I've been working on a similar test box in my spare time. It takes the two signals from the AC line LISN's, and either adds them together or subtracts them.
In the 'add' mode it cancels differential mode signals, leaving only common-mode interference. The 'subtract' mode leaves only differential interference. You can then incorporate the appropriate measures to reduce that particular interfering signal. The box is not used in the official compliance test procedure. It just helps you find solutions. On Tue, 16 Dec 97 09:18:28 MST, [email protected] wrote: > I'm looking for a source for devices known as: > LISN MATE > & > LISN MARK > > They were designed and build years ago by Mark Nave. I understand that > these devices are used as troubleshooting aids to help determine if a > line conducted emission is common mode or differential. > > There may also be schematics of these designs around so someone could > construct there own. > > Does anyone have any information about these devices? > > Thanks, > Brian Kunde > LECO Corp > Compliance Testing Center -- Patrick Lawler [email protected]
