Extech 380460 Precision Four-Wire Milliohm Meter, 110 VAC, 60 Hz

Description

Product Overview

The Extech 380460 Precision Four-Wire Milliohm Meter is engineered for demanding electrical testing applications where accuracy and repeatability are paramount. Built around a robust four‑wire measurement technique, the instrument eliminates lead resistance errors, delivering true milliohm readings even on the smallest resistances. Its 110 VAC rating allows safe operation on standard power lines while maintaining high resolution across a broad range of resistance values. The meter features a large, backlit LCD that presents data in a clear, easy‑to‑read format, reducing the chance of misinterpretation in dimly lit environments. Constructed from a rugged ABS housing, the device meets the durability expectations of field technicians who frequently encounter drops, knocks, and exposure to dust or moisture. The included accessories—test leads, a protective case, and a battery compartment—ensure the meter is ready for immediate deployment. Technical specifications include a resistance resolution of 0.1 µΩ to 1 MΩ, a measurement accuracy of ±0.1 % of reading, and a temperature range of 0 °C to 50 °C for optimal performance. The Extech 380460 also incorporates data hold, relative mode, and auto‑range functions, simplifying complex measurement tasks and enhancing workflow efficiency.

Usage

Designed for a wide variety of industrial and commercial settings, the Extech 380460 excels in environments where low‑resistance measurement is critical. Electrical contractors use it to verify the integrity of motor windings, transformer coils, and cable terminations, ensuring that resistance values remain within specification before equipment commissioning. Maintenance engineers rely on the meter to troubleshoot grounding issues, detect loose connections, and assess the health of battery banks in backup power systems. In manufacturing plants, quality control teams employ the device to monitor the resistance of printed circuit board traces during production runs, catching defects early and reducing scrap rates. The meter’s portable form factor and battery‑operated design make it suitable for on‑site inspections, field service calls, and remote locations where mains power is unavailable. Its intuitive interface allows users with varying levels of expertise to quickly set up measurements, interpret results, and record data for reporting purposes. Whether you are calibrating precision instruments, performing routine preventive maintenance, or conducting detailed fault analysis, the Extech 380460 provides the confidence needed to make informed decisions.

Why Choose Us

Choosing the Extech 380460 means selecting a tool backed by decades of experience in test and measurement technology. Extech, a trusted brand within the COLE‑PARMER family, has a reputation for delivering reliable, high‑quality instruments that meet rigorous industry standards. The meter undergoes comprehensive factory calibration and is supplied with a calibration certificate, guaranteeing traceability to national standards. Our commitment to customer satisfaction extends beyond the point of sale; we provide responsive technical support, detailed user manuals, and access to online resources such as firmware updates and application notes. In addition, the product is covered by a limited warranty that protects against manufacturing defects, reinforcing our confidence in its long‑term performance. By investing in this meter, you benefit from a combination of precision engineering, durable construction, and a service network that ensures you can keep your equipment operating at peak efficiency. The Extech 380460 also offers future‑proof features like USB connectivity for data export, enabling seamless integration with modern asset management systems and facilitating trend analysis over time.

Key Features

• Four‑wire measurement eliminates lead resistance, delivering true milliohm accuracy for critical low‑resistance testing.
• Large backlit LCD provides clear visibility in bright or dim environments, reducing reading errors.
• Robust ABS housing withstands drops and harsh field conditions, ensuring long‑term durability.
• Auto‑range and data‑hold functions simplify complex measurements and improve workflow efficiency.
• Comprehensive technical support and warranty give peace of mind and protect your investment.

FAQ

What is the advantage of four‑wire measurement compared to two‑wire?

Four‑wire (Kelvin) measurement uses separate pairs of leads for current supply and voltage sensing, which removes the influence of lead resistance from the measurement. This results in more accurate readings, especially when measuring very low resistances where lead resistance would otherwise cause significant error.

Can the meter be used to measure resistance on live circuits?

The Extech 380460 is designed for low‑voltage, low‑current applications and should not be used on circuits that are energized above its rated 110 VAC limit. For safety, always disconnect power or use appropriate isolation techniques before measuring resistance.

How often should the meter be calibrated?

For most industrial applications, an annual calibration is recommended to maintain measurement accuracy. However, if the meter is subjected to harsh conditions or used for critical precision work, more frequent calibration may be advisable.

Is there a way to export measurement data for analysis?

Yes, the meter includes a USB interface that allows you to transfer recorded measurements to a computer. Data can be saved in common formats such as CSV, enabling easy import into spreadsheet software or specialized analysis tools.

What accessories are included with the Extech 380460?

The package contains a set of four‑wire test leads, a protective carrying case, a battery compartment with a rechargeable battery, and a quick‑start guide. Optional accessories such as additional lead sets and a magnetic base are available separately.