UCA202 Confusion!! - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 23 Old 11-02-11, 08:34 PM Thread Starter
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UCA202 Confusion!!

Trying to calibrate a Vista Dell Laptop. Cannot find any audio mixer controls. I get this graph and lots of errors. The RS meter is not connected at all. Is that correct?

Frustrated I cannot figure this out after reading the UCA thread.
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post #2 of 23 Old 11-03-11, 06:51 AM Thread Starter
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Re: UCA202 Confusion!!

I am assuming this is the same thing but this instruction means nothing to me. I assumed somebody would have given me some advice by now?

"If the measurement looks like this:
Bad soundcard calibration result

it is probably due to a feedback loop from the Line In to the output. This can happen if the soundcard has some feature for record monitoring - for example, on the Soundblaster Live 24-bit External there is a "Monitor" feature for the Line In that must be turned off to get correct results, on some other Creative soundcards (e.g. Audigy 2 ZS) there is a Record Advanced Controls setting for "Record without monitoring" that must be selected. It can also happen if "Line In" is not muted in the Playback mixer for the soundcard."
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post #3 of 23 Old 11-03-11, 07:13 AM Thread Starter
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Re: UCA202 Confusion!!

This instruction seems contradictory. Do I loop the right to right when checking the Loopback button or left to left?

"Input Channel
REW only uses one soundcard channel to capture the output of your SPL meter or mic preamp, the Input Channel control tells REW which channel you have connected to. The default is the Right channel. If Use Loopback as Timing Reference has been selected in the Analysis Preferences the other channel will be used a reference to eliminate time delays within the computer and soundcard, this requires a loopback connection on the reference channel. If the soundcard (or something else in the input chain) inverts its input select the Invert checkbox to restore correct polarity. If the input has a DC offset check the High Pass box to have REW automatically apply a 2Hz high pass filter. "
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post #4 of 23 Old 11-03-11, 07:19 AM Thread Starter
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Re: UCA202 Confusion!!

Do I click this box for my old RS meter when doing the calibration? Or after the calibration is finished?

"Mic/Meter Preferences

The Mic/Meter Preferences allow selection of the Mic/Meter type, loading/clearing of a mic/meter calibration file to use for new measurements and calibrating the REW SPL meter's SPL reading.

Mic/Meter Preferences

Type

Select the C Weighted SPL Meter check box if you are using a C weighted SPL meter as the input to REW, subsequent measurements will then be corrected to remove the low and high frequency roll-offs of the C weighting characteristic. If a cal file is loaded the correction will only be applied outside the frequency range covered by the cal file. "
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post #5 of 23 Old 11-03-11, 05:05 PM
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Re: UCA202 Confusion!!

The graph you posted is the Scope plot, it shows the time signal that was captured so it is correct for it to have roughly that appearance. To examine the response use the SPL & Phase plot.
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post #6 of 23 Old 11-03-11, 05:06 PM
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Re: UCA202 Confusion!!

Quote:
Big Red Machine wrote: View Post
This instruction seems contradictory. Do I loop the right to right when checking the Loopback button or left to left?
You are calibrating the channel you will be measuring with, normally that is the Right channel.
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post #7 of 23 Old 11-03-11, 05:07 PM
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Re: UCA202 Confusion!!

Quote:
Big Red Machine wrote: View Post
Do I click this box for my old RS meter when doing the calibration? Or after the calibration is finished?
After the soundcard calibration is finished, it is not needed until you connect the RS meter.
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post #8 of 23 Old 11-03-11, 05:50 PM Thread Starter
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Re: UCA202 Confusion!!

I have the right input and right output connected and no other connections except the USB to the laptop. The Monitor switch is off and the green light is on.

I get this when calibrating:
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UCA202 Confusion!!-uca202-2nd-try.jpg  

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post #9 of 23 Old 11-03-11, 06:03 PM Thread Starter
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Re: UCA202 Confusion!!

See anything wacky here?
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post #10 of 23 Old 11-03-11, 06:17 PM Thread Starter
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Re: UCA202 Confusion!!

I changed the buffer to 64k and looky-here. Now what the do I do?
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