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478A Option H89

Question asked by rmax on May 15, 2015
     Does anyone know of a published data sheet for an HP 478A option H89? I use this mount in a metrology application for verifying the power reference on all power meters in our inventory. I use it with an N432A/3458A for precision measurements. It does go back to Keysight's standards lab for certification and I have the original factory calibration certificate from decades ago however I have never found any reference to this option through the Keysight web services and just wondering if anyone knows of a reference document for it? I am very comfortable that it is an appropriate choice for verifying the 50 MHz power references based on the standards lab report,  but just looking for any published history on this option. 
Thank you, 
Randy Lenox