Schwarzbeck NNLK 8140 V-Line Impedance Stabilization Network

The single path high current Line Impedance Stabilisation Network (LISN, AMN) NNLK 8140 mainly serves to measure disturbance voltage in band B from 150 kHz to 30 MHz. It is designed to withstand very high currents and voltages. So far voltage probes had to be used for high currents and high voltages.

However voltage probes do not provide a standard impedance to the device under test so a voltage probe measurement has reduced reproduceability. The NNLK 8140 with a continuous current capability of 800 A solves this problem.

Before usage the NNLK 8140 must be connected to earth potential. The green/yellow wing terminals at the front and back side must be used for this purpose. During a conducted disturbance voltage measurement all paths must be connected via the red wing terminals of the NNLK 8140. In a DC or AC system usually 2 units of NNLK 8140 are required. In a rotating current system 3 or 4 units may be required depending on the the existence of a neutral line.

One path at a time is connected to the EMI receiver using a coaxial cable with BNC plug. All other BNC connectors of those NNLKs which are not being measured at a time must be terminated using high power BNC 50 Ohm terminations.We recommend to use terminations of at least 10 W or better: 50 Watt. The exact test set up is described in CISPR 16-2-1.