A considerable amount of information is recorded in the instrument
logs. For example, the definitions of the general purpose methods
used, special notes regarding any deviations from the general methods,
the tune file current at the time of a particular run, file names,
instrument maintenance procedures, etc., can all be recorded in instrument
logs rather than having to make such notes on the worksheet for each
In this laboratory, each injection on the GC/MS system is logged. This aids scheduling maintenance and troubleshooting problems. Logging each injection also allows a convenient method for unambiguous file name assignment: the data file names are sequential numbers, starting with 00001.D.