want to know basics of modulation analyzer, want some document to study.

[maha]

I want to know basics and characteristics of modulation analyzer. I need the documents to study. Could you please help me?

[Jack_A.]

I'm assuming you're looking for information about our PXI-5660 and PXI-5670 products. They are our RF Signal Analyzer and Generator, respectively.

Here's the product page for the 5670:
http://sine.ni.com/apps/we/nioc.vp?cid=13491〈=US

and the 5660:
http://sine.ni.com/apps/we/nioc.vp?cid=12591〈=US

If you scroll down to the bottom, you'll see some links to more documentation like the Product Manuals.

Let me know if you're looking for something else.
Jack