I'm beginning to think I'm not sure what you mean by insertion loss. If you use the 50 uH LISN for a mil-std measurement, there is a loss between power output power port and EMI port below 100 kHz that must be accounted for due to the 0.25 uF blocking cap. At and above 150 kHz, it is negligible, although some LISNs use a 0.1 uF blocking cap so that effects the loss up to higher frequencies. If by insertion loss you mean how the LISN departs from looking like 50 Ohms, that will be near zero at 450 kHz and up but not between 150-450 kHz and definitely way off below 150 kHz for the mil-std measurement.
From: emcp...@aol.com Reply-To: emcp...@aol.com List-Post: emc-pstc@listserv.ieee.org Date: Wed, 5 May 2004 18:02:50 EDT To: drcuthb...@micron.com, bstu...@dlsemc.com, emc-p...@majordomo.ieee.org Subject: Re: In-house LISN calibration Thanks Dave. ANSI C63.4 looks for the impedance curve (+/- 20% of reference) and the insertion loss (which should be a flat line, as close to zero as possible). I would need to get a bridge or some sort of adapter. Where would I get something like that. Thanks. Tim Pierce
