How to Use a Lock-In Amplifier for Johnson Noise Experiments

[JamesJames]

Is there a book or website that explains throughly how to use a Lock In Amplifier? I have never used one before and am using it in a Johnson Noise experiment with the "Art of Experimental Physics by Preston and Dietz" acting as the lab manual.

 

[Bystander]

http://www.cpm.uncc.edu/programs/tn1000.pdf

 

[lamurag]

help

Dear all,

I understand the meaning of low pass filter and roll off in Lock-in amplifiers (I think at least). Pratically, the 24db/octave roll off should be better for a grater signal to noise ratio.

So. why there is the possibility to use lower order filters? When I should prefere a 6db/octave filter?

thank you all for help