Yokogawa CL155 Clamp-on Meter Tester

Description

Yokogawa CL155 Clamp-on Meter Tester

Delivering True RMS High Capacity Current Measurement Easily

The Yokogawa CL155 Digital Clamp Meter is engineered to meet the demanding requirements of modern electrical professionals, offering superior accuracy in AC current measurement. At its core, the CL155 features an impressive current range capability, extending up to 2000A AC. This high capacity is complemented by its True RMS detection method, which ensures highly accurate readings even when dealing with complex, non-sinusoidal waveforms commonly found in variable frequency drives, switching power supplies, and other non-linear loads. This accuracy is crucial for precise load analysis, system balancing, and reliable troubleshooting. In addition to its primary current sensing function, the CL155 provides essential measurements including AC/DC voltage and resistance. This versatility reduces the need for multiple instruments, streamlining field operations. A significant physical attribute is its substantial jaw opening, capable of accommodating conductors with a diameter of up to 54mm. This broad aperture ensures compatibility with the heavy gauge wiring prevalent in industrial plants, substations, and large commercial buildings, making the CL150 a practical and adaptable tool. The CL155 embodies Yokogawa’s dedication to providing instruments that blend high performance with practical usability, suitable for the most challenging environments. Its True RMS capability is a critical differentiator, offering a significant leap in measurement fidelity over average-detecting clamp meters.

Precision True RMS Readings and Reliable Display

Accuracy and readability are paramount in electrical diagnostics, and the Yokogawa CL155 excels in both. It features a clear digital LCD display capable of showing up to 3999 counts, providing the resolution needed for detailed readings. The adoption of the True RMS detection method is a key advantage, delivering accurate measurements of the effective (RMS) value of AC current and voltage, regardless of waveform distortion. For AC current measurements up to 400A (Reference), the accuracy is 1.0% reading + 3 digits (at 50/60Hz), and 2.0% reading + 3 digits (from 40Hz to 1kHz). At its maximum 2000A range (0-1500A), the accuracy is 2.0% reading + 3 digits (50/60Hz), extending to 3.0% reading + 3 digits (from 40Hz to 1kHz). AC voltage accuracy is 1.0% reading + 2 digits for the 40/400V ranges and 1.5% reading + 3 digits for the 750V range (at 50/60Hz). Resistance measurements are accurate to 1.5% reading + 2 digits, with an integrated continuity check that beeps below 50±35Ω. The response time is swift, approximately 2 seconds, ensuring efficient workflow. The clarity of the True RMS display provides confidence in critical measurements, vital for safety and operational integrity. These specifications underscore the CL155’s reliability for demanding professional applications where waveform accuracy is essential.

Comprehensive Voltage, Resistance, and Output Functions

The Yokogawa CL155 is far more than just a clamp meter; it is a comprehensive diagnostic tool. In addition to its high-capacity AC current measurement, it accurately measures AC and DC voltages across several ranges: 40V/400V/750V AC and 40V/400V/1000V DC. The DC voltage accuracy is a solid 1.0% reading + 2 digits. Resistance measurements are supported up to 400kΩ, complete with a continuity function that audibly alerts the user to low-resistance paths, invaluable for quick circuit checks. A standout feature is the DC output function, which generates a voltage proportional to the measured AC current (e.g., 0-400mV Reference for 400A measurement), with an output accuracy of ±0.5% rdg ± 0.5mV. This analog output is exceptionally useful for interfacing with external data loggers or chart recorders, allowing for continuous monitoring and analysis of current trends over time. This integration of multiple measurement types—True RMS current, AC/DC voltage, resistance, continuity, and analog output—makes the CL155 a highly adaptable instrument for a wide spectrum of electrical tasks, from basic checks to in-depth system analysis. The inclusion of a 1000V DC range is particularly relevant for systems employing DC power or high-voltage DC components.

Safety Conformance and Robust Environmental Resilience

The design of the Yokogawa CL155 places a paramount emphasis on user safety and operational reliability in challenging environments. It is rigorously approved for conformity to international safety standards including EN 61010-1, EN 61010-2-031, and EN 61010-2-032. These certifications classify the meter for use in circuits up to 600V CAT. III and 1000V CAT. II, providing a broad safety envelope for measurements in distribution systems and general building wiring. A critical safety feature is its high withstanding voltage capability of 5.55kV AC for one minute, protecting the user and the instrument from transient overvoltages. The CL155 is built to perform reliably across a practical operating temperature range of 0-40°C and up to 85% relative humidity (non-condensing). Yokogawa has also engineered the CL155 to minimize external influences: the impact of external magnetic fields is limited to 1A or less at 400A/m, and the effect of conductor positioning is kept within ± (2.0% rdg + 3dgt). This robust design ensures that measurements remain accurate and the user is protected, even when working in demanding industrial settings. These safety and environmental specifications confirm the CL155 as a dependable and secure choice for professionals.

Specialized Applications in Industrial Diagnostics and Maintenance

The Yokogawa CL155, with its True RMS capability and high current range, is exceptionally suited for specialized industrial applications. First, it is indispensable for troubleshooting variable frequency drives (VFDs) and motor control centers (MCCs). The True RMS measurement is vital here to accurately gauge current consumption under the distorted waveforms produced by VFDs, ensuring motors operate efficiently and safely. Second, it is routinely used in power quality analysis and diagnostics. By accurately measuring current in systems with harmonic distortion, the CL155 helps identify potential issues related to overheating or inefficient power utilization. Third, for commissioning new industrial equipment, it provides reliable current readings on high-capacity feeders and machinery, confirming correct installation and initial operation before full load. Fourth, in utility and power distribution settings, the CL155 is used for load balancing checks on transformers and feeders, especially where non-linear loads are present. Fifth, its analog output function allows for integration into data acquisition systems for long-term load monitoring, providing valuable insights into energy usage patterns and predictive maintenance needs. These specific applications highlight how the CL155’s advanced features directly address complex industrial measurement challenges.

User-Centric Features for Enhanced Workflow Efficiency

The Yokogawa CL155 integrates user-friendly features designed to maximize efficiency and data accuracy in the field. The Data Hold function, available on all measurement ranges, allows users to freeze a reading on the display, facilitating notes or observations without the need to keep the clamp on the conductor. For energy conservation, an automatic Sleep Function powers down the meter approximately 10 minutes after the last operational input, significantly extending battery life. Power is supplied by two R6P (SUM-3) or LR6 batteries, providing a substantial typical battery life of 150 hours under normal operating conditions (approx. 5mA consumed current), ensuring the meter is ready when needed. Range selection is intelligently managed: Manual-range selection is used for AC current for precise control, while Auto-ranging is employed for AC voltage and resistance measurements, simplifying setup and speed of operation. The meter’s dimensions (approx. 105(W) x 247(H) x 49(D)mm) and weight (approx. 470g) contribute to comfortable handling and portability, reducing user fatigue during extended work sessions. These thoughtful design elements collectively enhance the practicality and effectiveness of the CL155 for daily professional use.