BNB 8652 B HV Line Stabilization Network (LISN)

A LISN, here implemented as a battery impedance network, shall supply electric power to the device under test and provide a standardized impedance. It has been developed for automotive tests e.g. to fulfill the requirements of ISO 21498- 2: 2021-03, MBN 11123: 2021-08, (VW 80300: 2021-02), “VOLVO Impedance Stabilization Network (VISN)”, and "TVB ELECTRICAL QUALITY AND EMC REQUIREMENTS".  Due to the very strict specifications regarding the tolerance for the absolute impedance in VW 80300: 2021-02 (+/-10%) and the physically achievable measurement uncertainty for resistance measurements in the milliohm range, a few values approach the limit line (uncertain), touch the limit line, or even exceed it (fail). This only affects a few values, but is unavoidable, which is why compliance with this standard is indicated in parentheses ().

The BNB 8652 B is constructed symmetrically with two paths, HV+ and HV-. The built-in components have no specific polarity, especially the capacitors have no polarity. The paths are isolated from the housing.  A foil capacitor with very low equivalent series resistance (ESR) has been used.

 It is also possible to inject disturbance voltages. Inside the housing the BNB 8652 B can be changed over from LISN functionality to couple functionality (BNB-CN) when connecting the wires differently.

 A battery can be simulated by various internal resistors. There are five possible values: 2 x 100 mΩ, 2 x 60 mΩ, 2 x 50 mΩ, 2 x 25 mΩ, and 2 x 10 mΩ (one resistance in each path).  The self-inductance between the resistance connections on the EUT side is not more than 0.5 μH.

• Option BNB-CN: Coupling function according to the specifications of “MBN 11123-343.”  The coupling network operates via two coupling transformers at HV+ and HV- inside the BNB 8652 B housing. It is designed to allow the LFPA 9733 C to couple the desired levels (±15 Vpeak) in the range of 10 Hz to 150 kHz.
  4x safety banana jacks (“Transformer HV+/-“) are provided on the housing (on the DuT side) for this purpose, enabling the signals from the LFPA 9733 B to be coupled in.
  The maximum current for operating the BNB as a coupling network is 80 A.
  Inside the housing, it is possible to switch between the LISN function and the coupling function of the BNB 8652 B.