• Two TBOH01 5uH LISN devices
• TBLM2 Common Mode/Differential Mode LISN Mate
• BNC termination
• Two BNC-Male to BNC-Male 35cm RG223
• N-Male to BNC-Male 75cm RG58

The TekBox DC-LISN-COMBO1B includes two (2) TBOH01 5uH LISN devices, one (1) TBLM2 LISN Mate, one BNC termination, two (2) BNC-Male to BNC-Male 35cm RG223, and one (1) N-Male to BNC-Male 75cm RG58.

The TBOH01 5uH LISN is a device required to setup conducted noise measurements of DC-powered devices. It is designed to be used for EMC pre-testing in the frequency range of 150kHz to 110MHz.

The LISN is inserted into the supply line of the DUT (Device Under Test). Conducted noise which is present at the supply terminals of the DUT can be measured at the BNC connector using a spectrum analyzer or a measurement receiver. The source (supply) terminal and the DUT terminal are decoupled by a 5µH inductor.

Basic Diagram of a conducted emission measurement setup with an LISN: 

The TBLM2 is a Common Mode / Differential Mode – separator companion device for LISN. The LISN Mate is connected to the output of a LISN inserted into the positive supply line and to a second LISN inserted into the negative supply line.

The conducted noise signal at the output of a LISN is the sum of common mode and

differential mode noise. The LISN mate separates it into the common mode and differential mode components, with each signal component available at a separate BNC port. The TBLM2 can be used in the frequency range from 9kHz to 110MHz.

Set up for the measurement of differential mode and common mode conducted noise; terminate the unused LISN mate output port with 50 Ohm: