Similarly, for AC Current, the accuracy is ±(2.0% reading + 5 digits) on the 40A range and ±(2.5% reading + 5 digits) on the 300A range, typically specified at 50/60Hz. All measurement functions benefit from a reliable Data Hold function, which allows technicians to safely remove the meter from the conductor while retaining the last measured value on the display for detailed review and logging. This functionality is crucial for safety and efficiency, particularly when accessing conductors in awkward or hard-to-reach locations. The CL220’s defined technical ranges ensure it is adequately equipped to handle a large portion of common electrical current measurement tasks in both maintenance and troubleshooting capacities.

Prioritizing Safety and Durable Field Construction Standards

Despite its compact size and light weight, the Yokogawa CL220 maintains strict adherence to rigorous international safety and durability standards. The instrument is officially approved for conformity to safety regulations EN61010-1, EN61010-2-031, and EN61010-2-032. These certifications grant the CL220 a significant safety rating of CAT. III 300 V, making it suitable for direct measurements on distribution boards, circuit breakers, and internal wiring of fixed installations. An essential safety feature is the instrument’s withstanding voltage capability of 3.7 kV AC for one minute, offering a robust buffer against unexpected voltage surges and transients. The maximum allowable measurement circuit voltage is 300 Vrms or less. The CL220 is constructed to minimize measurement errors caused by environmental factors; specifically, the Influence of an external magnetic field is restricted to 1A or less at 400 A/m, ensuring reliability even near magnetic sources. Furthermore, the Influence of conductor position is tightly controlled to ±(2% rdg + 5dgt) or less, which assures accurate readings regardless of how the conductor is positioned within the jaw. Its durable construction allows for an operating environment of 0 to 40°C and up to 90% RH or less (non-condensing). This commitment to robust construction and high safety ratings ensures that the CL220 is not only highly portable but also a reliable and secure tool for professional use.

Excellent Ergonomics Defining Lightweight Portability

The Yokogawa CL220’s design is a testament to superior ergonomic engineering focused on maximizing portability and ease of use in the field. With minimal dimensions of approximately 59 (W) x 147 (H) x 25 (D) mm, it is truly a pocket-sized instrument, easy to carry and handle with one hand. Weighing in at only approximately 100 g (including batteries), the CL220 reduces user fatigue during extended periods of use. Its lightweight nature makes it the ideal tool for climbing ladders, navigating crawl spaces, or working in elevated positions where heavier equipment poses a challenge. A crucial aspect of its physical design is the 24 mm maximum diameter of the measurable conductor, which perfectly accommodates the standard wiring sizes found in small control panels, terminal blocks, and automotive engine bays. This compact jaw size is specifically optimized for tight access points that larger clamp meters cannot reach. To further enhance efficiency, the meter includes an automatic Sleep Function that powers down the unit in about 5 minutes after the last switch operation. This conserves the battery supply, ensuring the compact meter is ready for continuous use. The combination of its miniature form factor, lightweight construction, and critical features like the Data Hold function makes the CL220 an exceptional choice for technicians prioritizing accessibility and operational convenience.

Specialized Applications for Compact AC/DC Diagnostics

The unique blend of AC/DC capability, small size, and 300A range makes the Yokogawa CL220 essential for several specialized diagnostic sectors. First, in the automotive and heavy-duty vehicle industry, the CL220 is indispensable for measuring DC current draw from batteries, alternators, and parasitic loads in vehicle wiring harnesses. Its compact jaw fits easily around car cables that larger meters struggle with. Second, for solar panel installation and maintenance, the CL220’s DC measurement capability is crucial for verifying the DC string current from solar arrays before inversion, ensuring maximum power output. Third, in HVAC and refrigeration systems, it is frequently used to measure the operating current of small compressor motors, fan motors, and control circuitry, where panel access is often restricted. Fourth, for troubleshooting low-voltage control systems and PLCs, the fine DC current resolution (0.01A) allows engineers to accurately check the current consumption of relays, solenoids, and 24V DC control loops. Fifth, in facility maintenance and building management systems (BMS), the meter is ideal for non-intrusively checking the current on individual circuit runs within dense electrical distribution panels. These specific, high-value applications demonstrate why the CL220’s features are highly sought after in precise field engineering and technical service roles.

Power Efficiency and Standard Kit Configuration

Power management is key to maintaining the high portability and continuous readiness of the Yokogawa CL220. The meter operates on two readily available miniature batteries, either LR-44 x 2 or SR-44 x 2 (3V). Despite its capability, the CL220 exhibits low power consumption, with a typical consumed current of approximately 9 mA. This efficiency translates into a practical and respectable battery life of approximately 11 hours of continuous operation, ensuring that the meter remains functional throughout a standard workday. Further enhancing power conservation, the automatic Sleep Function powers down the unit after roughly 5 minutes of inactivity, preventing unnecessary battery depletion and extending the life cycle of the LR-44 batteries. The CL220 package is designed for immediate use, including all necessary components. The standard accessories are the two required batteries and a protective carrying case (Model 93033), which safeguards the instrument during transport and storage. User instructions are included in the User’s manual (IM CL235). The inclusion of a dedicated carrying case, despite the meter’s already durable construction, highlights Yokogawa’s commitment to providing a complete, ready-to-deploy solution, ensuring the miniature CL220 remains protected and its critical components are secure for demanding field environments.