The TBL0550-1 5µH LISN is a device required to setup conducted noise measurements of DC-powered electronic equipment. It is designed to be used for measurements in the frequency range of 150kHz to 110 MHz according to CISPR 16-1-2, CISPR-25, EN55025, MIL-STD-461F, ISO11452-4 and with limitations DO-160/ED-14G and ISO 7637-2.
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.
Two TBL0550-1 in combination with the Tekbox LISN Mate enable separate measurement of common mode and differential mode noise.
The unit comes equipped with a BNC-male to N-male RG232 cable, mating connectors, and ground brackets to attach it to a ground plane.

• Frequency range: 100 kHz – 150 MHz
• DC Resistance: < 9 mΩ Source+ to DUT+; < 2 mΩ Source- to DUT-
• Maximum current: 50A continuous, 70 A for 3 minutes
• Nominal operating voltage range: 0 – 60V DC;
• Component rating: 250V
• High current plug/screw terminals – male: Phoenix Contact 1998933, female: Phoenix Contact 1967375
• 1µF capacitor can be disconnected internally by removing a jumper
• Dimensions: 120 mm x 100 mm x 225 mm (270 mm including ground brackets); weight: 1.6 kg

• EMC pre-compliance testing of conducted noise

EDN Review TBLM1 and TBOH01 (Kenneth Wyatt)

A conducted EMC pre-compliance test guide by Dr. Min Zhang of Mach One Design, an engineering consulting firm (www.mach1design.co.uk) based in Oxford, UK