Is It Good To Measure Thd20?

[zsaudio]

Hi all

Could anyone help me on technical details?
I'm looking for test equipment to measure THD20 and IMD CCIF down to 1ppm.
Searching on the web i found NI USB-6212 at acceptable price.
Ap is too expensive for me.
My question is does this meet to my request whitout using any special notch filter and distortion magnifying?

http://sine.ni.com/nips/cds/view/p/lang/en/nid/204054

http://www.ni.com/pdf/manuals/371932e.pdf

Any comments are welcome

Zsolt