I have been told there is no hard and fast rule for the exposure level (power) as it is frequency dependent.
I do know that free space (50 feet away) at 30MHz is around 55 watts with approximately a 3 dB gain antenna ( not in the main lobe of this antenna). Your location may be different, and this is NOT in a Anechoic or shielded room. KB5UKT Michael Sundstrom OHD / TREQ Dallas Electronic Lab Analist, EMC Lead 2170 French Settelment Rd, Suite B Dallas, Texas 75212 (214) 579 6312 (940) 390 3644c From: Cortland Richmond [mailto:[email protected]] Sent: Wednesday, August 11, 2010 7:29 AM To: [email protected] Subject: Re: [PSES] RI query Try the FCC! quote: OET Bulletin No. 65 (August 1997) Evaluating Compliance With FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields This revised OET Bulletin 65 has been prepared to provide assistance in determining whether proposed or existing transmitting facilities, operations or devices comply with limits for human exposure to radiofrequency (RF) fields adopted by the Federal Communications Commission (FCC). The bulletin offers guidelines and suggestions for evaluating compliance. However, it is not intended to establish mandatory procedures, and other methods and procedures may be acceptable if based on sound engineering practice. unquote LINK: http://www.fcc.gov/oet/info/documents/bulletins/ I made reference to it for some testing. Watch your duty cycle! Cortland Richmond KA5S ----- Original Message ----- From: Ron Pickard To: [email protected] Sent: 8/10/2010 9:23:00 PM Subject: RI query [SNIP] concern has been floating around here for some time about the hazards to a human being that would be in close proximity to the generated EMI of a radiated immunity test. With some products, manual operation manipulation is needed to exercise portions of the product during this testing, which is where this question originates. The concern here relates to the proliferation of cases associated with close proximity to humans and any legal/ perspectives due confining a human in fully shielded and/or anechoic chamber during this test. To that end and in the USA, does OSHA impose any restrictions with this particular type of testing? Are there any maximum permissible exposure limits for this testing environment? If so, at what field intensity(ies) will precautions need to be taken - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
