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TA8331A Digital Ground Resistance Tester

Name: TA8331A Digital Ground Resistance Tester
Brand: VINDAION
Price: 95.95 USD
Availability: InStock

$95.95 USD $191.78 USD Diskaun $95.83 USD

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I. Product Overview

The TASI TA8331A is a specialized digital instrument designed for measuring ground resistance and earth voltage, essential for ensuring the safety and effectiveness of lightning protection systems, electrical installations, and industrial grounding grids. Moving beyond traditional analog "shake tables," this device utilizes advanced digital circuitry to provide precise, stable readings. It supports both 2-wire and 3-wire measurement methods, making it versatile for various testing environments, from simple residential checks to complex industrial setups.

II. Key Features & Highlights

Precision Ground Resistance Measurement
- Selectable Ranges: Offers three specific resistance ranges to ensure high resolution across different applications: 20Ω, 200Ω, and 2000Ω.
- High Accuracy: Delivers reliable data with an accuracy of ±2% ± 0.1Ω in the 20Ω range, crucial for verifying low-resistance grounding connections required for effective lightning protection.
Earth Voltage Detection
- Includes a dedicated ACV (Earth Voltage) mode to measure interference voltage on the ground line (0~200V). This helps users identify potential noise issues or hazardous voltage potentials before performing resistance tests.
Robust Industrial Design
- Shock-Absorbing Protection: Encased in a durable, red soft-rubber protective sleeve that provides anti-vibration and drop resistance, protecting internal components during field operations.
- Backlit Display: Features a large LCD screen with a backlight function, ensuring clear visibility of readings in dim environments like basements, tunnels, or outdoor sites at night.
Flexible Power Options
- Dual Power Supply: Can be powered by 8x AA batteries for portable field use or connected to an external DC 12V power source for extended operation without battery anxiety.

III. Detailed Technical Specifications

表格

Parameter	Specification
Model	TA8331A
Measurement Method	2-Wire Method / 3-Wire Method
Resistance Ranges	20Ω (0.01-19.99Ω) 200Ω (0.1-199.9Ω) 2000Ω (1-1999Ω)
Accuracy	±2% + 0.1Ω (20Ω range) ±2% ± 3 digits (200Ω/2000Ω range)
Resolution	0.01Ω
Earth Voltage Range	AC 0 ~ 200V
Display	Digital LCD, Max reading 1999
Overload Protection	Displays "1" when out of range
Power Consumption	≤800mW (No-load)
Auto Power Off	Yes (Turns off after 10 minutes of inactivity)

IV. Measurement Principles & Usage

A. Ground Resistance Testing (3-Wire Method)

For the most accurate results, the device uses the fall-of-potential method.

Electrode Placement: Drive the auxiliary potential spike (P) and current spike (C) into the earth in a straight line, spaced 5 to 10 meters apart from the grounding electrode under test (E).
Connection: Connect the corresponding colored test leads from the instrument ports (E, P, C) to the respective spikes and the grounding point.
Principle: The instrument injects a current through the outer electrodes and measures the voltage drop across the inner electrodes to calculate resistance based on Ohm's Law ( $R = V / I$ ).

B. Earth Voltage Measurement

Setup: Connect the test leads to the ground object and a reference point.
Operation: Switch the dial to the EARTH VOLTAGE setting.
Safety Check: If the measured voltage exceeds 10V, it is recommended to disconnect the equipment being tested to reduce interference before measuring resistance, as high ground voltage can affect accuracy.

V. Package Contents

The standard kit is designed for immediate field deployment:

Main Unit: TA8331A Tester with protective rubber boot.
Test Leads: Green (5m), Red (15m), and Yellow (10m) wires with alligator clips.
Auxiliary Spikes: 2x Metal grounding steel stakes.
Power: 8x AA Batteries.
Accessories: Carrying bag, user manual, and certificate of conformity.