Bending Endurance

Method 4.8.3 evaluates the bending endurance of completed shipboard cable. The test determines the cable’s ability to withstand repeated smooth and continuous reversing bending motion while subjected to a specified temperature.The specimen consists of a 30 +/- 6 inch length of completed cable. Specimen conductor ends are electrically interconnected such that a single series electrical […] Read more

Concentricity and Wall Thickness

Section 4.7.1 specifies the insulation concentricity requirements for shipboard cables. The insulation on individual conductors shall be uniform in diameter throughout the conductor length. Concentricity at any cross-section shall be not less than 85 percent for specified minimum average wall thickness greater than 0.025 inch, nor less than 75 percent for specified minimum average wall […] Read more

Cold Working (minus 54°C)

This test evaluates the performance of wire when exposed to low temperature conditions as specified in MIL-DTL-915. Specimens are conditioned at the specified low temperature, then subjected to mechanical stress (typically bending or impact) while still cold to evaluate cold-weather performance.Low temperature testing is critical for products used in aerospace, military, and outdoor applications where […] Read more

Cable Filler Removability

This test evaluates the cable filler removability of wire specimens as specified in MIL-DTL-915. The test is performed in accordance with the procedures defined in the standard to verify compliance with the applicable requirements.Test specimens are prepared and conditioned as specified, then subjected to the defined test procedure. Results are compared against the acceptance criteria […] Read more

Power Rating

Section 6.5.4 provides engineering information on the maximum power-handling capability (in watts) for continuous wave (CW) operation. This is the amount of power that a coaxial cable can safely transmit without overheating or developing a dielectric breakdown throughout the usable frequency range.The safe power-handling capabilities are shown on associated curves that have been derated with […] Read more

RF Transmission Loss (Attenuation)

The RF transmission loss (attenuation) test (Method 4.8.8) determines the signal attenuation characteristics of flexible and semirigid RF coaxial cables. For swept frequency testing, the cable specimen must be of sufficient length to exhibit no less than 1 dB loss at the low end of the frequency range, with the maximum length limited so that […] Read more

Temperature and Humidity (storage mode)

Method 4.4.5.3 is a temperature and humidity test in storage mode. The cable assembly in the packaged condition is subjected to a 28-day temperature/humidity test. The total test is made up of two 14-day temperature and humidity cycles.The term ‘chamber temperature’ refers to the temperature of the air immediately surrounding the equipment. Chamber temperature may […] Read more

Temperature and Humidity

Method 4.4.5.2 is a temperature and humidity test. A 20-foot length of completed cable is placed in a test chamber such that the exposed ends are not inside the chamber and are prepared for monitoring the electrical characteristics.The cable is subjected to a temperature of +122 degrees F for 2 hours. During this 2-hour period, […] Read more

Salt Water Immersion

Method 4.4.5.1 is a salt water immersion test. A length of completed cable is subjected to a 30-day immersion test. The cable is attached to a fixture so that the exposed ends will not be immersed in sea water.The cable is immersed for 16 hours and removed for a period of 8 hours. This sequence […] Read more

Cable Strength

Method 4.4.4.2 is a cable strength test. The cable is securely clamped at two points along its length, 15 inches apart. The equipment is oriented such that the axis of the 15-inch length of cable is in a horizontal plane.At a point midway between the clamps, a weight of 200 pounds is suspended from the […] Read more

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