Barfield 102-03120 – CT12A Digital Multi-Cable Tensiometer, 1/16" to 3/16" Diameter

The Barfield CT12A Digital Multi-Cable Tensiometer is designed to measure the tension of aircraft control cables with high accuracy. It supports multiple cable diameters, ranging from 1/16" to 3/16", making it suitable for a wide variety of general aviation and commercial aircraft applications. By providing precise tension measurements without requiring conversion tables, the CT12A enables technicians to maintain proper control-system performance, ensure flight safety, and comply with regulations. Its digital display and ergonomic one-handed operation make it ideal for both routine inspections and in-depth maintenance.

The CT12A Digital Multi-Cable Tensiometer is calibrated to NIST standards and includes a manufacturer-issued calibration certificate with every shipment. While it does not ship with ISO/IEC 17025-accredited calibration by default, Barfield’s OEM calibration ensures the instrument meets strict accuracy requirements for aircraft cable tension measurement. Operators that require ISO/IEC 17025 certification can obtain it through an accredited third-party calibration laboratory.

The Barfield 102-03120 configuration is a multi-cable model designed to measure tensions on cables with diameters ranging from 1/16" to 3/16". This includes the most common aircraft control cable sizes found in GA, business aviation, and regional aircraft. The tensiometer’s integrated cable gauge helps ensure operators select the correct diameter before performing a measurement. This versatility makes the 102-03120 an excellent choice for multi-aircraft fleets or maintenance shops.

The CT12A features a bright, four-character digital display that shows real-time tension readings, battery status, ambient temperature, and the last measured cable size. This eliminates guesswork commonly associated with analog tensiometers and reduces the chances of misreading values in low-light hangars. Digital output allows technicians to work more efficiently and reduces error rates during repetitive measurements.

The CT12A includes two measurement modes: Standard Mode and Averaging Mode. Standard Mode captures single, immediate tension readings for quick checks or adjustments. Averaging Mode automatically averages three consecutive measurements, helping smooth variations caused by cable vibration or operator movement. This dual-mode system supports both rapid troubleshooting and high-accuracy inspections.

Yes. The CT12A is engineered for one-handed operation, allowing technicians to clamp onto a cable and capture readings without the need for conversion charts or complex setup. Its ergonomic grip and three-button interface simplify operation even in tight or awkward spaces. This reduces fatigue during large inspection tasks and supports consistent, repeatable measurements across a maintenance program.

No. One of the CT12A’s main advantages is that it does not require conversion tables for interpreting cable tension. Once the operator selects the correct cable size, the unit automatically translates sensor data into an accurate tension reading. This feature significantly reduces measurement time and eliminates common errors associated with manual lookup tables.

According to the manufacturer, the CT12A has a 10-year useful lifespan when maintained and calibrated according to regular intervals. Its rugged housing, reinforced riser, and wear-resistant components allow it to withstand daily use in maintenance hangars and field environments. Proper storage and routine calibration help extend accuracy and operational reliability throughout its service life.

The CT12A operates using an internal rechargeable battery, eliminating the need for frequent battery replacements. The unit includes an automatic 10-minute shutoff feature to conserve battery life during busy maintenance operations. Operators can recharge the tensiometer via the included charging interface to ensure it remains ready for repeated use.

Yes. Weighing only 1.2 lbs (0.54 kg), the CT12A is designed to be both lightweight and portable. Its compact dimensions (8.75" × 4.38" × 1.5") make it easy to carry in a toolbox or take to remote flight-line locations. This portability is especially valuable for technicians supporting AOG situations or traveling between multiple aircraft.

The CT12A automatically displays the last selected cable size and the last measurement on its digital screen when powered on. This helps technicians quickly resume work in multi-step maintenance tasks without reconfiguring the unit. While it does not store long-term historical data, its design supports efficient sequential measurements during inspections.

Each CT12A multi-cable unit includes the tensiometer itself, a built-in cable gauge, a rechargeable battery, and the manufacturer’s calibration certificate. Depending on the distributor, it may also include a protective case, charger, and documentation for operating procedures and calibration intervals. The included hardware supports immediate use upon arrival, requiring no additional accessories for standard cable-tension measurement.

Calibration intervals typically follow the recommended cycle or organizational maintenance program standards established by the manufacturer or industry standards. Most operators calibrate their CT12A annually to ensure compliance with OEM and aviation regulatory requirements. Regular calibration ensures measurement accuracy, extends the lifespan of equipment, and supports traceability for internal quality assurance audits.

While the CT12A is primarily engineered for aircraft control-cable tension measurement, it can also be used on other steel cable systems within its supported diameter range. However, Barfield designs and calibrates the unit specifically to meet aviation-industry tolerances; therefore, users applying it outside the aviation industry should verify its suitability and accuracy for their specific application.

Yes. The 102-03120 model is a multi-cable version, but Barfield also manufactures several single-cable CT12A configurations tailored to individual cable diameters. Single-cable units are ideal for operators who routinely service a specific aircraft type, while multi-cable units offer greater flexibility for mixed fleets or MRO facilities working on diverse airframes.

Both are CT12A Digital Multi-Cable Tensiometers using identical electronics, display features, and measurement modes. The 102-03120 is calibrated for five cable sizes from 1/16" through 3/16". The 102-03108 extends that coverage to 1/4", adding the 7/32" and 1/4" cable sizes. Choose the 102-03120 when all cable sizes on the aircraft fall within 1/16"–3/16"; choose the 102-03108 when 7/32" or 1/4" cables are also in scope.

Averaging Mode causes the CT12A to automatically take three consecutive tension readings and display their average. This directly compensates for cable surface variation — the uneven surface of multi-strand cables causes small reading differences between positions on the same cable at the same tension. The T5 series service manual recommends manually taking three to five readings and averaging them for best accuracy; the CT12A's Averaging Mode performs that process automatically. Standard Mode remains available for single-point readings when speed is the priority.

No. Each Verification Bar is serial-matched to a specific CT12A instrument and must only be used with that unit. Using a non-matched Verification Bar produces unreliable accuracy verification results. The Verification Bar and the CT12A together form a single calibrated measurement system — they must always be used together and recertified together on the same annual cycle.

The 102-03120 is calibrated for standard multi-strand non-jacketed aircraft cables conforming to MIL-DTL-83420 Type I, Composition A — carbon steel with zinc or tin coatings. It is not appropriate for plastic-coated or jacketed Type II cables without a custom calibration performed by Barfield. Custom calibrations for other cable constructions are available from Barfield for an additional charge.

Both cover 1/16"–1/4" (the T5-2002-101-00 goes to 1/4"; the 102-03120 covers 1/16"–3/16"), but the measurement approach is fundamentally different. The T5-2002-101-00 is a mechanical dial instrument requiring riser selection and calibration chart conversion. The 102-03120 provides a direct digital readout with Averaging Mode, NIST-traceable documentation, and an integrated temperature display. The T5-2002-101-00 requires no battery and no annual calibration of a digital system; the 102-03120 requires annual recertification of both the instrument and Verification Bar at an approved facility. Both are appropriate for different program requirements — the CT12A for OEM-compliance and digital precision programs, the T5 for lower overhead mechanical measurement.