Reactive Load Tests? - Page 2 - diyAudio
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 23rd November 2011, 06:39 PM   #11
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
About a year ago I took the model from Bob Cordell's book "Designing Audio Power Amplifiers" (page 462 I think) and ran some impedance tests -- looks like it should:

Click the image to open in full size.
  Reply With Quote
Old 24th November 2011, 09:25 AM   #12
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Another post with an off site automatic download.
And it got stuck.
Won't complete the download and won't expand the download.

Edit: after 2minutes delay, it finally completed the auto download.
__________________
regards Andrew T.
  Reply With Quote
Old 24th November 2011, 09:30 AM   #13
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
it took 10 seconds to download http://www.audiograph.se/Downloads/P...e_complete.pdf in my computer......
  Reply With Quote
Old 24th November 2011, 11:09 AM   #14
diyAudio Member
 
Join Date: Mar 2010
in the 90'ties

I ran many, many tests on AudioGraph's Power-Cube system, and it is an excellent system that allow you to evaluate any amplifiers ablity to handle reactive loads and to deliver lot's of current. We created a very comprehensive library of measurements on hundreds of amplifiers at that time.
I do not know how it is today, but back then the load-box switched through a number of combinations of resistors, inductors and capacitors in order to create the reactive loads with phase-angle of 0, +-30 deg and +-60 deg.
It measured the amplifier distortion in order to establish amplifier clipping, using a high-speed fft, and finally it measured the high current capability by loading the amplifier with 0,1 ohm, using a short burst. And if the amp went into oscillation during the test it reported that and abandoned the test.

Beautifull stuff! Everybody should have one. Not everybody can afford it. it was $20K back then, probably not less today.

Steen
  Reply With Quote
Old 24th November 2011, 02:46 PM   #15
diyAudio Member
 
EnvisionAudio's Avatar
 
Join Date: Apr 2002
Location: Dayton, OH
Quote:
Originally Posted by smichael View Post
in the 90'ties

I ran many, many tests on AudioGraph's Power-Cube system, and it is an excellent system that allow you to evaluate any amplifiers ablity to handle reactive loads and to deliver lot's of current. We created a very comprehensive library of measurements on hundreds of amplifiers at that time.
I do not know how it is today, but back then the load-box switched through a number of combinations of resistors, inductors and capacitors in order to create the reactive loads with phase-angle of 0, +-30 deg and +-60 deg.
It measured the amplifier distortion in order to establish amplifier clipping, using a high-speed fft, and finally it measured the high current capability by loading the amplifier with 0,1 ohm, using a short burst. And if the amp went into oscillation during the test it reported that and abandoned the test.

Beautifull stuff! Everybody should have one. Not everybody can afford it. it was $20K back then, probably not less today.

Steen
Right. I have since figured it out and developed my own (but have not built it). It would cost about $3k and require some DAQ cards for a PC. The cheap version would be controlled using some relays and require manual interaction. However, I am less inclined to do this because I feel anything less than fully automated operation could result in damage if something went wrong.
__________________
DCX2496/DEQ2496 Car Audio Conversions
www.envisionelec.net
  Reply With Quote
Old 24th November 2011, 02:51 PM   #16
diyAudio Member
 
dirkwright's Avatar
 
Join Date: May 2011
Location: Virginia
Quote:
Originally Posted by EnvisionAudio View Post
Right. I have since figured it out and developed my own (but have not built it). It would cost about $3k and require some DAQ cards for a PC. The cheap version would be controlled using some relays and require manual interaction. However, I am less inclined to do this because I feel anything less than fully automated operation could result in damage if something went wrong.
Well, that's what fuses are for... <j/k>

I'd settle for a load box full of resistors, capacitors and inductors with manual switches therebetween. Maybe a fancy version would have an ammeter and voltmeter on it...
  Reply With Quote
Old 27th November 2011, 03:22 PM   #17
diyAudio Member
 
Speedskater's Avatar
 
Join Date: Sep 2002
Location: Lakewood, Ohio
The "Audio Critic" magazine has been using the Power Cube tester since 1993.

http://www.theaudiocritic.com/back_i...ritic_20_r.pdf
__________________
Kevin
  Reply With Quote
Old 27th November 2011, 04:44 PM   #18
diyAudio Member
 
dirkwright's Avatar
 
Join Date: May 2011
Location: Virginia
Quote:
Originally Posted by Speedskater View Post
The "Audio Critic" magazine has been using the Power Cube tester since 1993.

http://www.theaudiocritic.com/back_i...ritic_20_r.pdf
Yeah, it's a really good test. He does have an axe to grind though...
  Reply With Quote
Old 28th November 2011, 12:59 AM   #19
a.wayne is offline a.wayne  United States
diyAudio Member
 
a.wayne's Avatar
 
Join Date: May 2008
Location: Front Row Center
If all true and worthwhile testing ......... Tubes ? not a test makes .....
  Reply With Quote
Old 28th November 2011, 04:35 AM   #20
a.wayne is offline a.wayne  United States
diyAudio Member
 
a.wayne's Avatar
 
Join Date: May 2008
Location: Front Row Center
Quote:
Originally Posted by dirkwright View Post
Yeah, it's a really good test. He does have an axe to grind though...
Like everything else in life ,you dont have to agree with it all, aside, i do enjoy it when they expose the poser's ..


  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
Power load, dummy load (pic) luka Power Supplies 43 9th February 2012 02:50 PM
Dynamic load line analysis using music and speaker load Michael Koster Tubes / Valves 0 7th March 2008 08:47 PM
amplifier reactive load testing d3imlay Solid State 3 21st February 2008 02:41 PM
First tests with my 5ch GC Mika Chip Amps 39 24th November 2003 01:05 PM


New To Site? Need Help?

All times are GMT. The time now is 05:43 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