The ETCR EM3690 handheld loop resistance tester, also known as a contact resistance tester, utilizes microprocessor technology and a precise four-wire method for reliable and accurate testing. It is designed for measuring low-level resistances in 

high-voltage switches, circuit breakers, relay metal contacts, and other applications. Compact and lightweight, it features a high-capacity lithium-ion battery pack, enabling 500 measurements on a single charge. It is particularly suitable for 

outdoor construction sites and is widely used in power generation, transmission, and substations, construction quality inspection stations, supervision companies, construction units, lightning protection companies, power departments, 

shipbuilding and locomotive factories, and other industrial and mining enterprises.

The ETCR EM3690 handheld loop resistance tester is ergonomically designed for a comfortable grip. Its specially designed housing is insulated, sealed, and provides protection against leakage, wind and sand, and shock absorption. 

The high-brightness 5-inch touchscreen color display offers easy operation and quick function access. The display is clear and bright, with both Chinese and English text. The instrument offers multiple test current settings, displays the current range, 

and allows users to select the current setting and test time to meet diverse application requirements.

The ETCR EM3690 handheld loop resistance tester consists of a main unit, monitoring software, test leads, power adapter, and USB communication cable. The meter can store 1,000 test data sets. Users can access data records via Bluetooth or 

upload them to a computer via a USB port and host software for historical data reading, review, and storage.

Product Features

1. 5-inch color touchscreen display, large-capacity lithium battery, and handheld design for portability and ease of operation.

2. Maximum test current of 100A, compliant with the "DL/T845.4-2004" power standard of the People's Republic of China.

3. Highly resistant to power frequency interference, suitable for use in 1000kV substations.

4. High test accuracy of 0.5%, a wide range of 0.0uΩ to 10.000mΩ, and a high resolution of 0.1uΩ.

5. Multiple test current and time settings are selectable to meet user needs in various applications.

6. The housing is insulated and sealed, providing protection against electrical leakage, wind and sand, and shock.

7. Overheat protection: Testing stops when the internal temperature is too high.

8. Automatic shutdown: The device automatically shuts down after 15 minutes of inactivity.

9. It can store 1,000 sets of data, ensuring data protection during power outages.

10. Bluetooth communication allows communication with mobile devices.

11. A USB port and host software are included for communication with a computer.

1. Measurement Range and Accuracy

2. General specifications