What are the differences between the FRF in signal express and the Dual Channel Spectral Measurement?

[rbmtx]

What are the differences between the FRF (Frequency Response Function) in signal express and the Dual Channel Spectral Measurement?  If I compare the two by using the same stimulus and response signals (hammer impact and accelerometer) and the same filter, both give the same result.  By definition, they should be the same operations, is this so?  As is, the Dual Channel Spectral Measurement is easier to work with.  Why would I want to use the signal express FRF? 

[JÞB]

Well, after drilling into them both (The block diagrams are unlocked)  About the only difference is that the Dual Channel Spectral mesurement can operate on attars on signals.  The algorithms are identical (Although implementation differs as to exactly where some steps are implemented.

Its so nice "Code it twice"!

[rbmtx]

Thanks Jeff,

Now what's an attar?

[JÞB]

Arrays!