BENETECH GT5105A Digital Earth Resistance Tester Instruction Manual

1. Introduction

The BENETECH GT5105A is a high-accuracy and reliable digital earth resistance tester designed for measuring grounding resistance and ground voltage. It is controlled by an intelligent microcontroller chip, ensuring precise measurements for various power facilities wiring, electrical equipment, protection equipment, and other grounding devices. This manual provides detailed instructions for the safe and effective use of your GT5105A tester.

2. Safety Information

Please read and understand all safety warnings and operating instructions before using this instrument. Failure to follow these instructions may result in electric shock, fire, or serious injury.

• Always ensure the instrument is in good working condition before use.
• Do not exceed the specified maximum input values for any measurement range.
• The device features double insulation and a reinforced insulation safety structure for enhanced user protection.
• Avoid using the instrument in wet environments or during electrical storms.
• Ensure all test leads are securely connected before performing any measurements.
• If the "---Ω" warning appears, check the contact of the C or E test lead.
• "OL" indicates an over-range condition; select a higher range if available or ensure the measurement is within the device's capabilities.
• Replace batteries promptly when the low battery indicator appears to ensure accurate readings.

3. Package Contents

Verify that all items listed below are included in your package:

• 1 x BENETECH GT5105A Digital Earth Resistance Tester
• 1 x 5 Meters Green Test Lead (with alligator clip)
• 1 x 10 Meters Yellow Test Lead (with alligator clip)
• 1 x 20 Meters Red Test Lead (with alligator clip)
• 2 x Auxiliary Ground Nails
• 1 x Carrying Strap
• 1 x Cloth Bag
• 1 x Instruction Manual (English)

4. Product Overview

The GT5105A features a clear digital display and intuitive controls for ease of use. Below is a diagram identifying the main components and their functions.

1. LCD Display: Large digital screen for displaying measurement values, units, and status indicators.
2. Test Lead Connection Ports (E, P(S), C(H)): Terminals for connecting the test leads.
3. Save Key: Used to save the current measurement data.
4. Test Key: Initiates the measurement process.
5. Hold Key: Freezes the current reading on the display.
6. Function Selection Switch: Rotary switch to select measurement modes (Earth Voltage, Ground Resistance ranges) and power the device on/off.

Additional features include:

• Clear Large Screen: For easy reading of measurements.
• Battery Detection: Indicates battery status.
• Unit Conversion: Displays measurements in Volts (V) or Ohms (Ω).
• Overload Display ("OL"): Alerts when the measurement exceeds the selected range.
• Data Retention (HOLD): Allows freezing of displayed data.
• Data Storage: Capable of storing up to 20 sets of measurement data.
• Protective Cover Design: A robust cover protects the device when not in use.
• External Power Interface: Provides an option for external power supply.

5. Setup

5.1 Battery Installation

The GT5105A requires six 1.5V AA alkaline batteries (not included) for operation. To install or replace batteries:

1. Ensure the Function Selection Switch is in the "OFF" position.
2. Locate the battery compartment on the back of the device.
3. Open the battery compartment cover.
4. Insert six 1.5V AA alkaline batteries, observing the correct polarity (+/-) as indicated inside the compartment.
5. Close the battery compartment cover securely.

5.2 Connecting Test Leads

Connect the provided test leads to the appropriate ports (E, P(S), C(H)) on the tester. The leads are color-coded for easy identification:

• Green Test Lead (5 meters)
• Yellow Test Lead (10 meters)
• Red Test Lead (20 meters)

The auxiliary ground nails are used in conjunction with the test leads for earth resistance measurements.

6. Operating Instructions

6.1 Powering On/Off

Rotate the Function Selection Switch to any desired measurement range (e.g., 20Ω, 200V) to power on the device. To power off, rotate the switch to the "OFF" position.

6.2 Ground Voltage Measurement

To measure ground voltage:

1. Rotate the Function Selection Switch to the "EARTH VOLTAGE" position.
2. Connect the test leads to the appropriate points for voltage measurement.
3. The measured ground voltage will be displayed on the LCD.

6.3 Ground Resistance Measurement (Three-Wire Method)

For precise three-wire ground resistance measurement:

1. Connect the test leads and auxiliary ground nails according to standard three-wire earth resistance testing procedures.
2. Rotate the Function Selection Switch to the desired ground resistance range (20Ω, 200Ω, or 2000Ω).
3. Press the "TEST" key to initiate the measurement.
4. The ground resistance value will be displayed on the LCD.
5. If the reading shows "---Ω", check the connections of the C and E test leads for poor contact.
6. If "OL" is displayed, the resistance is out of range; select a higher range or verify the circuit.

6.4 Ground Resistance Measurement (Two-Wire Method)

For simple two-wire ground resistance measurement:

1. Connect the test leads for two-wire measurement.
2. Rotate the Function Selection Switch to the "2000Ω (2WIRES)" position.
3. Press the "TEST" key to initiate the measurement.
4. The ground resistance value will be displayed on the LCD.

6.5 Data Hold Function

To freeze the current reading on the display:

1. During a measurement, press the "HOLD" key. The "HOLD" symbol will appear on the LCD.
2. To release the hold and resume live readings, press the "HOLD" key again.

6.6 Data Storage and Review

The GT5105A can store up to 20 sets of measurement data.

1. After a measurement, press the "SAVE" key to store the value. If the memory is full, "FULL" will be indicated.
2. To review stored data, refer to the specific instructions in the full manual (not provided here).
3. Stored data can also be deleted as needed.

7. Maintenance

7.1 Cleaning

Wipe the instrument with a soft, dry cloth. Do not use abrasives or solvents. Ensure no moisture enters the device.

7.2 Battery Replacement

When the battery detection function indicates low power, replace all six AA batteries as described in Section 5.1.

7.3 Storage

When not in use for extended periods, store the GT5105A in a dry environment with temperatures between -20℃ and 60℃ and relative humidity below 70% (non-condensing). Remove batteries if storing for a long time to prevent leakage.

8. Troubleshooting

9. Specifications

Detailed technical specifications for the BENETECH GT5105A Digital Earth Resistance Tester:

Ground Resistance Measurement Ranges

Ground Voltage Measurement Range

10. User Tips

No specific user tips from reviews or Q&A were provided for this product. However, general best practices for using earth resistance testers include:

• Always ensure good contact between the auxiliary ground nails and the earth for accurate readings.
• When performing measurements, try to keep the test leads as straight as possible to minimize interference.
• Regularly check the condition of your test leads and alligator clips for wear and tear.
• For critical measurements, perform multiple readings and average the results to ensure consistency.

11. Warranty and Support

This product comes with a 1-year guarantee from the date of purchase. This warranty covers defects in materials and workmanship under normal use.

For technical support, troubleshooting assistance, or warranty claims, please contact your original point of purchase or the manufacturer's customer service. Please have your product model number (GT5105A) and purchase details ready when contacting support.