[Code of Federal Regulations]
[Title 47, Volume 1]
[Revised as of October 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR15.107]
[Page 688-690]
TITLE 47--TELECOMMUNICATION
CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
PART 15--RADIO FREQUENCY DEVICES--Table of Contents
Subpart B--Unintentional 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 450 kHz to 30 MHz shall not
exceed 250 microvolts. Compliance with this provision shall be based on
the measurement of the radio frequency voltage between each power line
and ground at the power terminals.
(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 450 kHz to 30 MHz shall not exceed the limits in the
following table. Compliance with this provision shall be based on the
measurement of the radio frequency voltage between each power
[[Page 689]]
line and ground at the power terminals. The lower limit applies at the
band edges.
------------------------------------------------------------------------
Conducted
Frequency of emission (MHz) limit
(microvolts)
------------------------------------------------------------------------
0.45 to 1.705............................................. 1000
1.705 to 30.0............................................. 3000
------------------------------------------------------------------------
(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 uV within the
frequency band 535-1705 kHz.
(3) Carrier current systems operating below 30 MHz are also subject
to the radiated emission limits in Sec. 15.109(e).
(d) The following option may be employed if the conducted emissions
exceed the limits in paragraph (a) or (b) of this section, as
appropriate, when measured using instrumentation employing a quasi-peak
detector function: if the level of the emission measured using the
quasi-peak instrumentation is 6 dB, or more, higher than the level of
the same emission measured with instrumentation having an average
detector and a 9 kHz minimum bandwidth, that emission is considered
broadband and the level obtained with the quasi-peak detector may be
reduced by 13 dB for comparison to the limits. When employing this
option, the following conditions shall be observed:
(1) The measuring instrumentation with the average detector shall
employ a linear IF amplifier.
(2) Care must be taken not to exceed the dynamic range of the
measuring instrument when measuring an emission with a low duty cycle.
(3) The test report required for verification or for an application
for a grant of equipment authorization shall contain all details
supporting the use of this option.
(e) As an alternative to the conducted limits shown in paragraphs
(a) and (b) of this section, digital devices may be shown to comply with
the standards contained in the Third Edition of International
Electrotechnical Commission (``IEC''), International Special Committee
on Radio Interference (CISPR) Pub. 22 (1997), ``Information Technology
Equipment--Radio Disturbance Characteristics--Limits and Methods of
Measurement.'' This incorporation by reference was approved by the
Director of the Federal Register in accordance with 5 U.S.C. 552(a) and
1 CFR part 51. Copies of CISPR publications may be purchased from Global
Engineering Documents, P. O. Box 8500 (S-4485), Philadelphia, PA 19178-
4485, (303) 792-2181 or (800) 624-3974. Copies also may be inspected,
but not reproduced, during normal business hours at the following
locations: Federal Communications Commission, Reference Information
Center, 445 12th Street, SW., Room CY-A257, Washington, DC, and Office
of the Federal Register, 800 North Capitol Street, NW., Suite 700,
Washington, DC. In addition:
(1) The test procedure and other requirements specified in this part
shall continue to apply to digital devices.
(2) If the conducted emissions are measured to demonstrate
compliance with the alternative standards in this paragraph, compliance
must also be demonstrated with the radiated emission limits shown in
Sec. 15.109(g).
(3) Part 15 devices are not subject to the CISPR 22 limits on
conducted common mode disturbance at telecommunication ports, as shown
in Section 5.2 of CISPR, Tables 3 and 4.
(f) 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
[[Page 690]]
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]