The NNB 21 line impedance stabilization network from Langer EMV-Technik is designed for measuring conducted emissions from DC power cables according to the CISPR 25/ISO 7637 standard.
The unit was designed primarily for automotive EMC test applications and can be used from 100 kHz to 1 GHz. Two circuits can be measured at the same time or separately.
If there are measurements on just one signal line, the second signal path can be grounded via a side switch. The unit also has internal 10 dB attenuation.