ANSI IEEE C63.5 ( [Electromagnetic Compatibility-Radiated - download pdf or read online
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Additional info for ANSI IEEE C63.5 ( [Electromagnetic Compatibility-Radiated Emission Measurements in Electromagnetic Interference -EMI- Control-Calibration of Antenas. 9 kHz to 40 GHz] [EMC] [73pages]
7) Temperature variance during measurements shall be less than 5 °C between direct measurements. This includes all cables. Relatively low ambient noise levels are recommended to achieve the recommended 16 dB signal-to-noise ratios. Lower site attenuation deviations from ideal are also recommended. 3 Measurement configuration Prior to beginning the measurement set up take the following steps: 1) Distinguish between transmit and receive antennas. Mark the antennas for future reference. 1. 3) The same antenna element setup condition must be applied at the SACS and the qualifying site measurement.
The usual calibration would be carried out at the number of frequencies indicated in Table 2 (Table 3 for horn antennas at 1 GHz and higher). 4. ) Test setup data Frequency (fM) 30 MHz Spacing ( R) 10 m Source Height (h1) 2m Search Height (h2) 1-4 m Steps (Substitution Method): 1) Allow the signal generator, amplifier or preamplifier and measuring instrument to warm up and stabilize as specified by the manufacturer of the equipment. Care should be taken if multiple band amplifiers are used. These amplifiers may require additional time to warm up when switching bands, since different components may be used in each band and those components are not necessarily stable when the band is switched.
7-2005 and this annex. Third, the site shall comply with the statistical criteria described in this annex. Two measurements are needed to determine GSCF for a pair of antennas: (1) measure the SA in the nearfree-space geometry and (2) measure the SA in any additionally required geometry. 1). GSCF = [EdmaxGS + AGS] – [EdmaxNFS + ANFS] where A Edmax = site attenuation at SACS for specified geometry = computed maximum E-field for a specified geometry (Annex A) 47 Copyright © 2006 IEEE. All rights reserved.
ANSI IEEE C63.5 ( [Electromagnetic Compatibility-Radiated Emission Measurements in Electromagnetic Interference -EMI- Control-Calibration of Antenas. 9 kHz to 40 GHz] [EMC] [73pages]