Muriel,
The usual method of measuring the impedance of a component is to insert a
non-inductive resistor in series with the component and measure V1 vs. V2,
where V1 is the voltage across the resistor and V2 is the voltage across the
component under test. At any frequency, the voltage ratio will be determined
by the reactance of the component. A vector impedance meter or differential
input oscilloscope is normally used. An ordinary oscilloscope and probe may
be used in a pinch, by measuring Vt (V total) vs. V2. What you do is connect
one probe, with the ground lead at the circuit return, and move the probe
from Node 1 to Node 2, measuring and recording the peak values at each
frequency. Node 1 is the point where the signal source connects to the
resistor, Node 2 is the junction of the resistor and component, and Node 0
is the point where the component connects to the signal source return. One
probe is used to eliminate the errors caused by non-matched probes.
It is possible to determine inductance or capacitance by working the
reactance formulas backwards.
Scott Lacey
-----Original Message-----
From: Muriel Bittencourt de Liz [SMTP:mur...@grucad.ufsc.br]
Sent: Friday, November 12, 1999 4:52 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
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