The Termination Box is built in an Original size FLEXI-BOX on a dedicated PCB. The connectors can be selected from BNC, TNC, N or SMA. The box contains Short, Open and Load. It is intended as a lab aid and is also part of the "Standing Wave Kit". The Load is selected at 50Ω and the SHORT and OPEN are approximately equal in mechanical length with the physical ends marked on the escutcheon. The electrical length of the connectors are discussed in the article The importance of using calibration standard definitions for a Vector Network Analyser and the Termination Box could be used as a low frequency calibration kit by modifying the connectors as in the article.
![[Graph of termination return loss]](../../images/term-1.gif)
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