Twisted Pair Check

CAMI Develops Capability of Checking Twist Pair Relationships in Cables as Short as Six Feet.


July 11, 2018

Celebrating its 25th anniversary, CAMI Research Inc.  (Acton, MA), manufacturer of the CableEye® automation-ready cable and harness test system, has developed the capability of checking and measuring twist pair relationships in cables as short as six feet. This feature is now standard in the model M4 low voltage continuity tester, and available as an option for HiPot (HVX-series) testers. The same circuitry allows for measuring cable length, length to break, capacitance, and resistance with precision (4-wire).

Image of M4 continuity, resistance, capacitance tester overlaying results in netlist view. Annotation shows 2-wire and 4-wire resistance measurements are with 20mΩ resolution.
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A leader in the development of PC-based cable and wire harness, test systems, CAMI offers the CableEye suite of products complete with accessories – including plug-in connector boards. The stock library of these test fixture boards is constantly growing and is currently numbering over 60 – most of which are populated with families of connectors. When pre-populated boards are used, the tester GUI automatically displays a graphic of the connectors and wiring under test. The tester can be readily programmed to do the same for custom boards and fixtures. These boards are designed to fit all CableEye testers. Five boards in the CAMI library presently have Ethernet sockets where twisted pair cables may be used: CB1, CB15, and the CB18, CB18A, and CB18C.

With a single click, the wiring schematic can be switched to a customizable netlist view which can be set to display wiring colors (see photo). In both views, a large PASS/FAIL indicator is clearly visible. When checking twist pair relationships, a PASS indicator shows that the wire resistances comply with the threshold AND that the wires are paired correctly. If a capacitance value has been entered in the Match Data, then the values shown in the Test Data are within the capacitance tolerance set in the Tester tab.

Twist pair relationships can be checked in this way in cables as short as six feet. The same circuitry allows for measuring cable length longer than six feet, distances to break when six feet or more away, and polarized and unpolarized capacitors. Capacitance measurements acquired during the twist pair check on reels and cables are auto-saved and can be used to verify reel-to-reel and cable-to-cable consistency and quality. All connection measurements are logged for record-keeping and analysis.


All new testers ship with a renewable one-year warranty that includes free tech support and software upgrades.


Available immediately, this is now a standard feature in the model M4 low voltage continuity tester, and available as an option for HiPot testers (models HVX, HVX-21). Contact salesREMOVE@REMOVEcamiresearch.REMOVEcom or +1 (978) 266-2655 for a quote, or your local authorized distributor for local pricing. Check out CableEye at WNIE: Cimbian (Booth A52), and at Electronica: AllDaq (A3/655), Meilhaus (A3/107).

CAMI Research produces expandable and upgradable diagnostic Cable & Harness Test Systems for assembly, prototyping, production, and QC of standard or custom cables. CableEye Testers display, and document electrical properties such as continuity, resistance, capacitance, dielectric breakdown, insulation resistance, miswires, and intermittent defects.

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CableEye ® Automation-Ready Cable and Wire Harness Test Systems

CableEye testers are highly versatile, expandable and upgradable diagnostic and Pass/Fail check Cable and Harness Test Systems that are PC-based. They are used for assembly, prototyping, production, and QC of standard or custom wire cables and harnesses The entire suite of products is powered by the same easy-to-use operating software and, with the help of its signature easy-to-interpret color-coded graphics, instantly identifies not only when there is a fault, but what type of fault and where.

Low Voltage M2 Series
For diagnostic and Pass/Fail Testing - Find, display, log, & document continuity (opens, shorts, miswires, intermittent connections).

Low Voltage M3 Series
For all of the above plus resistance (contact, isolation, embedded), and diodes (orientation, forward voltage, reverse breakdown).

Low Voltage M4 Series
For all of the above plus precision resistance (4-wire), and capacitance (twist wire relationship, length of cable, length to break, capacitors).

Low Voltage and High Voltage HVX Series
For all as described for M3 plus HiPot (dielectric withstand voltage and insulation resistance). 4-Wire Kelvin Measurement and Advanced Measurement Options (capacitance, twist wire relationship, length of cable, length to break, capacitors) are available.

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Cable Assembly

photo credit: Progressive Image

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Cable Assembly

photo credit: AP Technology

"Our production guys find it simple to setup and use. Our clients love it as it provides complete traceability for each and every cable assembly we manufacture."

AP Technology, UK

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