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50 ohm terminator plug

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alimjoco

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What is the use and application of a 50 ohm terminator plug?
 

FvM

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It can e.g. provide end termination in a multiple drop connection. Sometimes it's suggested to terminate unconnected in- or outputs of instruments. It can be also used for impedance calibration.
 

alimjoco

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why should I terminate unconnected in or outs? what should be the difference of left open or terminated with a 50ohm plug?
 

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why should I terminate unconnected in or outs?
That's something you have to ask the respective instrument manuals. I have seen this e.g. with reference frequency outputs. I guess, it's to suppress radiated emissions from the connector. Termination may also be needed by the internal circuit to keep a nominal signal level that is supplied to other instrument parts.
 

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