Well put, Jon. Let's not forget that all of that additional testing not only costs the manufacturer time and test money, but there is the also additional cost of at least two more sample units which may now no longer be sold as "new" units (having been used). Some of the units my company manufactures carry a list price in excess of $50,000 US. My accounting department would not like to have me write off that much in equipment every time I test, and my budget won't support that. In the end, it'd mean that the consumer would end up paying even higher prices to purchase product from companies who are trying to "do the right thing," or that the companies who are conscientious will go out of business in favor of companies who either don't do testing (yes, they exist!) and sell lots of stuff to consumers on the cheap, or those that do minimal testing.
I'd love to be able to take up three OATS and test my equipment. I just can't do that. Besides, my test lab doesn't have the site time available to run all of those tests for al of their clients. Steve Chin StreamLogic Corp. Menlo Park, CA, USA [email protected] The views expressed in this communication belong only to their authors. They do not necessarily reflect those of their employers or each others'. -------------------------------------- List-Post: [email protected] Date: 1/13/97 7:04 PM To: Steve Chin From: Jon D Curtis Dear Hans, I know of no manufacturers actually engaged in series production audits. So lets hear from them. Please respond to this forum. The companies I work with look to CISPR 22 8.2.1.1 and test one sample. Some of them are happy with 0dB margin. I advise a higher margin, but they are responsible for signing the DoC. To date it would appear to me that the 80/80 rule only has a place in making it harder to take product off the market. You can go to market with only one sample tested, but if someone wants to restrict your access they have to perform an 80/80 rule statistical test to say you fail (CISPR 22 8.2.4). As a test lab, I'd love the 80/80 rule if the market would support it (three-five times the testing, yippee!). The doctrine also seems to need a bit of clarification: Xn is refered to as the value of the individual item. Is this the value of the one point closest to the limit? Can you change the frequency? On a product do you evaluate more than one frequency? How many? - the six closest to the limit? When doing more than one test, are several 80/80 tests performed - one for radiated, one for conducted? The 80/80 test is a statistician's dream and a test engineer's nightmare. Jon D. Curtis, PE Curtis-Straus LLC [email protected] One-Stop Laboratory for EMC, Product Safety and Telecom 527 Great Road voice (508) 486-8880 Littleton, MA 01460 fax (508) 486-8828 http://world.std.com/~csweb On Mon, 13 Jan 1997 [email protected] wrote:
