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The parts are typically identified by adding "/APC" (angled physical contact) to the name. For example, an angled FC connector may be designated FC/APC, or merely FCA. Non-angled versions may be denoted FC/PC or with specialized designations such as FC/UPC or FCU to denote an "ultra" quality polish on the fiber end face.
Mechanical vibration with frequency between 10 and 70 kHz and amplitude of 10 to 250 μm is applied to joining parts. After ultrasonic energy is turned off, the parts remain in contact under pressure for some time while the melt layer cools down creating a weld. [2] Different join designs and process controls are used in ultrasonic welding.
PM FC/PC connectors typically use FC/APC keying since the angular alignment tolerance is tighter. Some connector designs have the key as a separate, indexable component. This can allow for some reduction in insertion losses (depending on the concentricity accuracy of the ferrule) by allowing the ferrule to be rotated to a more fortuitous alignment.
A more sophisticated SPC chart may include "control limit" & "spec limit" % lines to indicate whether/what action should be taken. Statistical process control (SPC) or statistical quality control (SQC) is the application of statistical methods to monitor and control the quality of a production process. This helps to ensure that the process ...
System Planning Corporation (SPC) is a Virginia-based corporation founded in 1970 that produces military electronics, such as flight control systems, [1] radar, and Systems Engineering and Technical Assistance in airwarfare, cybersecurity, program management and research of advanced weapons systems, advanced space systems and advanced microsystems for the United States Department of Defense (DoD).
The Western Electric rules are decision rules in statistical process control for detecting out-of-control or non-random conditions on control charts. [1] Locations of the observations relative to the control chart control limits (typically at ±3 standard deviations) and centerline indicate whether the process in question should be investigated for assignable causes.