IEEE 111-2000 pdf free.IEEE Standard for Wide-Band (Greater Than 1 Decade) Transformers.
IEEE 111 This standard pertains to electronics wide-band transformers transmitting power within a wide band offrequencies covering typically at least one decade in the frequency spectrum. It is not intended to apply totransformers optimized to operate within a narrow band of frequencies.Transformers used in, or in conjunc-tion with, wire line communication facilities serving power stations are excluded due to the special protec-tion requirements involved. Provision is made for including data for use in the design of feedback amplifiersand control networks, or other circuits in which the knowledge of the transformer amplitude and phase-frequency response is needed by the system designer. These transformers are required to transform voltagewithin specified tolerances of amplitude and phase when operating between specified impedances.Guides toapplication and test procedures are included.The annexes within this standard contain certain precautionsand recommended practices.
This standard also pertains to hybrid transformers, primarily used in the telecommunications industry.Thehybrid transformer is a wide-band transformer used in a manner which makes it part of a capacitance , resis-tance, and/or inductance network, and it must have characteristics which permit it to match the network forproper overall performance.
Audio frequency transformers may cover a limited frequency range such as that used in voice communica-tions, or may cover a part or all of the frequencies from 5 Hz to 100 000 Hz when used in high fidelity orsimilar amplifiers. Voltages or signals correspond directly to speech or music amplitude and phase variationswithin this range of frequencies. Performance characteristics one or more octaves beyond the specified rangemay be of interest and specified. Feedback and other windings or taps may be incorporated in the design.The mode or class of amplifier operation (i.e.,Class A,B,AB, etc.) must be recognized and taken intoconsideration.
Transducer service transformers are stepdown ratio transformers having one or more secondary windingswith or without center taps. The load impedance may be permitted to vary with frequency or with otherparameters, but the transformer performance is generally based on a specific load impedance.
Random noise transformers are used in vibration machine applications. They are subject to random signalsof varying amplitude and duration.Response may be expressed in terms of the frequency spectrum but theamplitude variation allowable over the relevant frequency range is much greater than for audio-frequencytransformers because of the Gaussian distribution of random noise.Random noise transformers are oftenincluded in feedback loops. When included in such a loop, their amplitude and phase response is of interestand all of the problems listed in 9.3 must be solved in addition to producing a transformer capable ofhandling the amplitude of random noise.IEEE 111 pdf download.