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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: We don't want to talk about it with the type that hang out in Prop Heads. posted by Steve Eddy on February 11, 2011 at 10:23:19:
For everyone to know and understand: I use a ST 1700B, and have used one since 1976, but this must be also used with another piece of test equipment, for example a computer with a digital FFT program to act as a noise averager, and a spectrum analyzer.
In some of my PUBLISHED measurements, I used a program called 'MactheScope' with some satisfaction. However, before this, I used an HP3581 with B&K chart recorder, and an HP3580 with a scope screen. These two instruments, while not averaging, could be made to sweep slow enough to work.
For THIS application, FFT with signal averaging, is better, mostly because it is FASTER. Waiting 1/2hour for each measurement can get tiring.
Today, I use an HP 3563, while obsolete in military terms, cost 27,000+ dollars, new, and has more computing power than I will ever use in my lifetime. It gives me the SAME quality measurements, with signal averaging, in less than 1 minute.
However, I have also changed my Sound Technology for another unit, very much the same. Guess what, the SAME distortion measurement gives me the SAME distortion! What a concept!
Now, what could be wrong? Well maybe the ST has a grounding problem that is unique to it. It's possible, but what is it? Where is it? WHY does it act up with ONLY some cables, with the SAME length, characteristic impedance, RCA plug termination, DC resistance, parallel capacitance, etc? Also, why do SOME cables get 'better' and measure with much lower distortion over weeks, months, or years, yet some nearly identical cables, not often used for anything, measure just as bad as the original units that 'mysteriously' got better? This is not for SE, he has heard it all before, any suggestions anyone?
Edits: 02/11/11 02/11/11
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- RE: We don't want to talk about it with the type that hang out in Prop Heads. - john curl 11:37:15 02/11/11 (0)
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