(100A) Smart Loop Resistance Tester

Product Introduction

The electrical conductivity of a circuit breaker's (hereinafter referred to as switch) conductive circuit plays a crucial role in ensuring the safe operation of the switch. The quality of electrical conductivity can be reflected by the magnitude of the conductive circuit resistance. Therefore, IEC standards and manufacturers stipulate that circuit resistance must be measured, with explicit specified targets for circuit resistance across various switch types. Traditionally, the double-arm bridge method was employed. However, due to the bridge's relatively low voltage and current capabilities, test data dispersion increases significantly when contaminants or surface oxidation exist between the switch's moving and stationary contacts. Additionally, the bridge exhibits poor resistance to interference. Consequently, both GB50150-91 and DL/T596-1996 stipulate the use of the "direct current voltage method" with "current not less than 100 amperes." The ME-W2010E (100A) Intelligent Loop Resistance Tester, developed by our company to meet regulatory requirements, is widely applicable for measuring contact resistance, loop resistance of various electrical switches, as well as contact resistance of cables, wires, and welded joints.

Product Parameter (specification)

1. Test Current	50A, 100A
2. Measurement Range	50A Range;0 to 100 mΩ 100A Range;0 to 50 mΩ
3. Minimum Resolution	0.01μΩ
4. Accuracy	0.5% ± 0.2μΩ
5. Output Voltage	DC 10V
6. Operating Mode	100A, 50A continuous
7. Power Supply	AC 220V ±10%, 50Hz
8. Power consumption	≤1000W
9. Operating temperature	-20°C to 40°C
10. Relative humidity	≤80%, non-condensing
11. Weight	8.5kg
12. Dimensions	360mm × 235mm × 270mm

Product feature and application

1. High test current fully complies with national standards for contact resistance testing.

2. High output voltage with wide measurement range up to 100mΩ.

3. Test current sourced from a high-precision 100A switching constant-current power supply, eliminating manual adjustment for rapid and accurate testing.

4. Four-terminal wiring method effectively eliminates the influence of test lead resistance on results.

5. Fast testing speed with data displayed in approximately 3 seconds.

6. Supports extended continuous operation with built-in overheat protection circuit for reliable and stable performance.

7. Simple operation and lightweight design make it ideal for field applications.

8. Features a perpetual calendar and 99-group data storage with non-volatile memory. Equipped with a USB port for convenient data export to computers for spreadsheet generation.

9. Incorporates an RS485 communication interface for remote measurement control via host computer software.

Prodection details

Application Scenarios

This instrument strictly complies with GB50150-91, DL/T596-1996, and relevant IEC standards. Utilizing the 100A high-current DC voltage drop method as its core testing principle, it is suitable for precise resistance measurement in the following scenarios:

1. Power Systems:

Testing contact resistance and loop resistance of high-voltage electrical switches such as circuit breakers, disconnect switches, and load switches to ensure safe and stable operation of power equipment;

2. Electrical Manufacturing:

Factory acceptance testing of loop resistance for electrical equipment like high/low-voltage switchgear, distribution boxes, and bus ducts during production, as well as quality sampling inspections of finished products;

3. Cables & Welding:

Measurement of conductor resistance in cables and wires, contact resistance at joints, and detection of contact resistance at welds and copper/aluminum busbar connection points to identify connection hazards;

4. Operation & Maintenance:

Periodic inspections, fault troubleshooting, and post-repair loop resistance verification for electrical equipment in substations, power plants, industrial facilities, and mining operations;

5. Field Operations:

The instrument's lightweight portability and user-friendly operation meet resistance measurement needs in outdoor construction sites, remote power supply locations, and other environments without fixed testing infrastructure.

Company Qualifications

FAQ

1)Why can't the ME-W2010E (100A) Smart Loop Resistance Tester measure inductive circuits?

Answer: This instrument is designed for measuring resistance in purely resistive circuits. Its circuit structure and testing principle are tailored to the characteristics of purely resistive loads. Inductive circuits contain inductive components that generate electromagnetic induction. This not only interferes with the stability of the test current and the accuracy of the voltage signal but may also damage the instrument's internal circuitry due to the energy storage and release characteristics of inductors. Therefore, it is explicitly prohibited to measure inductive circuits.

2)What is the purpose of using the four-terminal connection method in the ME-W2010E (100A) Intelligent Loop Resistance Tester?

Answer: The core function of the four-terminal wiring method is to effectively eliminate interference from the test leads' own resistance on measurement results. This wiring method separates the current output circuit (I+, I-) from the voltage signal acquisition circuit (V+, V-). The resistance of the test leads is not included in the voltage signal acquisition range, ensuring that the measurement results reflect only the true resistance value of the test object and improving test accuracy.

3)Can the test leads be disconnected during testing with the ME-W2010E (100A) Intelligent Loop Resistance Tester? Why?

Answer: Test leads must not be disconnected during testing. Reasons are as follows: First, the instrument outputs a high current of 50A or 100A during testing. Disconnecting the leads at this time would cause an open circuit, generating a high-voltage arc that could burn the operator or damage the instrument. Second, sudden disconnection disrupts the stability of the test circuit, not only invalidating the test data but also potentially causing current surges that impact the instrument's internal circuitry, affecting its service life.

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