The UNI-T UT251C+ is a high-accuracy true RMS leakage current clamp meter with exceptional measurement sensitivity down to 1µA resolution. Engineered specifically for testing AC leakage current in electrical systems, its large 40mm jaw opening and strong anti-interference capabilities ensure reliable performance even in electrically noisy environments. With advanced features like harmonic measurement, Bluetooth connectivity, and LPF filtering technology, this professional-grade meter delivers the precision and reliability needed by maintenance technicians, electrical safety inspectors, and field service personnel in commercial buildings, industrial facilities, data centers, and residential applications.
The UNI-T UT251C+ delivers exceptional measurement accuracy with its high-resolution design, providing the precision needed for detailed leakage current diagnostics. With current measurement accuracy of ±(1%+5) for 45Hz~60Hz frequency range and resolution down to 1µA, it offers the sensitivity required for detecting even the smallest leakage currents. The True RMS measurement capabilities ensure accurate readings regardless of waveform distortion, while the specialized LPF (Low Pass Filter) function eliminates high-frequency interference for stable and reliable measurements.
The advanced harmonic analysis capability identifies and quantifies harmonic components up to the 20th order, allowing technicians to evaluate power quality issues and troubleshoot complex electrical problems. This feature is particularly valuable when diagnosing equipment malfunctions caused by harmonic distortion or when verifying compliance with power quality standards.
The UT251C+ combines essential leakage current measurements with specialized functions to deliver complete diagnostic capabilities:
These comprehensive measurement capabilities make the UT251C+ the ideal tool for professionals who need reliable leakage current detection and analysis in a single instrument.
The integrated Bluetooth connectivity pairs with the UNI-T Smart Measure mobile application (available for both iOS and Android), allowing technicians to:
This connectivity transforms the UT251C+ from a simple measurement tool into a complete diagnostic system, enabling technicians to document system performance, share findings with team members, and maintain comprehensive maintenance records.
Safety engineers and inspectors rely on the UT251C+'s high sensitivity and precision for:
Maintenance technicians leverage the UT251C+'s specialized features for:
HVAC technicians depend on the UT251C+'s sensitivity and measurement range for:
IT and facility technicians utilize the UT251C+ for:
| Measurement | Range | Accuracy |
|---|---|---|
| AC Current | 3.000mA (1µA resolution) | 45Hz~60Hz: ±(1%+5) 60Hz~1.2KHz: ±(2%+10) |
| AC Current | 30.00mA (0.01mA resolution) | |
| AC Current | 300.0mA (0.1mA resolution) | 45Hz~60Hz: ±(1%+5) 60Hz~1.2KHz: ±(2%+10) |
| AC Current | 3.000A (0.001A resolution) | |
| AC Current | 30.00A (0.01A resolution) | 45Hz~60Hz: ±(1%+5) 60Hz~1.2KHz: ±(2%+10) |
| AC Current | 60.0A (0.1A resolution) | |
| Frequency | 99.99Hz (0.01Hz resolution) | ±(0.1%+5) |
| Frequency | 999.9Hz (0.1Hz resolution) | |
| Frequency | 5.000KHz (0.001KHz resolution) | |
| Harmonic (1) | Fundamental | ±(3%+10) |
| Harmonic (2~6) | 2nd through 6th order | ±(3.5%+10) |
| Harmonic (7~8) | 7th through 8th order | ±(4.5%+10) |
| Harmonic (9~10) | 9th through 10th order | ±(5%+10) |
| Harmonic (11~15) | 11th through 15th order | ±(7%+10) |
| Harmonic (16~20) | 16th through 20th order | ±(10%+10) |
| Feature | UNI-T UT251C+ | Standard Clamp Meters | Precision Leakage Testers |
|---|---|---|---|
| Resolution | 1µA (0.001mA) | 10mA (0.01A) | 1µA (0.001mA) |
| Jaw Size | 40mm | 30-35mm | 35mm |
| Harmonic Analysis | Yes (up to 20th order) | No | Limited |
| Anti-Interference | Strong with LPF | Minimal | Moderate |
| Bluetooth | Yes | Rarely | Premium models only |
| Current Range | 3mA - 60A | 0.1A - 600A+ | 0.1mA - 30A |
| Weight | 350g | 400-500g | 400g+ |
| Price Point | Mid-range | Lower | Premium |
What is a leakage current clamp meter and how does it differ from standard clamp meters?
A leakage current clamp meter like the UT251C+ is specifically designed to measure very small currents (in the milliamp or even microamp range) that "leak" from electrical circuits to ground or between conductors. While standard clamp meters typically measure load currents (amps drawn by operating equipment), leakage clamp meters feature significantly higher sensitivity and resolution, specialized filtering to eliminate interference, and design optimizations to detect currents as small as 1µA. The UT251C+ offers 1000 times more sensitivity than typical clamp meters, allowing for precise measurement of currents that could indicate insulation failures, ground faults, or potential safety hazards before they become critical problems.
How does the LPF (Low Pass Filter) function improve measurement accuracy?
The UT251C+'s Low Pass Filter function significantly improves measurement accuracy by eliminating high-frequency noise and interference that can affect leakage current readings. In modern electrical environments with variable frequency drives, switching power supplies, and electronic equipment, high-frequency components can cause false readings on standard instruments. The LPF function filters out these high-frequency signals, allowing the meter to capture only the true leakage current at the power frequency (typically 50/60Hz). This ensures that readings represent actual leakage conditions rather than electromagnetic interference, enabling technicians to make accurate assessments of insulation health and electrical safety.
Why is harmonic measurement important for leakage current analysis?
Harmonic measurement is crucial for comprehensive leakage current analysis because modern electronic equipment often generates non-sinusoidal currents with significant harmonic content. The UT251C+'s ability to analyze harmonics up to the 20th order allows technicians to identify not just the magnitude of leakage current, but also its frequency composition. Different harmonic patterns can help diagnose specific issues - for example, 3rd harmonic dominance might indicate neutral conductor problems, while higher harmonics could point to switching power supply issues. Understanding the harmonic profile of leakage currents helps technicians pinpoint the source of problems, differentiate between normal operational leakage and developing faults, and implement targeted corrective measures.
How does the Bluetooth connectivity enhance the UT251C+'s capabilities?
The UT251C+'s Bluetooth connectivity transforms the meter from a simple measurement tool into a complete diagnostic system by connecting with the UNI-T Smart Measure application. This connection enables technicians to record measurement data over time, creating trend analysis that reveals intermittent issues or progressive insulation degradation that single readings might miss. The ability to generate professional reports with measurement data and system information streamlines documentation for compliance records, maintenance history, and team collaboration. Additionally, the remote monitoring capability allows technicians to position the meter in difficult-to-access locations while viewing readings from a safe distance, enhancing both safety and efficiency during testing.
What is the warranty period for the UNI-T UT251C+?
UNI-T provides a 1-year warranty on the UT251C+, covering manufacturing defects and component failures under normal use conditions. This standard warranty ensures your investment in professional measurement equipment is protected, giving you confidence in your purchase decision.
UNI-T stands behind the UT251C+ with comprehensive technical support and a 1-year warranty. Our dedicated support team is available to assist with application questions, measurement techniques, and warranty service.
The UNI-T UT251C+ Leakage Current Clamp Meter delivers exceptional sensitivity, accuracy, and specialized features for demanding electrical safety and maintenance applications. With its 3000-count display, 40mm jaw opening, and industry-leading 1µA resolution, it provides reliable performance for maintenance professionals who need to detect, measure, and analyze leakage currents in today's complex electrical systems.
Order Your UNI-T UT251C+ Today and Experience Professional-Grade Leakage Current Measurement Capabilities
