MIL-F-28811A, MILITARY SPECIFICATION: FREQUENCY STANDARD, CESIUM BEAM TUBE (26-APR-1985)

MIL-F-28811A, MILITARY SPECIFICATION: FREQUENCY STANDARD, CESIUM BEAM TUBE (26-APR-1985)., This specification covers the performance requirements for a time and frequency standard, hereinafter referred to as the instrument, which uses a cesium beam tube resonator to stabilize the output frequency of a quartz crystal oscillater. The instrument provides an extremely high order of frequency accuracy and is capable of serving as a primary frequency reference.