We use Hewlett Packard and Rohde & Schwarz pre-amplifiers for CISPR xx class B measurements above 700 MHz, which is when the noise floor starts to bite at the 6dB clearance criterion.
We do commercial measurements at mandated test distances only. A 1 m test distance is specified for MIL testing only. A zoomed in measurement from 3m to 1m to beat the noise floor is not recommended as the antenna and EUT dimensions become critical. Hope this helps Regards Arun Kaore EMC Engineer ADI Limited Test & Evaluation Centre Forrester Road, St Marys NSW 2760 P O Box: 315, St Marys NSW 1790 Tel: 61 2 9673 8375 Fax: 61 2 9673 8321 Email: kao...@sg.adi-limited.com.au <mailto:kao...@sg.adi-limited.com.au> -----Original Message----- From: John Cronin [mailto:croni...@hotmail.com] <mailto:[mailto:croni...@hotmail.com]> Sent: Thursday, 26 August, 1999 7:50 To: emc-p...@ieee.org <mailto:emc-p...@ieee.org> Subject: Amplifier for measurements above 1GHz I am hoping to purchase a 1 to 5 Ghz amplifier to be used in conjunction with a spectrum analyzer to measure emissions at 3m to FCC requirements. With a 1 MHz bandwidth into a HP microwave analyzer we can only currently measure at 1m. Can we get away with measurements at 1m? Can anyone recommend a low cost microwave amplifier that is suitable for the task? Thanks in anticipation of your response. John Cronin ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com <http://www.hotmail.com> --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org <mailto:majord...@ieee.org> with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com <mailto:ed.pr...@cubic.com> , jim_bac...@monarch.com <mailto:jim_bac...@monarch.com> , ri...@sdd.hp.com <mailto:ri...@sdd.hp.com> , or roger.volgst...@compaq.com <mailto:roger.volgst...@compaq.com> (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
