Insulation Construction
In this evaluation, the insulation construction of a wire sample is validated by a visual examination at 2x magnification. Read more
Archives
Stiffness and Springback
This test is used to generate data for comparison between cable specimens using the same stiffness and springback apparatus. Stiffness and springback affect harness manufacturing, harness and cable installation, and maintenance operations. The stiffness of the test specimen is identified as the maximum torque observed at the application of a 90 degree bend and the […] Read more
Dust
The dust test evaluates an electronic component’s ability to endure an atmosphere laden with dry dust. A component sample is placed in a chamber where circulating fans move the dust laden air at a specified speed. The component under test is subject to a series of exposures between which the air speed, humidity, and temperature […] Read more
Environmental Stress Crack
Environmental stress crack tests a sample ethylene plastic’s susceptibility to cracking as a result of environmental stress and the presence of selected chemicals (soaps, oils, detergents, etc.). Pre-damaged samples are mounted into the test fixture and submerged in a selected reagent (may depend on standard/ application) at a specified temperature. Specimens are inspected for evidence […] Read more
Equivalent Series Resistance (ESR)
A polarized capacitance bridge is used to measure equivalent series resistance of a capacitor. The Pass/ fail criteria are determined by the product specification sheet. Read more
Fluid Absorption
The fluid absorption test evaluates the ability of a cable sleeve to prevent absorption of external fluids. Testing is performed using fluids as identified in the sample’s product specification. A test sample is cut longitudinally to create a flat strip of sleeving. This strip is affixed to a dry piece of cardboard and mounted to […] Read more
Examination – Wired Contacts
As with any aerospace EWIS component, contacts and connectors should be thoroughly inspected for conformity to the product specification and to ensure no defects are present. This examination specifically applies to wired contacts. Samples are visually inspected at 3X magnification to identify defects in the contact(s). A sample will fail the examination if the presence […] Read more
Insulated Coverings
The ASTM B267 standard provides requirements and suggestions in the use of insulated wire coverings such as silk, nylon, cotton, and glass which can be verified at Lectromec. The standard requires that, when present, an outer layer of covering must be wrapped in the direction opposite to the inner covering. This and other physical characteristic […] Read more
PTFE Tape-Wrapped Jacket Delamination
Delamination is a particularly important consideration in any wrapped insulation/ jacket; separation of the tape layers may lead to unraveling of the jacket and/or significant electrical failures. This test is a visual examination of a tape-wrapped PTFE jacket intended to identify any evidence of delamination. See also Delamination/ Lamination Sealing Read more
Jacket Flaws (Spark Test)
The jacket flaws test (spark test, insulation-continuity proof test, or insulation faults test) aims to identify any defects in a wire/ cable’s outer insulation that would allow an amount of leakage current. Testing is performed in an enclosure filled with conductive metal beads/ balls. The beads are electrified and connected to a continuity detection circuit […] Read more