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How do I test if VNA cables are OK?

Question asked by drkirkby on May 10, 2013
I've got an 8720D with a set of Agilent 85131F test port cables. These are 3.5 mm and have NMD connectors on them. 

How can I verify if these cables are working properly? I have my suspicions that the cables are not as good as they should be, with perhaps more change in phase with movement than there should be. But I'm reluctant to replace them unless I know there is a fault.