I am junior student in Sungkyunkwan University,South Korea

I am studying Tor for my paper

In my research, onion router has to report its bandwidth by sending descriptor to authority directory.

and then authority directory verifies onion router's bandwidth 

[Question 1]

I hope to know the way how authority directory verifies bandwidth which came from onion router.

I was told that authority directory had bandwidth verifying tool called bandwidth scanner.

How can I get source code of bandwidth scanner ?  

[Question 2]

I made my own onion router, I configured my onion router's bandwidth 100kB/s

But, In updated cached-microdesc-consensus file, My onion router's bandwidth was estimated at 20kB/s and there is "unmeasured=1"

It means my onion router's bandwidth had not been estimated.

what is difference between measured router and unmeasured router ?

Thank you for reading my question