ETCR3000 Digital Earth Resistance Meter Instruction Manual

1. Introduction

The ETCR3000 Digital Earth Resistance Meter is a precision instrument designed for measuring earth resistance and earth voltage. It utilizes digital and micro-processing technology to provide accurate and stable measurements using 2-wire or 3-wire methods. This manual provides essential information for the safe and effective operation of the device.

2. What's in the Box

The ETCR3000 Digital Earth Resistance Meter package includes the following components:

• Ground Resistance Meter (Main Unit)
• Instruction Manual
• Ground Pins (Earth Rods)
• Test Lines (Red, Green, Yellow)
• Simple Test Line (Red, Green)
• USB Communication Cable
• Power Adapter
• Software CD
• Tool Bag

Image 2.1: ETCR3000 Digital Earth Resistance Meter with included accessories and carrying bag.

Image 2.2: All components of the ETCR3000 Digital Earth Resistance Meter package, including the meter, test leads, ground pins, manual, and carrying bag.

3. Key Features

• Measurement Methods: Supports Precision 3-wire and Simple 2-wire measurement methods for earth resistance, and earth voltage measurement.
• Wire Resistance Verification: Unique function for wire resistance calibration, enhancing accuracy for low-value ground resistance measurements and preventing errors from test line changes or poor contacts.
• Anti-interference Capability: Designed with strong anti-interference capabilities for reliable measurements in various environments.
• Data Storage: Stores up to 400 sets of data for historical inquiry.
• Monitoring Software: Includes monitoring software for online real-time monitoring, dynamic display, max/min/average value indicators, alarm value settings, and data management (access, reading, preservation, reporting, printing).
• Display: Large LCD display with white backlight and bar graph indication for clear visibility.
• Applications: Suitable for measuring ground resistance in electric power systems, telecommunications, meteorology, oil fields, construction, lightning protection, and industrial electrical equipment.

4. Specifications

5. Setup and Connections

Before operating the ETCR3000, ensure all components are present and in good condition.

5.1. Battery Installation

The ETCR3000 is battery-powered. Refer to the manual for specific battery installation instructions. Ensure batteries are correctly oriented.

5.2. Connecting Test Leads

The meter supports both 2-wire and 3-wire measurement methods. The connection points are clearly labeled on the device.

Image 5.1: Front panel of the ETCR3000 meter, highlighting the display, function dial, and connection terminals (E, P(S), C(H)).

5.2.1. 3-Wire Measurement Method

This method is used for precise earth resistance measurements.

1. Connect the red test lead to the 'C(H)' terminal on the meter.
2. Connect the yellow test lead to the 'P(S)' terminal on the meter.
3. Connect the green test lead to the 'E' terminal on the meter.
4. Drive the C (Current) auxiliary earth electrode into the ground at a suitable distance from the earth electrode under test.
5. Drive the P (Potential) auxiliary earth electrode into the ground between the earth electrode under test and the C electrode.
6. Connect the red test lead to the C auxiliary earth electrode.
7. Connect the yellow test lead to the P auxiliary earth electrode.
8. Connect the green test lead to the earth electrode under test.

5.2.2. 2-Wire Measurement Method

This method is suitable for simpler measurements or when auxiliary electrodes cannot be used.

1. Connect the red test lead to the 'C(H)' terminal on the meter.
2. Connect the green test lead to the 'E' terminal on the meter.
3. Connect the red test lead to a known good ground (e.g., water pipe, building steel structure).
4. Connect the green test lead to the earth electrode under test.

6. Operating Instructions

6.1. Power On/Off

Rotate the function dial to any measurement range (e.g., 20Ω, 200Ω, 2000Ω for Earth Resistance or V_EARTH for Earth Voltage) to power on the device. Rotate to 'OFF' to power off.

6.2. Earth Resistance Measurement

1. Ensure test leads are connected according to the desired 2-wire or 3-wire method (refer to Section 5.2).
2. Rotate the function dial to the appropriate earth resistance range (20Ω, 200Ω, or 2000Ω). Start with the highest range if the resistance value is unknown.
3. Press the START button to initiate the measurement.
4. The measured earth resistance value will be displayed on the LCD.
5. If the reading is "OL" (Overload), switch to a higher range. If the reading is unstable, check connections or ground conditions.
6. To save the measurement, press the MEM button.

6.3. Earth Voltage Measurement

1. Connect the green test lead to the 'E' terminal and the red test lead to the 'P(S)' terminal.
2. Connect the green test lead to the earth electrode under test and the red test lead to a reference point (e.g., another earth electrode or neutral).
3. Rotate the function dial to 'V_EARTH'.
4. The earth voltage will be displayed on the LCD.
5. If the earth voltage is too high, it may affect earth resistance measurements. Address high voltage issues before proceeding with resistance tests.

6.4. Backlight and Data Management

• Press the LIGHT button to toggle the backlight on/off.
• Use the MEM button to access stored data.
• Use the AL button to set alarm values.
• Use the CLR button to clear data.
• The SET button is used for various settings and calibration. Refer to the detailed manual for advanced functions.

7. Maintenance

• Cleaning: Wipe the meter with a soft, dry cloth. Do not use abrasive cleaners or solvents.
• Storage: Store the device in its carrying bag in a cool, dry place away from direct sunlight and extreme temperatures.
• Battery Care: If the meter will not be used for an extended period, remove the batteries to prevent leakage.
• Calibration: Regular calibration by qualified personnel is recommended to ensure measurement accuracy.
• Inspection: Periodically inspect test leads and accessories for damage. Replace any worn or damaged parts immediately.

8. Troubleshooting

9. Safety Information

• Always read and understand the entire manual before operating the device.
• Do not use the meter if it appears damaged or is operating abnormally.
• Ensure all connections are secure before taking measurements.
• Avoid contact with live circuits during testing.
• Do not operate the meter in wet conditions or explosive atmospheres.
• Use only specified accessories and replacement parts.
• This device is intended for professional use. Users should have adequate knowledge of electrical safety procedures.

10. Warranty and Support

The ETCR3000 Digital Earth Resistance Meter comes with a standard manufacturer's warranty. For detailed warranty terms and conditions, please refer to the warranty card included with your product or contact ETCR customer support.

For technical assistance, troubleshooting, or service inquiries, please visit the official ETCR website or contact their authorized service centers.

Manufacturer: ETCR