Distortion analyzer recommandations?

tschrama · 9th June 2008, 02:44 PM

Hi all,

I'm still obsessed with making precise THD measurements..so here goes:

What would you recommend?

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA:IT&ih=008

or

amber 5500

or should I be just happy with a cheaper HP339?

Conrad Hoffman · 10th June 2008, 05:01 AM

IMO, there's no such thing as a precise THD measurement. The more you make, the more you'll realize this. Low noise and distortion floor is important. If you design amps using Doug Self's principles, few analyzers will be good enough alone to see what you're doing. I don't know much about the units you're looking at- check the specs to see what they can do. The prices seem reasonable if they actually sell for near that. If you want a challenging project, the Bob Cordell analyzer on his site is hard to beat. That's what I've been using for years. Or, just use a 339 and team it up with a PC based spectrum analyzer. There was a large message thread on this topic within the last few weeks you might search for.

jonathen · 10th June 2008, 07:37 AM

I think, Conrad suggested you the right thing. Instead of going for other one's, the best thing is to use your HP339 with spectrum analyzer.

tschrama · 10th June 2008, 07:47 AM

Thanks for the advice. I am going to for the 339 to PC spectrum then!

grtz, Thijs

9th June 2008, 02:44 PM	#1
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	Distortion analyzer recommandations? Hi all, I'm still obsessed with making precise THD measurements..so here goes: What would you recommend? http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA:IT&ih=008 or amber 5500 or should I be just happy with a cheaper HP339?

10th June 2008, 05:01 AM	#2
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	IMO, there's no such thing as a precise THD measurement. The more you make, the more you'll realize this. Low noise and distortion floor is important. If you design amps using Doug Self's principles, few analyzers will be good enough alone to see what you're doing. I don't know much about the units you're looking at- check the specs to see what they can do. The prices seem reasonable if they actually sell for near that. If you want a challenging project, the Bob Cordell analyzer on his site is hard to beat. That's what I've been using for years. Or, just use a 339 and team it up with a PC based spectrum analyzer. There was a large message thread on this topic within the last few weeks you might search for. __________________ I used to be an audiophool like you but then I took an arrow to the knee.

10th June 2008, 07:37 AM	#3
jonathen diyAudio Member Join Date: May 2008	I think, Conrad suggested you the right thing. Instead of going for other one's, the best thing is to use your HP339 with spectrum analyzer. __________________ http://swpc.co.il/

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10th June 2008, 07:47 AM	#4
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	Thanks for the advice. I am going to for the 339 to PC spectrum then! grtz, Thijs

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