定价：

定价：

定价：

定价： 无文本

定价：

定价：

定价：

定价：

定价：

定价：

This guide provides information on construction of radiated emission test facilities in the frequency range of 30 MHz to 40 GHz. Standardized site validation methods above 18 GHz remain unavailable at present, however the changes in this edition are considered appropriate guidance for use up to 40 GHz. In general, the construction techniques described apply either below 1 GHz, or for 1 GHz and above. This guide does not address construction code compliance issues. Parties responsible for the… read more design and construction of test sites are advised to consult with the various authorities having jurisdiction (AHJ) to determine the building, HVAC, plumbing, electrical, etc., codes and regulations that are applicable for the test site. In addition, beyond the similarity of basic principles, this guide also does not specifically address considerations on construction of test sites used for calibration of antennas used in EMC radiated emissions measurements; that topic is covered in ANSI C63.5.1,2 In addition, site-dependent measurement instrumentation and signal cabling issues are not in the scope of this guide. read less

定价： 81元 / 折扣价： 69 元

定价：

This recommended practice covers definitions of terms, controlled test conditions, test apparatus, test methods and data presentation, all of which form the basis for establishing the energy levels of spurious emissions of mobile communication transmitters designed to generate frequency-modulated (FM) signals in the frequency range of 25 MHz to 1000 MHz. Procedures for measuring both broadband and narrowband spectra are provided for both conducted and radiated emissions. Specified limits are… read more not included. However, reference values which are not limited by the state of the art are provided. Transmitter test conditions, apparatus and method are based on standard instrumentation and measuring techniques and do not require any special apparatus other than necessary terminal simulators. The procedures do not cover the associated antenna and transmission lines. read less

定价： 113元 / 折扣价： 97 元

The greatly increased use of the radio-frequency spectrum above 300 megacycles since World War II made necessary a re-examination of the interference problem. Not only may interference occur between equipments and services operating at these high frequencies, but also interference may be caused by equipments operating at lower frequencies with appreciable harmonic radiation above 300 megacycles. In particular, electromagnetic radiation from radio-frequency industrial, scientific and medical… read more equipments may cause interference to communication services above 300 megacycles. In order to eliminate objectionable interference, the Federal Communications Commission, after collaboration with manufacturers and users of such equipment, established certain regulations including limits of permissible radiation. Conformance with these regulations requires that field intensity measurements be made. At the present time, measurement standards above 300 megacycles are in the process of development. There are no commercially available field intensity meters with which measurements can be made at frequencies higher than 1000 megacycles. Until the development of standard methods and equipment has been completed, there is a need for a uniform practice for the measurement of field intensities above 300 megacycles read less

定价： 49元 / 折扣价： 42 元

定价：