What is Lock-in?
1.
a group gathering where you are "locked" in a building. It may include games, movies, but never sleeping! sleeping is for losers :oP
Lauren and Monica went to the lock-in and didn't sleep. They were up till 6am
See
2.
popular slang for a homodyne with an extremely low pass filter, which making it very narrow band. Usually includes a frequency mixer, and not to be confused with bandpass filter.
"That lock-in is essentially shot-noise limited."
"I'm using the reference from that lock-in because I don't have a function generator."
See
