Dummy Load resistors

JOE DIRT® · 3rd June 2003, 01:34 PM

Now these are what I call Dummy Load Resistors.LOL....they are Dale 8 ohm 225 watt

jmateus · 3rd June 2003, 02:41 PM

Are they inductive?
I have a pair of similar ones and I can't use them because of
that... They are very unreliable as far as readings on the scope,
they present an inductive load to an amplifier and the waveforms
are unpredictable and not truthful.

Fusor · 3rd June 2003, 03:12 PM

I have their little brothers.
These Dales are 100 watt 16 ohm.
Got them for a future Son of Zen.

dhaen · 3rd June 2003, 03:50 PM

Quote:

Are they inductive?

How much inductance are we talking about here?
A piece of wire has inductance.

I can't imagine any problem within the audio band: Unless you put a core, such as a fixing stud through the middle.

Cheers,

Da5id4Vz · 3rd June 2003, 04:28 PM

But most speakers present an inductive load too.

So is the issue with non-inductive dummy loads is to be able to take accurate output readings?

If this is the case, are inductive dummy loads OK if you are just trying to run an amp at power without endangering your speakers and deafening the neighbors?

thylantyr · 3rd June 2003, 10:48 PM

Get some nichrome wire - heating element cores
for home dryers.... stretch the windings for non inductive.
hehehehe

L Daniel Rosa · 4th June 2003, 03:15 PM

"But most speakers present an inductive load too. "

That's true, but it's easier to add inductance to a non-inductive dummy load than to counter it in a reactive one.

3rd June 2003, 02:41 PM	#2
jmateus diyAudio Member Join Date: Mar 2003 Location: US, New Jersey	Load resistors Are they inductive? I have a pair of similar ones and I can't use them because of that... They are very unreliable as far as readings on the scope, they present an inductive load to an amplifier and the waveforms are unpredictable and not truthful. __________________ JLH 2005, Cyrus and so on...

3rd June 2003, 04:28 PM	#5
Da5id4Vz diyAudio Member Join Date: Feb 2003 Location: lost in america...	Non Inductive Speakers? But most speakers present an inductive load too. So is the issue with non-inductive dummy loads is to be able to take accurate output readings? If this is the case, are inductive dummy loads OK if you are just trying to run an amp at power without endangering your speakers and deafening the neighbors?

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3rd June 2003, 10:48 PM	#6
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	Get some nichrome wire - heating element cores for home dryers.... stretch the windings for non inductive. hehehehe

4th June 2003, 03:15 PM	#7
L Daniel Rosa diyAudio Member Join Date: Jun 2002 Location: Bellingham WA	"But most speakers present an inductive load too. " That's true, but it's easier to add inductance to a non-inductive dummy load than to counter it in a reactive one.

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