Re: HP8903B - THD measure on Phono RIAA preamplifier
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Attilio, What distortion values did you get? Also, what were the values you expected (and what is the preamp)? Is the level you are using for this testing appropriate for an RIAA preamp??
If indeed too far off, I'd recommend you look into possible sources of noise (such as improper?grounding), as the 8903 will return THD+N. For pure THD readings, I recommend you consider using an audio interface + something like ARTA. You can typically use the "monitor" output of the distortion analyzer to get a conveniently normalized level which would protect your interface and get the best of all worlds.?
Radu.?
Good morning everyone,
I recently bought an HP8903B audio analyzer, and I'm trying to test a RIAA phono preamp with it. I was able to check the RIAA response curve, but I didn't get decent results as far as the distortion measure is concerned.
I was thinking of inserting a precise reverse RIAA between the HP8093B output and the phono preamplifier input so that the HP8903B sees it as a line preamp and I can have a correct distortion measurement.
What do you think ?
Is there any better method?
Thanks for any advice / suggestion.
-- Cheers
??? Attilio
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