EMC Testing for North America – FCC Compliance Testing
FCC – EMC Testing for North America
Nearly every electronics device sold inside the United States of America radiated unintentional emissions and must comply with appropriate regulations before it can be advertised or sold in the US market. The Federal Communications Commission (FCC) rules and regulations are used to test products against. For EMC compliance Title 47 CFR Part 15 is used and is suitable non intentional or unlicensed intentional radiators (transmitters etc.). FCC part 15 is broken down into sub-sections as follows:
A – General
B – Unintentional radiators
C – Intentional radiators
D – Unlicensed PCS devices
E – Unlicensed NII devices
F – Ultra-wide-band operation
G – Access Broadband over Power Line
H – Television Band Devices
The main two sections of applicability for the majority of devices tested are FCC part 15B and FCC part 15C.
FCC Part 15 sub-part B – Unintentional radiators
Sub-part B deals with unintentional radiators these are devices which do intentionally produce radio waves, but do anyway such as computers etc.
Under this section a device must comply with radiated and conducted emissions. Radiated emissions is the energy radiated into free space from the entire unit as a whole including cabinet radiation and cable radiation. Conducted emissions is the energy radiated conducted back to the mains network. For both radiated and conducted emissions there are two sets of limits, Class A and Class B.
Unintentional radiators are designated into two major classes:
Class A Device marketed for use in business/industrial/commercial environments.
Class B Device marketed for use in a residential environment, notwithstanding use in industrial or commercial environments
Both limits defined are generally acceptable independent of the environment they are intended to be used. However application of the product warning labels and accompanying product documentation may differ.
FCC Part 15 Sub-part C – Intentional radiators
Subpart C deals with devices that are specifically designed to produce coherent radio waves, such as small transmitters. Types of transmitters in this sub-part would include such as remote devices, Bluetooth, Zig Bee, 2.4GHz wireless technologies and so on.
So how does this affect you?
If you intend to sell/distribute your product in North America you must meet the relevant FCC rules and regulations and ensure the correct EMC Testing for North America is performed with an appropriate testing facility.
How do I test my product?
Testing should be conducted at a test facility with an FCC registered site in order to perform the measurements. An FCC test site must technically conform with the physical characteristics defined and the test site validation results must be sent to the FCC for review and subsequent grant of the registered test site. In late 2014 the testing facility must also be accredited by a mutually recognised accreditation service such as NATA.
Can I use results from CE or RCM testing
It may be possible to use the same results depending upon the methodologies used (as many of the intentional radiators/transmitter testing methodologies vary between FCC and CE). In addition if the product is mains powered it must be powered by 120VAC at 60Hz. It may be possible to use the CE radiated emissions results if your product has a DC input port and a separate AC/DC plug pack that is already FCC and CE compliant (but conducted emissions is still required).
Do I need to affix the FCC logo to my device?
Depending upon the product classification may mean that you only need to provide a statement in the documentation otherwise a separate marking may need to be permanently affixed to your product.
For further information on the FCC product labeling requirements please refer to the Office of Engineering and Technology (OET) FCC Quick labelling Guide.
EMC Testing for North America – Verification or Certification
All intentional radiators (transmitters) must be certified by the FCC or the Technical Certification Body (TCB) before legally been sold in North America.
For unintentional radiators (except as otherwise exempted in FCC Part 15.23, 15.103, and 15.113) shall be authorised prior to the initiation of marketing, as follows:
Type of device
Equipment authorization required
|TV broadcast receiver||Verification.|
|FM broadcast receiver||Verification.|
|CB receiver||Declaration of Conformity or Certification.|
|Super regenerative receiver||Declaration of Conformity or Certification.|
|All other receivers subject to part 15||Declaration of Conformity or Certification.|
|TV interface device||Declaration of Conformity or Certification.|
|Cable system terminal device||Declaration of Conformity.|
|Stand-alone cable input selector switch||Verification.|
|Class B personal computers and peripherals||Declaration of Conformity or Certification.|
|CPU boards and internal power supplies used with Class B personal computers||Declaration of Conformity or Certification.|
|Class B personal computers assembled using authorized CPU boards or power supplies||Declaration of Conformity.|
|Class B external switching power supplies||Verification.|
|Other Class B digital devices & peripherals||Verification.|
|Class A digital devices, peripherals & external switching power supplies||Verification.|
|Access Broadband over Power Line (Access BPL)||Certification.|
|All other devices||Verification.|
For further information about FCC EMC Testing for North America, refer to the Electronic Code of Federal Regulations