Overview
Application
Line impedance stabilization network (LISN) such as the NNB 52 are used to measure distortion signals on the mains cord of an electrical equipment under test (EUT). The distortion signals are usually generated or picked up inside of the EUT and the mains cord acts as an antenna. European and international EMC regulations define maximum permissible signal levels and frequency bands for such distortion signals.
The distortion signal to be measured is available on a coaxial N?connector that is mounted on the front panel of the NNB 52. For the actual measurement of the distortion signals a measuring receiver can be used. The V-network is part of a complex EMC-test setup that also has been standardised in CISPR 16?2?1 (EN 55016-2-1).
Power supply and connectors
The NNB 52 has two separate input connectors for the mains power that are located on the rear of the instrument. The CEE mains socket 4x32 A is used to power the EUT.
This IEC mains connector is used to supply the required power for the control circuit of the LISN. It also supplies the AC power for the built in blower.
Earth connection
The construction of the NNB 52 allows a massive connection to the shielded room wall. Left and right of the front are grounding bars. Additional are located a connection bolt and wing screw on the rear of the LISN.
Remote control connection
The NNB 52 has two built-in remote control circuits and can be controlled with EMI receivers from MEB/Schaffner/Teseq or Rohde & Schwarz.
