Muriel: The input impedance of your spectrum analyzer is very close to 50 Ohms throughout the specified frequency range. Most of the time, you can forget about this variable. A lot of design effort goes into this area. The only time you may have even a small a concern is when you are using the 0dB RF (or input) attenuator position. The easiest way to find out is to check with the SA's manufacturer.
The impedance of a loudspeaker varies with frequency, and is affected by both the electrical and mechanical design of the device. As to the impedance of your "network", I don't understand if you are referring to your LISN's or your local public power grid. Your LISN's can be verified using a vector impedance meter or a network analyzer. You could even set up a test system to measure input voltage and current and calculate the impedance. Unless you view this as a learning experience, it's probably far cheaper to send the LISN's out to a cal lab than to do it yourself. As to measuring the AC power source impedance, well, time to go home now! <grin> Regards, Ed :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 619-505-2780 (Voice) 619-505-1502 (Fax) Military & Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) > -----Original Message----- > From: Muriel Bittencourt de Liz [SMTP:mur...@grucad.ufsc.br] > Sent: Friday, November 12, 1999 1:52 PM > To: david_l_tarnow...@email.whirlpool.com > Cc: Lista de EMC da IEEE > Subject: Re: 60 Hz Power Line Impedance > > > Group and Mr. Tarnowski, > > I don't know the answer for this question, but it lead me to other doubt > I have... > > When read in my Receiver/Spectrum Analyzer: 50 Ohms, what is the > frequency range on which this impedance is valid? This question also > applies to impedance of loudspeakers (generally 8 or 4 ohms)?? > > And the impedance of my network? How do I determine? > > Thanks in advance for those who answer... > > Good Weekend!! > > Muriel > > david_l_tarnow...@email.whirlpool.com wrote: > > > > > > Fellow Networkers; > > > > Does there exist information about the impedance (at 60 Hz) of > typical > > power line networks here in the US? > > > > In Europe, I know they use a specified reference impedance (at 50 > Hz) > > for flicker testing, which is (0.24 + j0.15) Ohm for line and (0.16 > + > > j0.10) Ohms. This represents, I understand, the European public > > network impedance as seen at the point of "common coupling" (i.e., > > connection to the homes service entrance). > > > > David Tarnowski > > Whirlpool Corporation > > Global Laundry Controls > > St. Joseph, MI > > > > > > --------- > > 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). > > -- > ====================================================================== > Muriel Bittencourt de Liz > GRUCAD - Group for Conception & Analysis of Electromagnetic Devices > Santa Catarina Federal University - UFSC > PO Box: 476 ZIP: 88040-900 - Florianópolis - SC - BRAZIL > Phone: +55.48.331.9649 - Fax: +55.48.234.3790 > e-mail: mur...@grucad.ufsc.br > ICQ#: 9089332 > Alternativa Adreso: mur...@esperanto.nu > > --------- > 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). > --------- 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).
