600A Contact Resistance Tester

Product Introduction

This instrument is designed in accordance with the latest power industry standard DL/T845.4-2004 of the People's Republic of China, integrating high-frequency switching power supply technology with digital circuit technology. It is suitable for measuring the loop resistance of switchgear control equipment. The test current employs the nationally recommended DC 100A and 200A. It directly measures loop resistance at 100A and 200A currents, displaying final results on a large LCD screen. Additional functions include data storage, print output, and time settings. Optional 400A and 600A ranges are available. This instrument delivers accurate measurements and stable performance, meeting the requirements for on-site high-voltage switch maintenance by power and supply departments, as well as loop resistance testing at high-voltage switch manufacturers.

Product Parameter (specification)

1. Measurement Range	Test Current DC100A;0 to 9999.0μΩ Test Current DC200A;0 to 6000.0μΩ Test Current DC400A;0 to 3000.0μΩ Test Current DC600A;0 to 2000.0μΩ
2. Resolution	0~99.99, 0.01μΩ;100.0~9999.0, 0.1μΩ
3. Test Current	Four fixed output levels;DC100A, 200A, 400A, 600A
4. Measurement Accuracy	±(0.2% of reading + 2d)
5. Continuous Operation Time	5s~599s
6. Display	Large-screen English LCD display
7. Communication	RS232 serial port or USB (optional)
8. Power Supply	AC220V±10% 50Hz
9. Total Power Consumption	>1000W
10. Maximum Storage Capacity	200 records
11. Operating Environment	Temperature -10°C to 40°C, Humidity ≤80% RH
12. Dimensions	313270235 mm³
13. Weight	8.9kg (excluding accessories)

Product feature and application

High Current: Utilizing the latest switching power supply technology, it delivers sustained high-current output over extended periods, overcoming the limitations of pulse-type power supplies with their transient current spikes. This effectively breaks through the oxide film on switch contacts, yielding reliable test results.
High Stability: Under severe interference conditions, the last digit on the LCD display remains stable within ±1 digit, ensuring reliable readings with excellent repeatability.
High Precision: Utilizing dual-channel high-speed 16-bit Σ-Δ AD sampling and the latest digital signal processing technology, it achieves a maximum resolution of 0.01μΩ. This is currently the only contact resistance tester in China capable of reaching 0.01μΩ resolution with exceptional stability, outperforming imported high-current micro-ohmmeters.
Intelligent Operation: Utilizes an imported high-performance CPU. During measurement, the system automatically switches ranges based on signal magnitude, ensuring testing accuracy. Over-temperature protection circuitry automatically halts current output when the instrument exceeds the set temperature, guaranteeing safe operation.
High Quality: All critical components are imported. A cleverly designed temperature compensation circuit effectively eliminates the impact of ambient temperature on measurement results. The use of military-grade connectors enhances vibration resistance.
Powerful Functionality: Current can be freely selected from 100A, 200A, 400A, or 600A. Test duration is freely adjustable between 5s and 599s, overcoming limitations of other instruments that lack adjustable measurement time or have excessively short continuous operation periods. This significantly outperforms comparable instruments.
User-Friendly Interface: Data input via rotary mouse enables quick and convenient operation. Users can independently set instrument date and time, save measurement data in real-time, and instantly print results.
Multiple Communication Methods: Supports communication with computers via RS232 serial port (9-pin) or USB cable to upload measurement data for further analysis and processing by test personnel.
Convenient Usage: Compact size and lightweight design ensure easy portability.

Prodection details

The instrument is suitable for high-precision measurement of high-voltage switch contact (circuit) resistance, and is equally applicable to other scenarios requiring high-current, micro-resistance measurement.

Company Qualifications

FAQ

1)What is the working principle of the MEHL-W600C Loop Resistance Tester?

Answer: This instrument employs the current-voltage method (four-wire method) testing principle. The current source outputs a constant current flowing through the standard resistor R₀ and the test resistor Rₓ. Voltage signals from both are sampled, filtered, amplified, and converted into digital values via AD conversion. The resistance value of the test resistor Rₓ is then calculated.

2) What key considerations should be observed when wiring the MEHL-W600C Loop Resistance Tester?

Answer: Two core points must be observed: First, ensure the connections between the instrument panel and test leads are securely tightened to prevent loosening. Second, strictly adhere to the four-terminal method for wiring. The current lead clamp must be attached to the outer side of the test specimen, while the voltage lead clamp is attached to the inner side. Furthermore, the polarity of the current and voltage leads must be maintained consistently.

3)How does the MEHL-W600C Loop Resistance Tester achieve data interaction with a computer?

Answer: First, install the drivers from the included CD (containing .NET environment, USB-to-serial driver, and supporting software). Then connect the instrument to the computer using an RS232 serial cable or USB data cable. Power on the instrument to enter the communication interface. On the computer, click "Communication Connection" in the supporting software. Once connected, functions such as data synchronization, report generation, and Excel export become available.

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