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I failed in impeadance measurement.
To measure impedance, I made my impedance jig as the schematic shown in Getting Started article. Then I tried to measure my woofer's impedance using UA-1EX audio interface.
But I failed. The measurement results seem uncorrect. The impedance cove seems upside downed. See attched image. So I checked the jig and interface connection, it seems no preblem.
I'm connecting audio-inteface output to jig input(described in the schematic shown in Getting Started article. ), jig output to audio-inteface input.
Am I taking wrong setting?
When clicking "Capture Resistor" there is the wondow asking "Ressistor Value". What does value meen. The speakers DC Resistance or the resistor resistance value in the jig?
But I failed. The measurement results seem uncorrect. The impedance cove seems upside downed. See attched image. So I checked the jig and interface connection, it seems no preblem.
I'm connecting audio-inteface output to jig input(described in the schematic shown in Getting Started article. ), jig output to audio-inteface input.
Am I taking wrong setting?
When clicking "Capture Resistor" there is the wondow asking "Ressistor Value". What does value meen. The speakers DC Resistance or the resistor resistance value in the jig?
I’m sad.
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Inappropriate?You're supposed to measure the calibration resistor in the jig first, taking care to note the value of that resistor (I like to title the measurement record with the resistor info).
Then, when that measurement is highlighted in the main document, use the 'Capture Resistor' button to capture that record as the resistor measurement, and then enter the value of that resistor in that box.
From there, you select the woofer measurement, and then use the 'Model Fit' button to get your TS parameters. -
Inappropriate?Thanks Chris for quick response.
I found I was totally misunderstood for the impedance measurement.
To measure the impedance, Should I have to measure the wave in the main document before measure the impedance?
I wana make sure "enter the value of that resistor in that box" .
The value of that resistor meens value of the impedance jig's resistor?
My jig's resistance was 999 ohm.
I’m silly.
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Inappropriate?Hi Jammer,
I see we are using the same audio interface. Are you able to get loopback to work properly? You will see my continuing problem in a previous unresolved thread.4 Comments
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This answers the question
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Just FYI, loopback/correction are not really necessary for impedance measurements. Because they reference the measurement of the resistor, that works the same as a loopback measured through the jig.
Not that the autocorrection process will mess with the process, but it's just an extra step/setup you don't have to worry about. -
I am not asking about loopback with regards to impedance measurement. I am looking for Jammer's results with the Edirol device in microphone testing and loopback correction.
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Alright. Just thought I'd put it out there so you (and others that might stumble on this thread in the future) would be aware...
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Hi luxohifi,
I put my Auto-Corrected measurement result in new topic as "Automatic Correction". -
Inappropriate?Yes. The measurements all have to happen in the main document. The impedance (and other plugins) operate on the records in the main document.
I don't mean the resistor in the impedance jig, which is 1K. I mean, you take a resistor that's close to the DC resistance of the loudspeaker (around 8 or 10 ohms will do) and place that on the terminals of the jig as if it were a speaker.
Then, you measure the jig loaded with the 'calibration resistor', measure again with the speaker attached to the terminals. Finally, you refer to the calibration resistor measurement and enter its value (8 or 10 ohms as above, and not the 10k resistor in the jig), and then select the speaker measurement in the main document and then model fit with that.1 Comment Add a comment
This answers the question
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Hi Chris,
Okey I understood. I'll try again later. Thank you. -
Inappropriate?Hi Chris
Finally I succeeded the impedance measuements.
Thanks.
I think it was a littel bit difficult to understand how to use for non-English people like me.
So I opened a FuzzMeasure Japanese Site. It is describing the usage guidance in Japanese.
If you find a Japanese user please let him know the following URL.
http://web.mac.com/jammer5/Audio%26Ma...
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