Overview
The Microtest 8761 Series Cable Tester is a professional electrical testing system designed for verifying cable assemblies, wire harnesses, and connector products. It provides reliable detection of wiring faults including open circuits, short circuits, miswiring, and intermittent connection problems during production testing.
The series includes multiple models such as 8761N, 8761NA, 8761FA, and 8761NAC, allowing manufacturers to select the appropriate configuration depending on their testing requirements. These testers combine precise 4-wire Kelvin resistance measurement with insulation testing and Hipot safety verification, making them suitable for both production quality control and laboratory analysis.
Because of these capabilities, the Microtest 8761 series is widely used by cable manufacturers, connector assembly plants, and electronics production facilities that require dependable electrical verification of cable products.
Comprehensive Cable Testing Functions
The Microtest 8761 series supports a wide range of electrical tests used in cable assembly verification and connector testing.
- Open circuit detection
- Short circuit detection
- Miswire detection
- Intermittent connection testing
- Continuity testing
- Conductance resistance measurement
- Component testing including resistance, capacitance, and diode checks
- Insulation resistance measurement
- AC and DC Hipot testing depending on model
These testing functions allow manufacturers to ensure electrical reliability and correct wiring in complex cable assemblies and connector systems.
High Precision 4-Wire Measurement
The 8761 Series uses 4-wire Kelvin measurement technology to achieve high accuracy in low resistance measurements. This approach eliminates errors caused by lead resistance and ensures precise conductance measurement even in very low resistance cable paths.
- Conductance resistance range down to 1 mΩ
- Accurate measurement of cable resistance
- Improved reliability for low resistance connections
- Suitable for high precision harness testing
This capability is especially important for verifying power cables, automotive wiring harnesses, and other low-resistance cable assemblies.
USB Type-C Cable Testing with 8761NAC
The Microtest 8761NAC model is designed specifically for testing modern USB Type-C cables. USB Type-C cables contain multiple signal paths and complex pin configurations, requiring dedicated testing solutions to verify proper electrical connectivity.
- Dedicated testing for USB Type-C cable assemblies
- Verification of complex connector pin assignments
- Detection of open circuits, shorts, and miswiring
- Suitable for consumer electronics cable production
This makes the 8761NAC particularly useful for manufacturers producing smartphone, laptop, and consumer electronics cables.
Automation and System Integration
The Microtest 8761 series is designed for integration with automated production testing systems. Multiple communication interfaces allow the tester to be connected with PLC systems, computers, and automated cable testing platforms.
- LAN interface
- USB Host
- USB Device
- RS-232 interface
- Handler interface
With these interfaces, the tester can be easily deployed in automated cable testing stations and production line quality inspection systems.
Typical Applications
- Wire harness testing
- Cable assembly manufacturing
- Connector testing
- USB cable production testing
- Automotive wiring harness verification
- Consumer electronics cable inspection
- Production line quality control

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