282 Keysight E8402A, E8404A C-Size Mainframes User and Service GuideKeysight E8402, E8404A Product Specifications Acoustical Noise SpecificationsFan Speed increments through 8 discrete speeds as a function of:Module exhaust temperature limits (user settable)Module exhaust temperature rise (T) limitsAmbient temperature limit (user settable)Power supply temperature limit (fixed).Assuming default limits:At full load:Low Speed up to approximately 30CHigh Speed above approximately 40CAt no load:Low Speed up to approximately 40CHigh Speed above approximately 50CAirflow PathInlet through rear and exhaust through upper sides for both power supply andmodules. Allow 50mm clearance for proper airflow.Air Filter Kit available for demanding environmental applications.Acoustical Noise SpecificationsLow Fan Speed: 41.4 dBA sound pressure at bystander position, 1m infront of mainframe.High Fan Speed: 54.9 dBA sound pressure at bystander position, 1m infront of mainframe.Backplane Specifications– Solid state automatic daisy-chain jumpering for BUS GRANT and IACKsignals.– Full differential distribution of CLK10.– ACFAIL* and SYSRESET* in full compliance with the VMEbus and VXIbusSpecifications.– Surface mount construction and no sockets for maximum reliability.General Monitor SpecificationsIndicators– Power/Stdby: Glows amber in Standby and line connected.
