Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 13th June 2010, 06:32 AM   #1
ygg-it is offline ygg-it  Italy
diyAudio Member
 
Join Date: Feb 2008
Default OT: how can I measure THD of my amplifier if my sound card is 0,02% THD ?

Hello my sound card has a 0,02% THD+NOISE itself. (3rd harmonic)

It seems low but I have to measure my amplifier THD.

My amplifier measure is 0,022%...

Is there a way to get my amplifier THD+noise?

Can I subtract the two at each harmonic?
  Reply With Quote
Old 13th June 2010, 07:54 AM   #2
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour, on the east coast
Sadly, no.

Assuming you obtained .022% distortion figure using this sound card, you can only say that it is in same order or less distortion than the sound card. You need a sound card with wide bandwidth, like 24 bit 192 kHz sample rate and distortion <,= 0.001% for useful THD estimates.

If you only need to measure at 1 kHz, then a good quality 16 bit card specified to 20 kHz will do. Even older genuine Creative cards like Live or Vibra 16 were low noise and fair on THD. Generic and clone cards usually do not give original performance on noise or THD. Second hand or swap of these from old computers is sometimes fine if you have the genuine part with specs. that suit this task.

I hope this is helpful to you. Happy hunting.
__________________
regards
  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
THD Noticable? form109 Solid State 4 29th March 2010 10:44 PM
Blameless THD nicholas1113 Solid State 12 18th January 2010 11:22 AM
Measure THD, etc of power amp with sound card - attenuator? CBRworm Solid State 36 18th September 2009 05:55 AM
Help! Thd + N. mgm2000ro Solid State 5 1st June 2006 12:19 AM
first THD measurements Pierre Class D 17 7th June 2005 07:18 PM


New To Site? Need Help?

All times are GMT. The time now is 02:24 AM.


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