heathkit IM-58 howto?

damage · 23rd February 2010, 02:57 AM

How do I use this thing Perry? Mine is either broken or I'm stupid. Both are very likely!

jackinnj · 23rd February 2010, 03:02 AM

I had one of these -- Helps to get the manual from www.w7fg.com Basically you notch the fundamental frequency, then measure everything which is left. You should be able to measure THD down into the range of 0.007% or so.

Perry Babin · 23rd February 2010, 03:09 AM

I've never used that distortion analyzer but in general you...

drive a test tone into an amplifier
set the reference level for the output of the amplifier
tune the analyzer's filter to the precise frequency of the test tone
read the distortion from the residual left after the test tone is filtered out

They're not very useful. I have an HP analyzer but never use it. A good sound card and software make a better analyzer (as far as cost is concerned).

PDF page 9:
http://www.twin-x.com/groupdiy/album...athkitIM58.PDF

damage · 23rd February 2010, 04:51 AM

Thanks guys! I kinda thought it was a notch filter, but wasn't sure whether it generated it's own tone or not.

23rd February 2010, 02:57 AM	#1
damage diyAudio Member Join Date: May 2006	heathkit IM-58 howto? How do I use this thing Perry? Mine is either broken or I'm stupid. Both are very likely!

23rd February 2010, 03:09 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I've never used that distortion analyzer but in general you... drive a test tone into an amplifier set the reference level for the output of the amplifier tune the analyzer's filter to the precise frequency of the test tone read the distortion from the residual left after the test tone is filtered out They're not very useful. I have an HP analyzer but never use it. A good sound card and software make a better analyzer (as far as cost is concerned). PDF page 9: http://www.twin-x.com/groupdiy/album...athkitIM58.PDF __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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23rd February 2010, 03:02 AM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	I had one of these -- Helps to get the manual from www.w7fg.com Basically you notch the fundamental frequency, then measure everything which is left. You should be able to measure THD down into the range of 0.007% or so.

23rd February 2010, 04:51 AM	#4
damage diyAudio Member Join Date: May 2006	Thanks guys! I kinda thought it was a notch filter, but wasn't sure whether it generated it's own tone or not.

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