[Title 47 CFR 15.107]
[Code of Federal Regulations (annual edition) - October 1, 2004 Edition]
[Title 47 - TELECOMMUNICATION]
[Chapter I - FEDERAL COMMUNICATIONS COMMISSION]
[Subchapter A - GENERAL]
[Part 15 - RADIO FREQUENCY DEVICES]
[Subpart B - Unintentional Radiators]
[Sec. 15.107 - Conducted limits.]
[From the U.S. Government Printing Office]
47TELECOMMUNICATION12004-10-012004-10-01falseConducted limits.15.107Sec. 15.107TELECOMMUNICATIONFEDERAL COMMUNICATIONS COMMISSIONGENERALRADIO FREQUENCY DEVICESUnintentional Radiators
Sec. 15.107 Conducted limits.
(a) Except for Class A digital devices, for equipment 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 [mu]H/
50 ohms line impedance stabilization network (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 band edges.
------------------------------------------------------------------------
Conducted limit (dB[mu]V)
Frequency of emission (MHz) ----------------------------------------
Quasi-peak Average
------------------------------------------------------------------------
0.15-0.5....................... 66 to 56*.......... 56 to 46*
0.5-5.......................... 56................. 46
5-30........................... 60................. 50
------------------------------------------------------------------------
*Decreases with the logarithm of the frequency.
(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 [mu]H/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.
------------------------------------------------------------------------
Conducted limit (dB[mu]V)
Frequency of emission (MHz) ----------------------------------------
Quasi-peak Average
------------------------------------------------------------------------
0.15-0.5....................... 79................. 66
0.5-30......................... 73................. 60
------------------------------------------------------------------------
(c) The limits shown in paragraphs (a) and (b) of this section shall
not apply to carrier current systems operating as unintentional
radiators on frequencies below 30 MHz. In lieu thereof, these carrier
current systems shall be subject to the following standards:
(1) For carrier current systems containing their fundamental
emission within the frequency band 535-1705 kHz and intended to be
received using a standard AM broadcast receiver: no limit on conducted
emissions.
(2) For all other carrier current systems: 1000 [mu]V within the
frequency band 535-1705 kHz, as measured using a 50 [mu]H/50 ohms LISN.
(3) Carrier current systems operating below 30 MHz are also subject
to the radiated emission limits in Sec. 15.109(e).
(d) Measurements to demonstrate compliance with the conducted limits
are not required for devices which only employ battery power for
operation and which do not operate from the AC power lines or contain
provisions for operation while connected to the AC power lines. Devices
that include, or make provision for, the use of battery chargers which
permit operating while charging, AC adaptors or battery eliminators or
that connect to the AC power lines indirectly, obtaining their power
through another device which is connected to the AC power lines, shall
be tested to demonstrate compliance with the conducted limits.
[54 FR 17714, Apr. 25, 1989, as amended at 57 FR 33448, July 29, 1992;
58 FR 51249, Oct. 1, 1993; 66 FR 19098, Apr. 13, 2001; 67 FR 45670, July
10, 2002]