Jon, I have had experience from both sides of the fence: customers vs. labs in deciding EUT setup.
Bottom line is all discussions (opinions) stopped once I terminated everything and made sure the terminations were shielded. I populate every connector with a shielded/loaded termination. Doug Jon D Curtis wrote: > > From: "Chuck Derrow" <[email protected]> > Subject: EMC test set-up question > > Hello, > > Our company sells CO based telecommunications testing equipment. Currently we > are re-testing our central controller which lives in a service center / office > complex. This equipment has several rack mount modems which terminate inside > our cabinet on Krone blocks. For EMC testing we generally connect a couple of > 25 pair cables to the blocks in an effort to simulate the installed > application where there are live phone line connected to the modems. > > As I get ready for re-testing due to other changes in the system, IUm seeking > opinions on this Rphone line installation simulationS . > > 1) Should the attached 25 pair cable be terminated into 600 ohms or left > open > for a true simulation. Every phone line attached in the real application will > terminate into a line card in a switch, 600 ohms. > > 2) There are also 48 RS232 ports available in the system for user > terminals. > Currently we connect cables until no change is seen in the radiated > measurements of the system. Should these lines be open ended or have some > sort of termination ? > > I would appreciate any opinion you may have or experience you could share. > > Regards, > > Chuck Derrow > Sr. Compliance Engineer > Teradyne, Telecommunications Div. > [email protected]
