LIMP bug?

crazyhub · 6th September 2009, 09:59 PM

Hi!

I presently began to perform some T/S parameters measurements with the added mass method in LIMP. I just found that "Le" value in the exported CVS file is quite different than what I can read in the result window

; did anyone remark the same thing?
Thanks

David_Web · 16th September 2009, 02:32 PM

Happens to me as well. Not sure why though.

You could check the correct value with the RCL sampling tool as I have found it correct with many components from resistors to caps and inductors. 1k would probably be good as most mfgrs spec at that frequency.

crazyhub · 16th September 2009, 04:43 PM

Hi David,

Yes it's a bug, in any case confirmed by another french user of LIMP.

BTW, on my W5-876SA Tang-Band woofer I measured 2.06mH with my selfmeter, so approx. near 1Khz.
The T/S calculator in LIMP gave me Le = 4.61mH, same value with or without an added mass.
And I read 2.6mH at 1Khz on the inductive impedance curve with the LIMP RLC tool...

So quite different values...As I read it sometimes, it seems that at least some T/S parameters are difficult to catch!

Cheers,

Hubert

6th September 2009, 09:59 PM	#1
crazyhub diyAudio Member Join Date: Nov 2005 Location: alsace	LIMP bug? Hi! I presently began to perform some T/S parameters measurements with the added mass method in LIMP. I just found that "Le" value in the exported CVS file is quite different than what I can read in the result window; did anyone remark the same thing? Thanks __________________ crazyhub

16th September 2009, 04:43 PM	#3
crazyhub diyAudio Member Join Date: Nov 2005 Location: alsace	Hi David, Yes it's a bug, in any case confirmed by another french user of LIMP. BTW, on my W5-876SA Tang-Band woofer I measured 2.06mH with my selfmeter, so approx. near 1Khz. The T/S calculator in LIMP gave me Le = 4.61mH, same value with or without an added mass. And I read 2.6mH at 1Khz on the inductive impedance curve with the LIMP RLC tool... So quite different values...As I read it sometimes, it seems that at least some T/S parameters are difficult to catch! Cheers, Hubert __________________ crazyhub

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16th September 2009, 02:32 PM	#2
David_Web diyAudio Member Join Date: Sep 2008	Happens to me as well. Not sure why though. You could check the correct value with the RCL sampling tool as I have found it correct with many components from resistors to caps and inductors. 1k would probably be good as most mfgrs spec at that frequency.