STEPPED NEUTRAL DENSITY FILTER DIAGNOSTIC TOOL FOR CHANNEL SENSORS
Original Publication Date: 1999-Apr-30
Included in the Prior Art Database: 2004-Apr-09
Xerox Disclosure Journal
Disclosed is a stepped, neutral density filter useable in conjunction with the diagnostic mode of an electrophotographic printing machine to determine the degradation of channel sensors located therein. By using a sensor's known electrical characteristics and relating it to different transmittance levels, a reading can be obtained predicting the sensor's remaining life.