Bob, if you are just trying to identify the type you could connect a boradband scope with hig impedance input from each line to ground, assuming the conductors are carrying AC. The voltages from each side to ground should be nearly identical if the common mode currents are close to the same value, i.e. equal volatges. If there is much difference, you can be sure DM currents are flowing.
regards, Ralph Cameron Consultant in EMC and Suppression of consumer electronic equipment (After sale) ----- Original Message ----- From: <rehel...@mmm.com> To: <emc-p...@majordomo.ieee.org> Sent: Tuesday, January 04, 2000 5:20 AM Subject: Common Mode or Differential Mode > > > > Are there "rules of thumb" or a "quick and dirty" means of determining > whether conducted emission noise (or radiated) is common mode or > differential mode? > > Thanks and have a great new year. > > Bob Heller > 3M Company > > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to majord...@ieee.org > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to ed.pr...@cubic.com, > jim_bac...@monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). > > > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
