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BIII Right ouput louder than left output - Right ouput louder than left output Options  Watch this topic  Print this topic  Atom Feed  RSS Feed View » Normal Threaded

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felipe		#41 Posted : Monday, December 3, 2012 8:18:36 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		Also ribbon cable between Sidecar & B3_S/PDIF_4 connected.
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felipe		#42 Posted : Monday, December 3, 2012 8:24:23 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		Originally Posted by: Russ White What voltages do both sides of your AVCC module output measure? Near QP1 3.552VDC Near QP2 3.544VDC
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felipe		#43 Posted : Monday, December 3, 2012 8:31:01 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		Originally Posted by: Russ White The sidecar would need to be powered for the relays to engage. DAC powered jpcm1 & jpcm2 both 47k jpcm3 open (DVM can't measure resistance) Edited by user Monday, December 3, 2012 8:45:04 PM(UTC)  | Reason: Not specified
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felipe		#44 Posted : Monday, December 3, 2012 8:55:41 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		Always Legato not connected.
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felipe		#45 Posted : Tuesday, December 4, 2012 1:59:59 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		Any other measurements or ideas to fix the issue?
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Brian Donegan		#46 Posted : Tuesday, December 4, 2012 5:27:28 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 2,868 Location: Massachusetts, USA Thanks: 2 times Was thanked: 141 time(s) in 134 post(s)		Originally Posted by: felipe Originally Posted by: Russ White The sidecar would need to be powered for the relays to engage. DAC powered jpcm1 & jpcm2 both 47k jpcm3 open (DVM can't measure resistance) Can you test these values with the DAC not powered? Please list the measured values with and without the Sidecar attached.
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felipe		#47 Posted : Tuesday, December 4, 2012 5:46:26 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		DAC not powered With Sidecar jpcm1 69.6k jpcm2 93.3k jpcm3 70.3k Without Sidecar jpcm1 94.1k jpcm2 93.9k jpcm3 93.83k
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Russ White		#48 Posted : Tuesday, December 4, 2012 7:02:13 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 3,979 Location: Nashville, TN Thanks: 25 times Was thanked: 89 time(s) in 83 post(s)		When you went directly out from the DAC were the channels equal? Try disconnecting the legato, then load each output with a low value resistor (equal values at each) to GND. 10-100R should be fine. Then measure the output of each side (left and right). Edited by user Tuesday, December 4, 2012 7:04:18 PM(UTC)  | Reason: Not specified
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felipe		#49 Posted : Tuesday, December 4, 2012 7:49:51 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		Originally Posted by: Russ White When you went directly out from the DAC were the channels equal? NO Try disconnecting the legato, then load each output with a low value resistor (equal values at each) to GND. 10-100R should be fine. Then measure the output of each side (left and right). With signal 1kHz -3dB FS? Edited by user Tuesday, December 4, 2012 7:50:46 PM(UTC)  | Reason: Not specified
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felipe		#50 Posted : Tuesday, December 4, 2012 8:49:53 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		Used 4 resistors 100 ohms each. measurements are across each resistor Right channel Cold phase without signal 0.019VAC with signal 0.020VAC Hot phase without signal 0.019VAC with signal 0.020VAC Left channel Cold phase without signal between 0.017-0.021VAC with signal 0.019VAC Hot phase without signal 0.018VAC with signal between 0.018-0.019VAC
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Russ White		#51 Posted : Tuesday, December 4, 2012 10:37:17 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 3,979 Location: Nashville, TN Thanks: 25 times Was thanked: 89 time(s) in 83 post(s)		It makes no sense that there would be an AC voltage with no signal... What are you doing measurements with?
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felipe		#52 Posted : Wednesday, December 5, 2012 11:34:14 AM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		These are the measurements with & without 1kHz sinus wave -3dB FS Originally Posted by: felipe Used 4 resistors 100 ohms each. measurements are across each resistor Right channel Cold phase without signal 0.019VAC with signal 0.020VAC Hot phase without signal 0.019VAC with signal 0.020VAC Left channel Cold phase without signal between 0.017-0.021VAC with signal 0.019VAC Hot phase without signal 0.018VAC with signal between 0.018-0.019VAC I do the measurements with a true RMS DVM.
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felipe		#53 Posted : Wednesday, December 5, 2012 1:36:15 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		What measurements are the right to be measured across the 100 ohms resistors?
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Russ White		#54 Posted : Wednesday, December 5, 2012 3:14:24 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 3,979 Location: Nashville, TN Thanks: 25 times Was thanked: 89 time(s) in 83 post(s)		You can't really use most DMMs like that. Even a very basic PC based oscilloscope would be much better. With no signal you should see no AC voltage at the outputs. With a signal it should be a small but equal signal when loaded with 100R something ~500mv maybe a bit more.
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felipe		#55 Posted : Wednesday, December 5, 2012 3:17:53 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		I measured before with my DVM the DAC ESS9023 & measured 2.17VAC at the output using the same signal generator. If you want I use my scope & post the shoots pics?
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felipe		#56 Posted : Wednesday, December 5, 2012 3:38:34 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		Each of all four phases scope set 0.2V/cm 0.5ms shows the same square wave 1kHz -3dB http://img23.imageshack....mg23/3856/dsc00059ow.jpg Edited by user Wednesday, December 5, 2012 3:40:01 PM(UTC)  | Reason: Not specified
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felipe		#57 Posted : Wednesday, December 5, 2012 3:45:04 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		Now mute LED always don't lit: with or without signal, checked with the scope.
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felipe		#58 Posted : Wednesday, December 5, 2012 3:46:12 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		When I disconnect the USB cable the mute LED lits.
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Russ White		#59 Posted : Wednesday, December 5, 2012 5:19:39 PM(UTC)
Rank: Administration Groups: Administration, Customer Joined: 10/24/2006(UTC) Posts: 3,979 Location: Nashville, TN Thanks: 25 times Was thanked: 89 time(s) in 83 post(s)		Are you playing a 1Khz square wave?
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felipe		#60 Posted : Wednesday, December 5, 2012 7:35:16 PM(UTC)
Rank: Member Groups: Member Joined: 12/6/2009(UTC) Posts: 323 Location: Catalonia new Europe state Thanks: 4 times Was thanked: 1 time(s) in 1 post(s)		Yes.
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