Yokogawa CL250 Clamp-on Tester

Description

Yokogawa CL250 Clamp-on Tester

The Definitive Clamp Meter For High Current Demands

The Yokogawa CL250 is meticulously engineered to stand as a heavy-duty, multi-functional clamp meter, purpose-built to meet the stringent requirements of professional electricians and industrial maintenance technicians dealing with high-capacity electrical systems. A fundamental distinction of the CL250 is its exceptional current measurement capability, extending up to a massive 2000A for both Alternating Current (AC) and Direct Current (DC). This expansive range positions the CL250 as the ideal instrument for analyzing large motor drives, main power distribution lines, and substantial battery bank installations, which typically surpass the limitations of conventional clamp meters. Furthermore, the meter accommodates these high currents with a commensurately large jaw capacity, capable of clamping around conductors up to 55mm in diameter. This crucial mechanical specification ensures that the CL250 can comfortably handle the thick cables and busbars commonly found in high-amperage industrial environments. The CL250 utilizes the Mean Value detection method. While high-end instruments often feature True RMS, the Mean Value approach in the CL250 provides a rapid, stable, and highly accurate representation of current and voltage, particularly effective in DC applications and for standard sinusoidal AC waveforms encountered in most power systems. This combination of powerful measurement range, mechanical accessibility, and efficient detection methodology establishes the CL250 as an indispensable asset for comprehensive electrical diagnostics and safety verification in demanding industrial settings.

Versatile Functions Define High-Level Electrical Diagnostic Capabilities

Beyond its primary function as a high-current clamp meter, the Yokogawa CL250 integrates a comprehensive suite of measurement functions that greatly expand its utility as a primary diagnostic tool. Technicians can execute standard voltage checks, with the CL250 capable of measuring both AC Voltage (ACV) and DC Voltage (DCV) across its range. The inclusion of an Ohmmeter (OHM) function allows for resistance checks, crucial for validating winding integrity or checking circuit continuity, which is further supported by an audible Continuity Check feature. For advanced system analysis, the CL250 includes measurement capabilities for Frequency (Freq.) and Temperature (°C), enabling technicians to troubleshoot systems that rely on speed or thermal regulation, such as HVAC controls or variable frequency drives. A particularly valuable and professional feature is the DC output capability, which allows the measured current value to be outputted as a scaled DC voltage signal. This feature is instrumental for recording data over time using external data loggers, oscilloscopes, or other recording devices that cannot directly interface with a high-current signal, thus enhancing data analysis and long-term monitoring efforts. All results are clearly presented on a bright LCD digital display with 3999 counts, offering sufficient resolution and clarity for precise reading. The robust functionality of the CL250 ensures it is a comprehensive testing instrument, reducing the need for multiple specialized meters in the field.

Measuring 2000A Current With An Expansive Jaw

The capacity to measure up to 2000A AC/DC is a hallmark feature that distinguishes the Yokogawa CL250 from standard commercial clamp meters, making it a powerful solution for heavy industrial applications. The instrument features dedicated ranges for high-current measurement: 400A and 2000A for DC Current. This dual-range system, complemented by manual range switching for current and voltage, allows the technician precise control over the measurement sensitivity. Crucially, the DC Current Resolution is 0.1A on the lower range, providing excellent detail for diagnostics where precise current tracking is essential, even when measuring high capacity systems. Complementing this electrical capacity is the CL250’s formidable mechanical design. The 55 mm maximum diameter of the measurable conductor is one of the largest in its class, specifically engineered to accommodate the thickest power cables, large bundle wires, and solid busbars commonly found in high-power distribution cabinets and heavy machinery. The expansive jaw ensures easy, non-intrusive access and reliable clamping force, which is critical for accurate measurements. Yokogawa has also meticulously minimized external influences on accuracy, limiting the Influence of conductor position to ±(1.5% reading + 3 digits) or less. This high level of accuracy, irrespective of the conductor’s placement within the jaw, guarantees reliable data, even in challenging environments where precise centering is difficult.

Intelligent Data Retention Maximizes Field Operational Safety

Operational efficiency and safety are significantly enhanced in the Yokogawa CL250 through its sophisticated suite of data management and retention features. The inclusion of Peak Hold functionality across all measurement ranges is vital for capturing and freezing the highest instantaneous surge current or voltage transient. This is particularly useful for analyzing inrush currents when starting large motors or transformers, allowing technicians to verify that protection circuits are adequately rated for the momentary but extreme current peaks. Similarly, the Max Hold feature, available on current and voltage ranges, automatically captures and stores the maximum stable reading over an extended measurement period, which is excellent for monitoring load variations without having to continuously watch the display. For standard static measurements, the Data Hold function allows the measured value to be frozen on the LCD, enabling the technician to safely remove the meter from a conductor in a difficult-to-reach location and review the reading at eye level. To conserve the meter’s long-lasting battery life, a practical Sleep Function is integrated, automatically powering down the unit approximately 10 minutes after the last switch operation. This intelligent power management maximizes operational availability. The combination of Peak Hold for transients, Max Hold for stable maximums, Data Hold for access safety, and the Sleep Function for battery preservation makes the CL250 a highly efficient and safe tool for complex diagnostic work.

Uncompromising Safety Standards For Demanding Industrial Environments

The Yokogawa CL250 is built upon a foundation of uncompromising safety, ensuring that its powerful 2000A measurement capability can be used securely in high-energy environments. The instrument has been rigorously tested and approved for conformity to a stringent set of international safety standards: EN61010-1, EN61010-2-031, and EN61010-2-032. These certifications confirm the meter’s readiness for professional use and assign it crucial safety ratings: CAT. III 600 V and CAT. II 1000 V. The CAT III 600 V rating signifies its suitability for measurements on distribution boards, branch circuits, and fixed installations up to 600 volts, while the CAT II 1000 V rating applies to lower-energy measurements on plug-in loads. A critical safeguard built into the CL250 is its high Withstanding Voltage capability of 5.55 kV AC for one minute. This provides an essential buffer against unexpected voltage spikes and transients, protecting both the meter’s internal circuitry and the user. The maximum measurement circuit voltage is specified at 1000 Vrms or less. Furthermore, its design accounts for environmental stability, capable of operating within a temperature range of 0 to 40°C and up to 85% Relative Humidity (RH) without condensation. This robust safety profile and stable performance under varying conditions cement the CL250’s status as a reliable and trusted tool for maintaining workplace safety during high-stakes electrical testing.

Exclusive Applications For High-Performance Industrial Electrical Testing

The advanced specifications of the Yokogawa CL250—particularly its 2000A AC/DC range, 55mm jaw capacity, and DC output—make it perfectly suited for several exclusive, high-performance industrial applications. Firstly, in Heavy Machinery and Motor Control Centers (MCCs), the CL250 is invaluable for measuring the high inrush current of large induction motors during startup (Peak Hold function) and monitoring their continuous operating currents, especially in systems utilizing variable frequency drives (VFDs). Secondly, in high-capacity DC power systems, such as those found in data centers, telecommunications facilities, and utility-scale battery storage, the CL250’s true DC capability and 2000A capacity are essential for checking busbar current flows, battery discharge rates, and verifying the load balance across massive DC banks. Thirdly, for analyzing Uninterruptible Power Supply (UPS) systems, the meter is utilized to measure the significant currents drawn during battery backup operations, ensuring the system can handle the required load. Fourthly, the DC Output feature is highly specialized for power quality recording; technicians can connect the CL250 to specialized loggers to capture long-term current profiles, facilitating advanced predictive maintenance and energy consumption studies that track trends over hours or days. Fifthly, in welding applications, the CL250’s high range is often used to quickly measure the high welding current from specialized power sources. These demanding scenarios confirm the CL250 is not just a general-purpose tool but a specialized asset for top-tier industrial diagnostics.

Exceptional Battery Life Combined With Complete Accessory Kit

The Yokogawa CL250 is designed for longevity and minimal field interruptions, especially concerning its power source and supporting accessories. The unit operates efficiently on two standard LR6 (AA) or R6P (SUM-3) batteries. A notable feature of the CL250 is its exceptional power efficiency; with a low consumed current of only approximately 9 mA, the meter boasts an extended battery life of approximately 100 hours of continuous operation. This outstanding endurance significantly reduces the frequency of battery changes, ensuring technicians can complete long diagnostic tasks without unexpected downtime. In terms of physical design, the CL250 maintains professional portability. With dimensions of approximately 105 (W) x 250 (H) x 49 (D) mm and a weight of only approximately 530 g (including batteries), it strikes an excellent balance between robust handling and field manageability. The purchase of the CL250 includes a comprehensive set of essential accessories designed to maximize its functionality and protection. The kit contains the necessary batteries, a durable carrying case (Model 93034) for safe storage and transport, high-quality test leads (Model 98011) for voltage and resistance measurements, and the specialized output plug (Model 98012) to facilitate the DC output feature connection. This thoughtful packaging ensures that the CL250 is a complete, ready-to-use professional testing solution right out of the box.