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November 25, 2020, 03:05:37 AM

Author Topic: Measuring TS Parameters  (Read 183 times)

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Offline Jamier

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Measuring TS Parameters
« on: November 19, 2020, 10:47:46 AM »
I want to measure some TS parameters but I don't have an Audio Signal Generator. Will a laptop and an online tone generator suffice, or will this be inaccurate? If it will work, can I take the signal from the headphone jack of the computer or should I put it through a DAC and then to the amplified part of the setup? I intend to use the setup described by Rod Elliot.

Jamie
James Robbins

Offline Paul Birkeland

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Re: Measuring TS Parameters
« Reply #1 on: November 19, 2020, 02:05:47 PM »
I would get a USB tester dedicated to doing this.  They aren't all that expensive, and they work really well.
Paul "PB" Birkeland

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Offline Jamier

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Re: Measuring TS Parameters
« Reply #2 on: November 19, 2020, 02:58:41 PM »
PB, can you give me a link to an example.

Jamie
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Offline Jay

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Offline mcandmar

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Re: Measuring TS Parameters
« Reply #4 on: November 20, 2020, 12:21:34 AM »
What are TS parameters?    ....its probobly obvious but i cant figure it out.

A sound card output is ferectly fine if you just need a line level source to create test tones.  Its only when you want to measure a signal coming back that needs dedicated hardware, especially for speaker level signals.

I built one of these which sits between my sound card line input and the device under test http://www.pmillett.com/ATEST.htm ...but admitantly its not a cheap solution.  An external sound card inferace would be the better bang for your buck.
M.McCandless

Offline Paul Birkeland

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Re: Measuring TS Parameters
« Reply #5 on: November 20, 2020, 04:54:14 AM »
Paul "PB" Birkeland

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Offline Jamier

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Re: Measuring TS Parameters
« Reply #6 on: November 20, 2020, 11:38:48 AM »
Mark, it's the Thiele-Small speaker parameters. Jay and PB thanks for the links, problem is they require a PC and I have a MAC. By the time I invest in the PC and the DATS or whatever, I'm as much in as If I bought a Clio system, which at this point, might make more sense.

Jamie
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Offline Jay

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Re: Measuring TS Parameters
« Reply #7 on: November 20, 2020, 11:39:27 AM »
TS parameters = Thiele/Small parameters.  See https://en.wikipedia.org/wiki/Thiele/Small_parameters
Jay L.

Offline Paul Joppa

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Re: Measuring TS Parameters
« Reply #8 on: November 20, 2020, 12:03:04 PM »
I want to measure some TS parameters but I don't have an Audio Signal Generator. Will a laptop and an online tone generator suffice, or will this be inaccurate? If it will work, can I take the signal from the headphone jack of the computer or should I put it through a DAC and then to the amplified part of the setup? I intend to use the setup described by Rod Elliot.

Jamie
It can be done - I did it that way for years. It's fairly labor intensive...  :^)  I don't know what Rod Elliot's method is, so I can't say if that's the way to do it.
Paul Joppa

Offline Paul Birkeland

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Re: Measuring TS Parameters
« Reply #9 on: November 20, 2020, 03:06:24 PM »
These USB woofer testing devices will run on ancient Windows machines.  If you have an electronics recycler around, I'm sure they have some $100 laptops.
Paul "PB" Birkeland

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Offline Jamier

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Re: Measuring TS Parameters
« Reply #10 on: November 21, 2020, 03:39:20 AM »
In the measurement setup described by Rod Elliot, he mentions that is important to have a voltmeter that is accurate when measuring above 1-2 KHz. How will I know if mine isn’t?

Jamie
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Offline Paul Joppa

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Re: Measuring TS Parameters
« Reply #11 on: November 21, 2020, 04:38:23 AM »
In the measurement setup described by Rod Elliot, he mentions that is important to have a voltmeter that is accurate when measuring above 1-2 KHz. How will I know if mine isn’t?

Jamie
Connect your meter to comptuer and use an online tone generator at various frequencies.
Paul Joppa

Offline Jamier

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Re: Measuring TS Parameters
« Reply #12 on: November 21, 2020, 05:06:33 AM »
PI, thanks. Now I see that I have a meter that will measure freq. I will check that meter against the tone generator. If they don’t agree at a particular freq. I guess I will have to make a choice as to which one I trust.

Jamie
James Robbins