THD claims of audio signal generators
- From: "Asimov" <Asimov@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 02 Jan 2006 17:11:02 GMT
"mc" bravely wrote to "All" (02 Jan 06 00:39:09)
--- on the heady topic of "THD claims of audio signal generators"
mc> From: "mc" <look@xxxxxxxxxxxxxxxxxxxxxxxxxx>
mc> Xref: core-easynews rec.audio.tech:185968
mc> sci.electronics.design:536317 sci.electronics.repair:353509
mc> My ancient Heathkit audio signal generator, which uses 3 tubes and a
mc> light bulb in an oscillator circuit, claims to produce sine waves with
mc> a total harmonic distortion less than 0.1%.
mc> My semi-ancient Hewlett-Packard HP202B oscillator only claims to
mc> produce THD less than 1%.
mc> I would have expected the HP instrument to have considerably better
mc> performance specifications because of its much more elaborate circuit.
mc> Are we simply looking at pessimistic vs. optimistic ratings?
Some designs take the output at a different location and/or extra
filtering to achieve better distortion numbers. It also depends on the
circuit design, for example using a Wein Bridge configuration instead
of multiple RC phase shifts, etc...
A*s*i*m*o*v
.... Which sparks some mnemonic circuitry.
.
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