These days Harry is supporting NASA at the Johnson Space Flight Center. He is no longer running a commercial test facility.
-- Ken Javor Ph: (256) 650-5261 From: Ralph McDiarmid <[email protected]> Reply-To: <[email protected]> Date: Tuesday, October 8, 2024 at 11:06 AM To: <[email protected]> Subject: Re: [PSES] technical musings Happy to hear that Harry is still working in the industry. I met with him many times, long ago when he ran Acme Testing in Acme, WA. Ralph From: David Schaefer <[email protected]> Sent: October 8, 2024 8:14 AM To: [email protected] Subject: Re: [PSES] technical musings Harry Hodes gave a presentation at the C63 meetings last week on proficiency testing. He runs the ACIL PT program, and the data he shared showed a ton of variance. Many labs were in I think +/-3-4 dB range, but there were outliers – the worst cases being one lab reading 30-40 dB high, another 30-40 dB low. If I recall correctly for one PT program 95 labs participated and around 10 were outside the expected tolerance. Doing a check of the measurement system prior to testing is critical. A comb gen scan takes only a few minutes but should catch these egregious errors. David Schaefer Technical Manager Element Materials Technology 9349 W Broadway Ave Brooklyn Park , MN 55445 , United States O +1 612 638 5136 ext. 10461 [email protected] www.element.com From: doug emcesd.com <[email protected]> Sent: Monday, October 7, 2024 6:08 PM To: [email protected] Subject: [PSES] technical musings CAUTION:This email originated from outside of Element Materials Technology. DO NOT click links or open attachments unless you recognize the sender and know the content is safe. Please contact the TOC if you are in any doubt about this email. I have seen differences of 9 dB on the same measurement on an EUT and comb generator by different accredited labs! Doug This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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