EMI/EMC Analysis Memo
Contents
1. GPR003 EMI EMC Unintentional electromagnetic radiation radiated or conducted from designs must meet US CFR Title 47 Part 15 subpart B regulations for Class A digital equipment Intentional radiators must meet subpart C regulations Exemptions from 15 103 are not allowed Title 47 Telecommunication PART 15 RADIO FREQUENCY DEVICES Subpart B Unintentional Radiators 15 101 Equipment authorization of unintentional radiators Type of device Equipment authorization required Class A digital devices peripherals amp Verification external switching power supplies Our design verification is included in the ATP 15 105 Information to the user a For a Class A digital device or peripheral the instructions furnished the user shall include the following or similar statement placed in a prominent location in the text of the manual NOTE This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will b2. e required to correct the interference at his own expense This note has been included in the user manual 15 107 Conducted limits b For a Class A digital device that is designed to be connected to the public utility AC power line the radio frequency voltage that is conducted back onto the AC power line on any frequency or frequencies within the band 150 kHz to 30 MHz shall not exceed the limits in the following table as measured using a 50 wWH 50 ohms LISN Compliance with the provisions of this paragraph shall be based on the measurement of the radio frequency voltage between each power line and ground at the power terminal The lower limit applies at the boundary between the frequency ranges Frequency of emission MHz Conducted limit dBuV 015 08 wo o f 05 30 Bo o fe Our design verification is included in the ATP 15 109 Radiated emission limits b The field strength of radiated emissions from a Class A digital device as determined at a distance of 10 meters shall not exceed the following Frequency of emission MHz Field strength microvolts meter 30 88 58 216 216 960 210 Above 980 Subpart C Intentional Radiators Our design does not include intentional radiators
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