LISN MATE

[Brian_Kunde]

     
     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