Resistance tester UHV-801

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The UHV-801 Ground Network Earth Resistance Tester is a frequency-conversion AC ground grid resistance meter with microprocessor control, designed for accurate measurement of grounding resistance, contact/step voltage and soil resistivity in live grids. It supports 50 Hz anti-interference capability and a 3 A test current for live-grid testing, reducing the need for traditional high-current setups and heavy cabling; suitable for substations, power plants and lightning protection systems.

Product Introduction

• Frequency-conversion AC measurement with microprocessor control for stable readings in energized grids.
• Measurement scope includes grounding resistance (approx. 4Ω–10Ω target range), contact/step voltage and soil resistivity.
• Designed for field use with compact form factor and reduced wiring compared with 30 A methods.

Key Features

• Precision power-frequency simulation — generates sinusoidal waveforms with ±5 Hz variation (45 Hz / 55 Hz) to emulate service frequency.
• Advanced anti-interference technology — variable-frequency measurement combined with digital filtering for stable results in noisy environments.
• High accuracy — 0.005 Ω basic error resolution for low-impedance grounding tests.
• Comprehensive measurement capabilities — tests current/voltage poles, grounding resistance, step voltage and contact voltage.
• User interface — intuitive Chinese menu navigation with direct measurement readouts.
• Field-oriented design — compact, lighter deployment avoiding heavy high-current lines.

Technical Advantages

• True power-frequency simulation (sinusoidal output).
• Superior noise rejection and digital filtering.
• Micro-ohm (0.001 Ω) resolution.
• Multi-parameter testing in a single instrument.
• Simplified workflow for faster field measurements.

Technical Specifications

• Measurement range: 0–200 Ω (including pile/current impedance)
• Resolution: 0.001 Ω
• Measurement error: ±(reading × 1% + 0.005 Ω)
• Maximum output voltage: AC 400 V (45 Hz, 55 Hz, dual-frequency, sine wave)
• Maximum output current: AC 5 A (45 Hz, 55 Hz, dual-frequency, sine wave); supports 3 A mode for live-grid testing
• Output current gears: 9 levels — 5 / 4.5 / 4 / 3.5 / 3 / 2.5 / 2 / 1.5 / 1 A (0.5 A steps)
• Anti-interference capability: withstands 50 Hz power-frequency interference up to 10 V
• Measurement line requirements: current lead copper-core section ≥ 1.5 mm²; voltage lead copper-core section ≥ 1.0 mm²
• Power supply: AC 220 V ±10%, 50 Hz
• External dimensions: 295 × 340 × 310 mm
• Instrument weight: 30 kg