A. Product Overview

The Metrix Plus DET 1503 is a digital earth resistance tester designed to verify the resistance of electrical grounding systems.

An effective earthing system provides a path through which electrical fault current can flow safely into the ground. Measuring earth resistance helps technicians evaluate whether the grounding arrangement is functioning as required.

The DET 1503 provides three earth resistance measurement ranges:

• 0 to 20 ohms
• 0 to 200 ohms
• 0 to 2000 ohms

It can also measure earth voltage from 0 to 200V. 

Key Features

• Digital earth resistance measurement
• 20 ohm, 200 ohm and 2000 ohm measurement ranges
• Earth voltage measurement up to 200V
• Manual range selection
• Large backlit LCD display
• Timer measurement function
• Data hold function
• Low battery indication
• Battery operated portable design
• Supplied with earth spikes and test accessories
• Suitable for grounding system verification and maintenance

The instrument is designed for electrical engineers and technicians who need a portable solution for routine earthing system testing.

B. Working Principle

The Metrix Plus DET 1503 primarily works using the fall of potential method for earth resistance measurement.

During this type of testing, the earth electrode being tested and auxiliary earth spikes are positioned according to the required test procedure.

The tester sends a known electrical test current through the grounding system and auxiliary electrode.

Another auxiliary electrode is used to measure the resulting voltage difference.

The instrument then calculates earth resistance using the relationship:

Resistance = Voltage divided by Current

The displayed resistance value helps the technician evaluate the condition of the grounding system.

Basic Earth Resistance Testing Process

1. Identify the earth electrode to be tested.

2. Position the auxiliary earth spikes according to the required measurement procedure.

3. Connect the test wires between the tester, earth electrode and auxiliary spikes.

4. Select the appropriate earth resistance range.

5. Start the measurement.

6. Allow the tester to determine the resistance.

7. Read the measured earth resistance from the display.

8. Compare the result with the applicable installation or maintenance requirements.

The DET 1503 has an approximate earth resistance response time of 5 seconds, while earth voltage measurement takes approximately 2 seconds. 

C. Why Is the Metrix Plus DET 1503 Used?

1. Earth Resistance Measurement

The primary purpose of the DET 1503 is to measure resistance between an electrical grounding system and earth.

2. Grounding System Verification

Electrical installations depend on effective grounding for safety. Earth resistance testing helps technicians check the performance of the grounding electrode system.

3. Electrical Installation Testing

The tester can be used while installing or commissioning electrical grounding systems.

4. Preventive Maintenance

Earth resistance can change over time because of environmental conditions, soil characteristics, corrosion and deterioration of grounding connections.

Periodic testing helps maintenance teams monitor grounding system performance.

5. Substation Earthing Testing

The DET 1503 can be used during grounding system testing in transformer stations and electrical distribution installations.

6. Power Distribution System Testing

Grounding systems associated with power distribution lines and electrical circuits can be checked using an earth resistance tester.

7. Building Earthing Inspection

Commercial, residential and industrial buildings require suitable electrical grounding. The DET 1503 can be used during inspection and maintenance of these earthing systems.

8. Electrical Equipment Grounding Checks

Grounding arrangements associated with electrical equipment and installations can be verified as part of routine electrical maintenance.

9. Earth Voltage Measurement

In addition to earth resistance, the DET 1503 can measure earth voltage up to 200V, providing another useful parameter during grounding system inspection. 

D. Suitable Buyers

The Metrix Plus DET 1503 Digital Earth Resistance Tester is suitable for:

• Electrical engineers
• Electricians
• Electrical contractors
• Electrical maintenance technicians
• Industrial maintenance departments
• Power distribution companies
• Transformer station maintenance teams
• Substation maintenance engineers
• Electrical testing companies
• Electrical panel contractors
• Facility management companies
• Manufacturing plants
• Infrastructure contractors
• Building maintenance teams
• Electrical commissioning engineers
• Solar installation companies
• Industrial electrical contractors
• Preventive maintenance companies
• Engineering service providers
• Electrical testing laboratories

It is particularly useful for professionals responsible for grounding system testing, electrical safety inspections, commissioning and preventive maintenance.

Frequently Asked Questions

1. What is the Metrix Plus DET 1503?

The Metrix Plus DET 1503 is a digital earth resistance tester designed to measure the resistance of electrical grounding and earthing systems.

2. What is the earth resistance range of the DET 1503?

The DET 1503 provides three measurement ranges:

• 0 to 20 ohms
• 0 to 200 ohms
• 0 to 2000 ohms 

3. What is the maximum earth resistance measurement?

The maximum specified earth resistance measurement range is 2000 ohms.

4. Can the DET 1503 measure earth voltage?

Yes. It can measure earth voltage from 0 to 200V. 

5. What is an earth resistance tester used for?

An earth resistance tester is used to evaluate the resistance of an electrical grounding system to earth. This helps technicians verify grounding performance during installation, maintenance and inspection.

6. What is the resolution of the DET 1503?

The specified earth resistance resolution depends on the selected range:

• 20 ohm range: 0.01 ohm
• 200 ohm range: 0.1 ohm
• 2000 ohm range: 1 ohm

Earth voltage resolution is 0.1V. 

7. Does the DET 1503 have a backlit display?

Yes. It features a large backlit display, making readings easier to view during field testing. 

8. Does the DET 1503 have a data hold function?

Yes. The tester includes a data hold function that allows the displayed reading to be retained for convenient viewing.

9. Does the DET 1503 have a timer function?

Yes. Timer measurement is one of the key features of the DET 1503.

10. Is the DET 1503 manual ranging or auto ranging?

The DET 1503 uses manual range selection. 

11. What is the earth resistance response time?

The specified response time for earth resistance measurement is approximately 5 seconds.

12. What is the earth voltage response time?

Earth voltage measurement takes approximately 2 seconds. 

13. Can the DET 1503 be used for building earthing testing?

Yes. Building grounding systems are among the applications for which an earth resistance tester can be used.

14. Can it be used for transformer station earthing?

Yes. The manufacturer lists transformer stations among the intended application areas for this tester. 

15. Can the DET 1503 be used for power distribution systems?

Yes. The tester is suitable for grounding resistance measurements associated with power distribution systems and electrical installations.