LIMP measurements WAYYY too high

tuxedocivic · 26th May 2011, 04:00 AM

Hey all,

Hopefully this is an easy fix. I made a jig like the one here: Measuring Frequency Response Using ARTA

I'm using a 16.4 ohm resistor (well, 2 8.2 ohms in series), and I get this:

50 ohms minimum and almost 2000 ohms at Fs!!! I've adjusted the reference resistor setting up and down with no change. Is there a setting I'm missing? Any help is appreciated.

tuxedocivic · 27th May 2011, 09:15 PM

Any help is very much appreciated

Henry8 · 28th May 2011, 11:16 AM

i dont use this software, but your ref R and dut should form a voltage divider, then the software measures the v arcoss you dut and calcs imp.
Check your connections etc, software setup etc.
Use a 10R etc instead of a speaker for now, when everything is ok it should measure 10R at 0deg across your set freq range. Then you can test a driver knowing your setp is ok.

tuxedocivic · 6th June 2011, 08:00 PM

For people in the future, it was my input on my computer. I used mic. Now it's in Line in and it works. Thanks Henry.

26th May 2011, 04:00 AM	#1
tuxedocivic diyAudio Member Join Date: Jan 2011 Location: Victoria, BC	LIMP measurements WAYYY too high Hey all, Hopefully this is an easy fix. I made a jig like the one here: Measuring Frequency Response Using ARTA I'm using a 16.4 ohm resistor (well, 2 8.2 ohms in series), and I get this: 50 ohms minimum and almost 2000 ohms at Fs!!! I've adjusted the reference resistor setting up and down with no change. Is there a setting I'm missing? Any help is appreciated.

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27th May 2011, 09:15 PM	#2
tuxedocivic diyAudio Member Join Date: Jan 2011 Location: Victoria, BC	Any help is very much appreciated

28th May 2011, 11:16 AM	#3
Henry8 diyAudio Member Join Date: Jul 2010	i dont use this software, but your ref R and dut should form a voltage divider, then the software measures the v arcoss you dut and calcs imp. Check your connections etc, software setup etc. Use a 10R etc instead of a speaker for now, when everything is ok it should measure 10R at 0deg across your set freq range. Then you can test a driver knowing your setp is ok.

6th June 2011, 08:00 PM	#4
tuxedocivic diyAudio Member Join Date: Jan 2011 Location: Victoria, BC	For people in the future, it was my input on my computer. I used mic. Now it's in Line in and it works. Thanks Henry.

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