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Old 12th October 2009, 03:26 PM   #11
Hardi is offline Hardi  Germany
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Quote:
How do you perform spectral distortion analysis?
Audio Precision SYS222A. Sometimes i use a HP3561A with a simple 1 KHz/50 dB Notchfilter, but AP is much more"comfortable" and better.

Quote:
What, if not this task, you use your 3582 for???
I own my 3582A for over 15 Years.....Now its just "a part of my collection".

PS: I am also interested in a pcb set....So if you can manage to find a source...
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Old 12th October 2009, 04:45 PM   #12
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I try hard to get the pcbs. Maybe I'll make my own ones. I keep you informed. Where do you come from? I live in Darmstadt.
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Old 13th October 2009, 05:41 PM   #13
Hardi is offline Hardi  Germany
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An example for measuring THD with the 3582A:

Signal source is an HP339A generator. 1KHz /1V.

Click the image to open in full size.

Nothing to see on a 3582A.

Now 1KHz/1V through a simple double-T notchfilter. Attenuation depends extremly on the 1KHz accuracy. Using the 339 vernier allows up to 80 db (for a minute or so), because of the "cold" generator drift.
It´s better to give all parts (339, notch and 3582) 30 min. to warm up.



Click the image to open in full size.

Second Harmonic is about -108 dB (AP measures -106,8 dB).

Last edited by Hardi; 13th October 2009 at 05:56 PM.
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Old 13th October 2009, 05:51 PM   #14
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What means "simple" notch filter? Passive one???
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Old 13th October 2009, 05:51 PM   #15
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Nice pics.
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Old 13th October 2009, 06:13 PM   #16
Hardi is offline Hardi  Germany
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It´s an active one with feedback. Q is set to "1", thereby the second Harmonic (2 KHz) is not attenuated.

Something like this will work:

http://www.mikrocontroller.net/attac...6042/notch.png
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Old 13th October 2009, 06:40 PM   #17
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got my PN???
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Old 15th October 2009, 09:32 AM   #18
h_a is offline h_a  Europe
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So much is possible today with a simple soundcard and software like ARTA or similar. Does distortion spectra, spectrum analysis and more and that for free (free version available).

Sure, not as good as dedicated equipment, but you might want to try it!

Have fun, Hannes
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Old 16th October 2009, 06:22 PM   #19
Hardi is offline Hardi  Germany
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I think most people in the DIY world know about the performance of a -good- (!) (not a simple) soundcard in combination with an appropriate attenuator.


Using classic FFT Analyzers today is a point of principle
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Old 24th November 2009, 06:30 AM   #20
cliffyk is offline cliffyk  United States
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The HP 3582A spectrum analyzer is a CRT equipped version of the 3581A wave analyzer, it has a 90dB dynamic range (0.004% THD noise floor) and is calibrated to an 80dB (0.01% THD) range.

I have two 3581As, and wish I had a 3582A, and have yet to find a digital instrument, I can afford, that is as competent.

Here's the 0.0Hz to 20kHz spectrum of a 1.0kHz signal from a Kikusui ORC-11 low-distortion (0.0019%) generator, captured from the X and Y outputs of a 3581A via my Lecroy WaveJet 322...

Click the image to open in full size.

The 3581/2 built-in tracking generator allows complete network analysis and provides a well defined sine wave (<0.2% THD if properly calibrated) for response plotting from 10Hz to 50kHz.

These things are getting pretty old, but they are nonetheless still quite useful...
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