For our building we used a 1500W glowing (resistive impedance load) heater.
Measure before, then turn on measure after and calculate the impedance.
Also measure adjacent branches to get a feel for how much impedance was in
the branch and how much was at the transformer and drop.
This is more accurate than one would expect since about 10% of the power
gets dissipated in your wiring.
- Robert -
PS If you're after the "average impedance" for AC mains up to 2MHz,
somewhere around here I have a 1 inch thick government report where they
paid to characterize single family homes, multiple dwellings, and small
businessess. It shows not just the characteristic impedances, but also
expected attenuation. In otherwords, tells what a local area network guy
needs to know to design his system. By the way, the best range for
communications is between 100KHz and 400KHz centering at 200KHz. But be
careful, all the wireless intercoms use that 200KHz band.
-----Original Message-----
From: Price, Ed <ed.pr...@cubic.com>
To: 'Robert Johnson' <robe...@ma.ultranet.com>
Cc: 'emc-p...@ieee.org' <emc-p...@ieee.org>
List-Post: emc-pstc@listserv.ieee.org
Date: Monday, November 15, 1999 2:14 PM
Subject: RE: 60 Hz Power Line Impedance
>
>Robert:
>
>This is where I started to have a problem. Voc is easy, but Isc is more of
a
>breaker response test. Someone must have an interesting procedure for
>powerline impedance testing, maybe defining some time limit.
>
>Ed
>
>
>
>> -----Original Message-----
>> From: Robert Johnson [SMTP:robe...@ma.ultranet.com]
>> Sent: Monday, November 15, 1999 8:10 AM
>> To: "Price,"@ma.ultranet.com
>> Cc: 'emc-p...@ieee.org'
>> Subject: Re: 60 Hz Power Line Impedance
>>
>>
>> Can't you just measure the open circuit voltage and the short circuit
>> current?
>>
>> "Price, Ed" wrote:
>>
>> > As to measuring the AC power source impedance, well, time to go home
>> now!
>> >
>> > 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
>:-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-)
>
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