Measuring AD1865 DAC2 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 17th November 2010, 02:41 AM   #1
diyAudio Member
 
Join Date: Nov 2009
Location: Vienna
Default Measuring AD1865 DAC2

Dear All,

I have a new measuring toy (Picotech 4424), and I am doing some measures on my gears. Main purpose is to lear how to use the instrument, understand results and put a baseline for further development.

I started measuring signals out of my MAC PRO and I measure the DAC2 designed by Quanchao.

On the latter I got some strange/interesting results. DAC has been fed both with the digital output of the laptop and with the M2Tech Iface, with no measurable difference. For the pictures I used the Iface.

Please see the images attached:
1) The first image is the FFT with no SPDIF connected. Wondering what that bomps are, but this can be not relevant
2) Second picture is a 1kHz signal 44.1 kHz. There are so many odd harmonics, but the measured THD is not so bad.
3) Third picture is the same signal with 96 kHz. The FFT looks much better, but the value of the THD is almose one order of magnitude more.
4) The last picture is a 1kHz square wave. This is where the DAC performs very well. If compared to the analog output of the MAC it is perfetc, while the MAC was showing very evident symmetric ringing.

Any comment ?

One question: for IMD I think I have to feed two signals. What are good frequencies to use ?

Additionally, I noted that the signal generator software really matters. I tries Tongen and SignalSuite. The latter is much more accurate in term of THD.

Best Regards,

Davide
Attached Images
File Type: jpg nosignalad.JPG (117.4 KB, 186 views)
File Type: jpg 44ad.JPG (123.1 KB, 187 views)
File Type: jpg 96ad.JPG (124.6 KB, 179 views)
File Type: jpg squareadmac.JPG (53.4 KB, 172 views)
  Reply With Quote
Old 18th November 2010, 06:15 AM   #2
diyAudio Member
 
Join Date: Nov 2009
Location: Vienna
No input on this ? :-(

D.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need help to make Magic Dac2 work!! atcgreg Digital Line Level 2 5th May 2009 12:04 PM
WBT: Bel Canto DAC2 iwok Swap Meet 0 31st January 2008 03:42 PM
FS: Bel Canto DAC2 mourip Swap Meet 2 7th April 2007 03:35 AM
Audio Note DAC2 memorylane Digital Source 1 3rd October 2006 07:36 PM
Bel Canto Dac2 I/V stage ftorres Digital Source 2 20th September 2004 09:59 PM


New To Site? Need Help?

All times are GMT. The time now is 02:50 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2