As we often test immature prototypes with high emissions, I am quite concerned about out-of-band emissions-related effects, and consider a "real" preselector to be a mandatory part of any system we switch over to. The manufacturers may be able to tell me that they solve the same problem a different way, but I know what my starting position is. In fact we currently use 3 protective elements: a 100kHz high-pass filter, a transient limiter, and a pre-selector (moving from the EUT end of the chain towards the SA) and have found we need all three. Amazing the spectrum you get when a really large 50kHz switching fundamental slams into the transient limiter.
Jim Eichner, P.Eng. Compliance Engineering Manager Xantrex Technology Inc. e-mail: [email protected] web: www.xantrex.com Confidentiality Notice: This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. From: John McAuley [mailto:[email protected]] Sent: Tuesday, December 02, 2008 9:46 AM To: Jim Eichner; [email protected] Subject: RE: EMI Receiver I notice Rohde and Schwarz have a new "low cost" ESL receiver. Unlike previous "pre compliance" receivers it appears to be compliant to CISPR 16 even for the 1 Hz QP prf. However, it has no pre selection. I note the recent comments about modern receivers having less sophisticated pre selection. This one has none. Probably uses clever digital filters to perform bandwidth, QP and Average functions based on a basic spectrum analyzer front end. I presume that this instrument can be used for full compliance testing, however, one needs to be very careful about the accuracy of the measurement. By careful use of input attenuation and observing the results, a traditional skill used by users of spectrum analysers may help? BR John McAuley From: [email protected] [mailto:[email protected]] On Behalf Of Jim Eichner Sent: 02 December 2008 08:03 To: [email protected] Subject: RE: EMI Receiver Indeed, however while I too may be losing the will to live, I still have the will to search out a new spectrum analyzer (note I learn from my experiences and have dropped the term-that-shall-remain-unspoken from this posting). So dare I repeat my question and that of Tim's original posting: does anyone care to sing the praises of any particular make/model for pre-compliance radiated and conducted emissions testing? Jim Eichner, P.Eng. Compliance Engineering Manager Xantrex Technology Inc. e-mail: [email protected] web: www.xantrex.com Confidentiality Notice: This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. From: [email protected] [mailto:[email protected]] On Behalf Of Julian Jones Sent: Monday, December 01, 2008 8:49 AM To: Untitled Subject: RE: EMI Receiver Can we please drop this topic now..............I am beginning to lose the will to live. From: [email protected] [mailto:[email protected]] On Behalf Of Price, Edward Sent: 01 December 2008 16:53 To: Untitled Subject: RE: EMI Receiver > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of Ken > Javor > Sent: Monday, December 01, 2008 8:47 AM > To: Untitled > Subject: Re: EMI Receiver > > This may be one of those usage differences that occur on opposite > sides of the Pond. After all, what we in the USA call a billion, you > call a milliard, and what you mean by a billion is what we call one > trillion. > > Ken Javor So USA 2 billion is a UK billiard? Ed Price [email protected] WB6WSN NARTE Certified EMC Engineer & Technician Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (FAX) Military & Avionics EMC Is Our Specialty - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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