Try the code below on a define and calibrated tip:


S(1)=SNSDEF/PROBE,INDEX,POL,90,180,0,0,1,127,2
DECL/LOCAL,DOUBLE,tiprad
tiprad=OBTAIN/SA(1),5
write/did(_term),' ordinal 5: ',tiprad

If my version's ordinal number is different from yours, refer to the Cami "Dmis Manual version 3", turn the section on sensors, look for the output section and locate the the ordinal value for the tip diameter.