TASI TA862A Digital Ground Resistance Tester

Description

The TASI TA862A is an industrial-grade digital earth ground resistance tester engineered for rigorous field diagnostic evaluation of earthing grids, lightning protection infrastructure, and electrical distribution systems. Built with Original Engineering precision, the instrument employs both 2-pole simplified and 3-pole precision fall-of-potential measurement methodologies to assess earth ground impedance up to 4000 Ω alongside AC ground voltage analysis. Its constant-current inverter conversion architecture operates at an optimized 800 Hz frequency to reject commercial power-frequency harmonic noise, delivering accurate and repeatable readings across challenging industrial, utility, and telecommunications environments.

TECHNICAL SPECIFICATIONS
Measurement Topologies: 2-Pole Earth Resistance, 3-Pole Earth Resistance, Earth Voltage (AC)
Resistance Ranges: 0.00 Ω to 40.00 Ω / 40.0 Ω to 400.0 Ω / 400 Ω to 4000 Ω
Resistance Resolution: 0.01 Ω (0 to 40 Ω range) / 0.1 Ω (40 to 400 Ω range) / 1 Ω (400 to 4000 Ω range)
Resistance Accuracy: ±(2.0% of reading + 3 digits)
Earth Voltage Range: 0.0 V to 200.0 V AC (50 Hz / 60 Hz)
Earth Voltage Accuracy: ±(1.0% of reading + 5 digits)
Measurement Method: Constant current inverter (approx. 800 Hz, test current ≤ 3 mA)
Display Type: High-contrast backlit LCD with dual-value indicator and over-range OL alert
Sampling Rate: 2.0 readings per second
Safety Ratings: IEC 61010-1, CAT III 600V, CAT IV 300V, Pollution Degree 2
Terminal Input Protection: 300 V AC withstand across test terminals (E-P / E-C) for 1 minute
Data Functions: Real-time Data Hold, Auto Power Off, Low Battery Voltage Indicator
Power Source: 8 x 1.5 V AA (LR6) Alkaline Batteries
Operating Temperature: 0°C to +40°C
Operating Humidity: < 80% RH (non-condensing)
Storage Temperature: -10°C to +50°C
Storage Humidity: < 85% RH (non-condensing)
Enclosure Material: High-impact industrial ABS with integrated rubberized protective housing
Dimensions: 185 mm x 115 mm x 65 mm
Weight: 750 g (excluding accessories and batteries)

SYSTEM INTEGRATION AND TECHNICAL COMPATIBILITY
The TASI TA862A offers verified Technical Compatibility with standard industrial preventative maintenance, commissioning, and facility audit frameworks. The device integrates into standard testing routines mandated by IEEE 81 grounding standards, IEC 62305 lightning protection directives, and OSHA electrical safety protocols. For complete 3-wire fall-of-potential profiling, the unit utilizes dedicated color-coded leads (Red 20m, Yellow 10m, Green 5m) connected to auxiliary steel ground stakes. For indoor sub-panels and concrete-paved facilities where auxiliary probe placement is unfeasible, the instrument allows 2-wire reference measurement against low-impedance neutrals or metallic service piping. Standard procurement channels maintain minimal Lead Time for rapid field deployment and tooling standardization across multi-facility operations.

CRITICAL INDUSTRIAL APPLICATION
A primary application for the TASI TA862A is the commissioning and compliance testing of earthing networks within photovoltaic utility plants and telecommunication base transceiver stations (BTS). In these settings, high ground loop resistance caused by soil dry-out, thermal cycling, or galvanic corrosion of underground copper electrodes exposes sensitive electronics to catastrophic damage during transient lightning events. Operating on-site, the TA862A filters out residual 50/60 Hz industrial ground currents via its high-frequency test signal, enabling field technicians to accurately verify whether earth resistance meets the mandated threshold (typically < 5 Ω). This ensures proper fault-clearing paths for surge arresters, prevents step-potential hazards for personnel, and protects power inverters against devastating common-mode overvoltages.

Key Attributes
Accuracy Class: 0.01Ω/0.1Ω/1Ω/10Ω
Insulation Resistance: > 10 MΩ
Measuring Range: 0.01~29.99Ω/30~99.9Ω;/ 100Ω~999Ω/1KΩ~4KΩ
Testing Voltage: 2500V
Place of Origin: Jiangsu,China
Model Number: TA862A
Brand Name: TASI
Dimensions: 186*68*140mm
Display Type: Digital Only
Operating Temperature: 0~40℃
Speed Range: 0.1 m/s
Product name: Earth Resistance Tester
Model: TA862A
Measuring Method: 2-pole/3-pole method
Range: 0.01~29.99Ω/30~99.9Ω;/ 100Ω~999Ω/1KΩ~4KΩ
Resolution: 0.01Ω/0.1Ω/1Ω/10Ω
Data Storage: 100 Groups
Data hold: Yes
Power: 8*1.5V AA Batteries
Size: 186*68*140mm
Weight: Approx. 587g (battery nit included)

Packaging and Delivery
Selling Units: Single item
Single package size: 35X28X10 cm
Single gross weight: 2.320 kg