Accurate 20Hz THD measurement? - Page 2 - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools

Equipment & Tools From test equipment to hand tools

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 22nd March 2009, 05:48 PM   #11
diyAudio Member
 
unclejed613's Avatar
 
Join Date: Dec 2006
glad to be of help..... been using spectrum lab for audio analysis and i've learned a few things...... BTW like the DEVO avatar..... the place i work has an equipment status called DEVO where the equipment is non-serviceable. i use one of their album cover pics as a sticky note for DEVO items.
__________________
Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net
spammer trap: spammers must die
  Reply With Quote
Old 22nd March 2009, 05:58 PM   #12
diyAudio Member
 
unclejed613's Avatar
 
Join Date: Dec 2006
i'd like to get a sound card with a higher sampling rate than 96khz, because there are some uses a sound card can have as a VLF receiver. Spectrum Lab includes some DSP based demodulators and filters and such that can be useful for such an application.... which reminds me, i should check for the latest version....


it's available here:
http://freenet-homepage.de/dl4yhf/spectra1.html
__________________
Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net
spammer trap: spammers must die
  Reply With Quote
Old 22nd March 2009, 06:58 PM   #13
Jeb-D. is offline Jeb-D.  United States
diyAudio Member
 
Jeb-D.'s Avatar
 
Join Date: Nov 2005
Location: SoCal
I'll check it out. I usually use Visual Analyser (yes, they spell it Analyser not Analyzer) which is freeware too. It's pretty lame, but useful and the price is right.

Right now, I'm using an evaluation of Multi-instrument 3.1. It's pretty nifty and has a lot of capabilities, but the user-interface isn't that good. I'm in the process of giving them some feedback how it can be improved. They seem eager to make it as good as they can.

It has a feature called "device test plan", which is pretty much similar to the "sweep" function with an Audio Precision (if your fimiliar). You can setup and run automated frequency and amplitude sweeps while capturing all kinds of data such as THD, THD+N, SNR, IMD, Crosstalk, individual harmonics (2nd-7th), ect. It can create graphs or text data of things like input vs. output amplitude, THD vs. Frequency, THD vs. output level, and so fourth.

I set it up to do an inverse RIAA amplitude + frequency sweep. So when tuning the curve of my phono stage, I just have to try to get the plotted line flat. Makes things much simpler, as I no longer have to compare the amplitude at each frequency to published RIAA curve data every time an adjustment is made.

I'm considering buying it once the evaluation period ends, but may not be able to afford it at this time. So I may need some good freeware till then.
  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
would this be anywhere accurate jamikl Multi-Way 1 21st March 2009 11:12 AM
Accurate DIY Loudspeakers atticus Multi-Way 10 21st September 2004 06:10 PM
How accurate is RMAA distortion measurement? analog_sa Tubes / Valves 20 23rd May 2004 11:25 PM
volume POT...NOT ACCURATE! moonshow Chip Amps 4 22nd March 2004 08:58 PM
Accurate weights for speaker Vas measurement Circlotron Multi-Way 9 30th December 2002 11:41 PM


New To Site? Need Help?

All times are GMT. The time now is 09:33 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