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HP 3780A K01 PPTS
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This is a very unusual item of HP equipment. I bought this for £5 to make use of the case and rear panel. The HP 3780A Pattern Generator is used for telecoms testing and error detection. This item is a customer accessory, hence the K01 designation, and the clues are the names on the front and rear panels, plus the 2 military style connectors on the front panel. 'BRUIN' and 'TRIFFID' were British Army radio communications systems.
Front Panel showing connectors and switches
Rear Panel showing BNC connectors
Top and bottom covers removed