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IEEE C63.12-2015 pdf free

IEEE C63.12-2015 pdf free.American National Standard Recommended Practice for Electromagnetic Compatibility Limits and Test Levels.
Instrumentation and measurement methods uscd for determining equipment emission characteristics are described in detail in ANSI C63.2 and ANSI C63.4, respectively. ANSI C63.5 provides techniqucs for emission measurement antenna calibration. These documents should be reviewed before proeeding to make emissions measurements. In particular, measurement of RF emissions as described in ANSI C63.4 relates to measurement of ermissions from specific devices in a controlled manner al a test facility. This is quite different from measuring ambient noise, as such noise is emitted from many sources, rather than one under test. As might be expected, there is much more control and repeatability in measuring a device than the general RF ambicnt. To promote repeatability and reproducibility, ANSI C63.4 has specific test setups and procedures and can be used to find the maximum enmissions. For conducted emissions, the maximum is found primarily by varying the modes of operation of the device. For radiated emissions, it is much more complex, where a receiving antenna is clevated between 1 m and 4 m to find the point of the in-phase addition of the direct and the indiret reflection as the device is rotated on a tumtable. Above 1 GHz, ground plane reflection has litle effect. However, in most cases the radiation pattern of devices become more directional. In addition, the antennas used in this frequency range may exhibit directional patterms. Therefore, a height scan and aiming of the receiving antenna are also required to properly measure the maximum emissions of a device under test.
The measurcement of radiated RF signals emitted by mutiple devices or radio tansmitters is addressed in IEEE Std 473-1985. ANSI C63.4 is focused on emission mcasurements of individual devices in a controlled environment. This standard addresses radiated and conducted emission measurements, both of which are of importance in the limit-setting process.
No single parameter can be sclected as the best for measuring interference ffects on a wide variety of services, eg. voice, facsimile, analog data, digital data, and television (TV). There is also a wide range of required service quality. In the case of interference from atmospheric radio noise, a parameter that is related to occasional lightning flashes should be chosen if a very high quality of service is desired for AM radio 100% of the time. Otherwise, a mcasure related to the average or rms level might be more appropriate.IEEE C63.12 pdf free download.

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