RIAA Filter Weighting Button?

QA401
1

Hi Matt,

I often refurbish vintage amplifiers which usually include a phono stage. To test them I have a reverse RIAA equalisation, but wondered if it would be possible to add a RIAA weighting button?

BR

Simon.

2

I am not Matt, nor am I an expert. But, there does seem to be a possible solution on page 32 of the QA401 User manual.

3

Thanks for that, well spotted!

4

There’s also a blog post on measuring RIAA at the link below. the post shows the measurement with multi-tone, but it also works were the an expo chirp. In the end, load the opposite curve as a user weighting and if your RIAA filter in the DUT is working correctly, the spectrum line will be flat.