%1.4 Environmental Conditions1.4 ENVIRONMENTAL CONDITIONS1.4.01 Acoustic RatingNear Letter Quality ModeMicroline 520 54.9 dBAMicroline 521 54.4 dBAUtility ModeMicroline 520 57.2 dBAMicroline 521 56.9 dBAQuiet ModeMicroline 520 52.5 dBAMicroline 521 52.3 dBA1.4.01 Altitude10,000 feet (3,050 meters)1.4.03 Ambient Temperature and Relative Humidity (RH)While operating: 41 to 104 degrees Fahrenheit (5 to 40 degrees Celsius)Operating humidity: 20% to 80% RHWhile in storage: 14 to 122 degrees Fahrenheit ( - 10 to 50 degrees Celsius)Storage humidity: 5% to 95% RHML520/521 ( 96-02-04 )
