Can you measure Impedance with an Ohm Meter..

Is it possible to measure Impedance with an ohm meter.
For example can you measure the Impedance of a 4 ohm
car speaker with an ohm meter?

When I tell people they cannot measure Impedance with an
ohm meter, you need an impedance meter and the impedance
must be measured with the speaker in operation, with a signal generator
supplying a fixed frequency, this always leads to disagreements
with the person who demands an ohm meter to measure what he calls
Impedance, when I tell him an ohm meter can only measure the resistance
of the coil there is always disagreement.

I tell them Impedance is AC resistance and what they measure
with an ohm meter is DC resistance. Disagreement here again.

Will somebody take me up on this and clarify the situation.

Thanks in advance
Denny B

"Denny B" wrote in message
news
Is it possible to measure Impedance with an ohm meter.

No, not on it's own.


[snip]

When I tell people they cannot measure Impedance with an
ohm meter, you need an impedance meter and the impedance
must be measured with the speaker in operation, with a signal generator
supplying a fixed frequency, this always leads to disagreements

I would think so, at that point you are oth incorrect, the speaker impedance
will be frequency dependant.
The impedance quoted in the specs is usually the minimum.
Which as your opponents claim, maybe near to the DC resistance. Due to the
fact that at resonance the inductive and capacitive reactances almost cancel
each other out.

On Thu, 17 Jul 2003 06:22:58 +0000 (UTC), "Avanti"
wrote:

The impedance quoted in the specs is usually the minimum.
Which as your opponents claim, maybe near to the DC resistance.

At the same time, the peak impedance may be substantially higher at
certain frequencies, which can cause some pretty major problems with
the response curve from the system.

Jon
--
In-Car Express http://www.incarexpress.co.uk
Car Audio | Security | Multimedia | Navigation
Tel. 01223 301212 Fax. 0870 7484 123