All Questions
29 questions
3
votes
0
answers
138
views
FCC exemption for sub 1.705 MHz devices
The exemption section of the FCC rules on unintentional radiators (Title 47, chapter I, Subchapter A, Part 15, Subpart B, Section 15.103) has the following item :
(h) Digital devices in which both ...
- 31
2
votes
1
answer
90
views
EMI standards just for power on/off
I know the FCC has EMI/EMC maximums for connected emissions into the AC power cable while electronics are on.
But, are there FCC requirements on the brief connected emissions/bursts when the ...
- 728
1
vote
1
answer
266
views
How to prepare my firmware for FCC Part 15 testing
I have a device for which I want to do FCC Part 15 testing - unintentional radiation. (It includes an ESP WROOM Wifi/Bluetooth module with modular approval).
This device connects to wifi every 20 ...
0
votes
1
answer
133
views
How do you build a spurious emissions test rig?
Naively, it seems like you could test for spurious emissions by:
Placing the device-under-test (DUT) in a grounded metal box with a broadband antenna inside.
Hook the antenna's coax cable to the S21 ...
- 2,200
0
votes
0
answers
200
views
Spurious measurements FCC
I was wondering if someone can help me with a project at work. I am very very new into RF.
I work for an EMC/EMI lab and we want to do some spurious emissions testing and establish a test procedure ...
- 554
2
votes
2
answers
244
views
Which products require EMC certificate?
What are the guidlines (or where can I find them) for which products require EMC testing certificate? I know that this determined per country, so for starters let's go with the US.
My product contains ...
- 159
1
vote
1
answer
78
views
FCC rules for wideband / spread spectrum devices
I'd like to clarify how the FCC measures power in a frequency band (both for intentional and unintentional radiators). There are devices which either frequency hop (output is a sine wave, but center ...
- 3,541
3
votes
2
answers
100
views
Why are radiated emissions standards for consumer electronics different from industrial?
Why are radiated emissions standards for consumer electronics different from industrial?
Source:??
- 61
0
votes
2
answers
2k
views
Is EMI/EMC still a big concern for a PC case?
I've recently started looking into researching potential concerns when it comes to using a non-metal material for a custom PC case, specifically wood. I've seen people talk about heat, electrical ...
- 3
1
vote
0
answers
56
views
Is EMC (FCC and EU) testing performed as sold or as used?
I have a prototype that inserts a fairly weak ISM band RF signal (HF/VHF) as a way of detecting a connection between two metal objects without there being a DC return path (Ideally I would use TDR but ...
- 31
1
vote
2
answers
1k
views
FCC certified module with uncertified antenna: technical or legal issue?
Say I have a consumer device that uses a pre-certified WiFi module. As I understand it, radio modules are certified with a fixed set of antenna choices that were included as part of the module's ...
- 1,428
4
votes
3
answers
814
views
Why are "devices utilized exclusively in any transportation vehicle" exempted from FCC compliance testing?
I was researching whether do we need to do FCC compliance testing for a device we developed for a client. Curiously, it seems to be in the list of exemptions (passage taken from here):
A digital ...
- 5,497
0
votes
3
answers
218
views
Viable alternative for expensive MLCC capacitor?
I'm thinking of building and selling a product which uses a DC-DC isolator. I've been prototyping with Recom RI3 3W Isolated DC-DC Converter Through Hole, Vin 5 V dc, Vout 9V dc, I/O isolation 1kV. ...
- 289
3
votes
3
answers
1k
views
EMC Testing, Radiated Emissions
I recently had one of my new rechargeable Lithium Ion products tested (RE pre-compliance scan) and I had a few frequencies (around 150 MHz) pop (7-10 dBuV/m) above the FCC and CISPR limits.
I'm not ...
- 31
1
vote
2
answers
496
views
Legal to use non FCC-approved radio devices purchased locally?
Does anyone know if it's legal to use non FCC-approved radio devices which are purchased locally? For instance, if the device is purchased from a local eBay seller, is it still legal to use it in any ...
- 903
5
votes
1
answer
545
views
Arduino Cellular Shield EMC Testing for FCC
I have designed an Arduino shield that uses an FCC pre-certified and PTCRB cellular module and I'm wondering about EMC testing and FCC compliance. However, the main concern here is that I am using a ...
5
votes
1
answer
513
views
FCC Part 15 Class B Declaration of Conformity (DoC)
I'm familiar with Part 15 FCC testing for intentional radiators (3 meter limits of certain power, must be filed with FCC, requires accredited lab), but I'm a little unclear on the Class B ...
- 1,937
1
vote
1
answer
260
views
Measuring Peak Output Power for Frequency Hopping Transmitter (915MHz) for FCC Section 15.247
I've been looking at building a ~900MHz frequency hopping transmitter that conforms to FCC Section 15.247.
See section 3.2.1 Frequency Hopping Spread Spectrum Requirements in the Semtech document ...
- 1,937
8
votes
2
answers
221
views
Sequencing modes for FCC "Intentional Radiator" test
I'm FCC certifying as an "intentional radiator" a product that uses a custom antenna and off the shelf Broadcom WiFi module. The module has an antenna port, so single-modular and limited single-...
- 869
2
votes
1
answer
150
views
Intentional RF emitter failing unintentional emission test?
Suppose a commercial product uses a FCC pre-certified WiFi module. If the quality is not consistent throughout the batch, I'd guess some pre-certified modules may produce unacceptable emissions. In ...
- 903
0
votes
1
answer
186
views
FCC approval and quantity
I see that often commercial radio devices go through EMC tests and attain FCC approval. Do all commercial radio devices need to be approved by the FCC though? According to this:
The radio frequency ...
- 903
5
votes
2
answers
2k
views
How do I cycle a WiFi transmitter through all modes, for FCC intentional radiator EMC testing?
I'm integrating a WiFi/Bluetooth module into a consumer product, however
the module does not have a modular grant, will not have a modular grant, and is anyway getting paired with a unique internal ...
- 869
0
votes
1
answer
83
views
Where can I find test labs for FCC and other unintended radio emissions testing? [closed]
Where can I find labs where I can pre-test or certify an electronic product intended for sale, according to FCC rules? I've searched the FCC website for a list of certified labs, without finding such ...
- 869
4
votes
2
answers
856
views
FCC-approval and "modular" integration
I see that a PCB requires certification even if it incorporates a certified RF module, so EMC tests for spurious emissions will still be needed. Is FCC-approval needed if a Raspberry Pi is shipped/...
- 1,557
4
votes
1
answer
243
views
Will FCC EMC tests need to be redone?
In light of the new FCC rules that Chinese (and all non-MRA) labs will no longer recognised in July and all EMC tests need to be done at FCC-authorized Telecommunications Certification Bodies, for FCC ...
- 173
1
vote
2
answers
469
views
Switcher discontinuous mode - potential EMI problem
I need to design switching mode power supply with input voltage range of 25V-45V and output voltage 5V@2A.
Power supply must be ON while the system is in sleep mode(~1mA consumption). In that ...
- 719
0
votes
1
answer
196
views
Walk-in EMC testing a Bluetooth speaker
I'm hoping to see if my Bluetooth speaker could pass FCC Part 15. No certification is needed at this point - just to purely see if it'd pass when it becomes ready for certification. I believe this is ...
- 1,557
8
votes
2
answers
813
views
EMC testing of unenclosed PCB assembly
What is the most common practice in performing EMC tests for PCB assemblies that will be sold without a housing? In my case it is an FPGA development board. Is it possible to design excessive ...
- 705
4
votes
3
answers
984
views
At what point does the responsibility of the manufacturer end with regards to FCC/CE testing?
I'm curious as to when the responsibility of a manufacturer ends when dealing with emissions and RF testing, part of FCC and CE tests.
I repair TVs as a hobby and as business. I got a TV in from ...
- 32.2k