This part of IEC 61300 describes the procedure to monitor changes in attenuation and/or return loss of a component, an interconnecting device, a fibre management system, or a protective housing, when subjected to an environmental or mechanical test. Such a procedure is commonly referred to as active monitoring. The procedure to monitor temporary changes (generally faster) during disruptive events is given in IEC 61300-3-28.
The procedure can be applied to measurements on single samples or to simultaneous measurements on multiple samples, both at single wavelengths and multiple wavelengths, by using branching devices and/or switches as appropriate.
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