Calibration of the MINERvA detector with light injection and cosmic ray muons

Light produced in MINERvA scintillator strips is observed with multi-anode photomultipliers and digitized using custom front-end electronics boards designed around the Fermilab TRIP chip. I will describe the methods used to calibrate the electronics and the photomultiplier tubes and comment on the performance. I will also discuss the method that we use to calibrate the relative light output of the scintillator strips and compare the calibration constants to measurements made with a radioactive source scanner.