Yikes. I might have to find something else to do because Proteomics seems to be growing up. CVs, data completeness, and instrument utilization (IU) measurements?
IU is the actual amount of time that your instrument is collecting useful information. If you've got an EasyNLC it doesn't count that 15min to 7 hours that the pump is kind of thinking about whether it actually is at 0 bar before finally starting to flow solvent again.