Microtest 8740NAK Cable Tester (1024-Point, AC Kelvin)

The Microtest 8740NAK Cable Tester provides 1024-point connectivity and insulation testing with AC Kelvin low-resistance measurement from 1 mΩ to 52 Ω for high-density wire harness verification. The “NAK” designation combines the high test point density of the 8740 series with AC Kelvin measurement accuracy, using alternating current excitation and 4-wire sensing to deliver true conductor resistance readings that eliminate fixture contact resistance errors, thermal EMF offsets, and the measurement drift that affect conventional DC 2-wire resistance methods.

Specifications

Feature	Specification
Test Points	1024
Measurement Method	2-wire + AC Kelvin
Resistance Range	1 mΩ to 52 Ω
AC Hipot	Integrated withstand voltage
DC Hipot	Integrated withstand voltage
Insulation Resistance	Megohm-range measurement
Test Files	500 programmable recipes
Self-Learn	Automatic test file from reference sample
Recipe Selection	Barcode-driven
Interface	Handler, USB, barcode reader
Sorting	Pass/fail with disposition output

AC Kelvin Measurement Advantage

AC Kelvin measurement combines the accuracy benefits of 4-wire Kelvin sensing with AC excitation that eliminates thermal EMF errors inherent in DC resistance measurement. When testing low-resistance connections (crimp terminals, solder joints, welded contacts), thermoelectric voltages generated at dissimilar metal junctions can introduce millivolt-level offsets that corrupt DC resistance readings. The AC excitation technique rejects these DC offsets, providing stable and repeatable milliohm measurements even across temperature variations and worn fixture contacts. This is critical for production testing where measurement consistency across thousands of test cycles determines false failure rates.

Combined High-Density Testing

The 1024-point capacity with integrated hipot and insulation resistance testing covers complex harness assemblies, automotive body wiring, industrial control panel harnesses, telecom infrastructure cables, in a single fixture without splitting the harness across multiple test stations. The combination of low-resistance continuity verification, high-voltage insulation testing, and insulation resistance measurement provides complete electrical characterization of the harness in one test cycle. With 500 programmable test files and barcode-driven recipe selection, the 8740NAK supports mixed-model production lines.

Applications

Automotive harness manufacturers requiring milliohm-level crimp verification, aerospace cable assembly facilities with stringent conductor resistance specifications, medical device cable producers, and any application where low-resistance measurement accuracy is mandated by end-customer quality requirements deploy the 8740NAK. Indian harness manufacturers serving global automotive and aerospace OEMs benefit from the AC Kelvin accuracy that export quality specifications demand.

Watch the Microtest 8740NAK Cable Tester (1024-Point, AC Kelvin) on YouTube

GSAS Micro Systems delivers the Microtest 8740NAK to wire harness manufacturers and cable assembly production facilities across India with INR invoicing and application support. Engineering teams in Bengaluru, Hyderabad, Chennai, Pune, Mumbai, and Delhi NCR provide local demonstration, fixture design consultation, and after-sales service. Contact GSAS for detailed specifications and pricing.