LISN / AMN


Schwarzbeck LISN Overview

A LISN Line Impedance Stabilization Networks / AMN Artificial Mains Network

  • supplies the neccessary mains voltage (AC or DC) and current for the Equipment under Test (EuT).
  • couples interference voltage generated by the EuT and supplies it to the receiver.
  • provides well defined RF-impedance to the Equipment under Test (EuT)
  • keeps away unwanted disturbance coming from mains (filter)
  • protects the mains from unwanted disturbance voltage generated by the EuT

LISN Messaufbau

Figure 1: Measurement setup conducted disturbances

We can distinguish three types of LISN: V-, T- and Delta-LISN.

Figure 2 shows the voltage relationship of a two-line-system with separate ground.

The V-LISN measures the unsymmetric disturbance voltage between the two lines L1 and ground or L2 and ground respectively. V-LISN are also called V-ANM (Artificial Mains Network). The V-LISN is by far the most commonly used LISN.

There are two types of V-LISN with different impedances. The V-LISN with a 5μH inductance (CISPR 16-1-2, CISPR 25, ISO 7637, DO160) are normally used to measure equipment for vehicles, boats and aircrafts connected to onboards mains with DC or 400 Hz. The other Type of V-LISN with 50 µH according to CISPR 16-1-2, MIL STD 461 and ANSI C63.4 is intended to operate at mains frequencies of 50 Hz or 60 Hz.

The T-ISN (Figure 2 right) measures the asymmetric disturbance voltage (common mode voltage) and provides it to an EMI Receiver. T-ISN is normally used for measuring telecommunication and data transmission equipment connected to symmetrical lines as e.g. twisted pairs..
Schwarzbeck LISN-Topology
Figure 2: LISN / AN Topology

Combined LISN Overview Table

LISNImpedanceCurrent Max. (A)Max. Voltage (V)PathsFrequency RangeStandard
Cont.Limit.DCAC 50/60 HzAC 400 Hz
NNBL 8225(50 µH + 5 Ω) || 50 Ω2025025014019 kHz - 100 MHzMIL-STD-461G
NNBL 8226(50 µH + 5 Ω) || 50 Ω7010050025014019 kHz - 100 MHzMIL-STD-461G
NNBL 8226-2(50 µH + 5 Ω) || 50 Ω7010050025014029 kHz - 100 MHzMIL-STD-461G
NNBL 8226-HV(50 µH + 5 Ω) || 50 Ω7010080080014019 kHz - 100 MHzMIL-STD-461G
NNBL 8229-HV(50 µH + 5 Ω) || 50 Ω200100080019 kHz - 100 MHzMIL-STD-461G
NNBL 8230(50 µH + 5 Ω) || 50 Ω30050025025014019 kHz - 100 MHzMIL-STD-461G
NNBL 8240(50 µH + 5 Ω) || 50 Ω8001000100065019 kHz - 100 MHzMIL-STD-461G
NNBM 8124(5 µH + 1 Ω) || 50 Ω70100100040030010.1 – 150 MHzCISPR 16-1-2
CISPR 25
MIL-STD-461F
ISO 7637-2 Transients
ISO 11452-4 BCI
DO-160 (Airborne equipm.)
DEF-STAN-59
ECE R10
NNBM 8124-200(5 µH + 1 Ω) || 50 Ω200280100040030010.1 – 150 MHzCISPR 16-1-2
CISPR 25
MIL-STD-461F
ISO 7637-2 Transients
ISO 11452-4 BCI
DO-160 (Airborne equipm.)
DEF-STAN-59
ECE R10
NNBM 8124-400(5 µH + 1 Ω) || 50 Ω250500100040030010.1 – 110 (150) MHzCISPR 25
ISO 7637-2
CISPR 16-1-2
NNBM 8124-800(5 µH + 1 Ω) || 50 Ω500800100040030010.1 – 150 MHzCISPR 25
ISO 7637-2
CISPR 16-1-2
NNBM 8126-A 8905 µH + 5 Ω || 50 Ω70100600530270110 kHz – 400 MHzCISPR 25
DO-160
CISPR 16-1-2
NNBM DO-160-15005 µH || 50 Ω200280150065065019 kHz – 400 MHzDO-160 (Airborne equipm.)
DEF-STAN-59
NNHV 81235 µH || 50 Ω70100150070030010.1 – 150 MHzECE R10
CISPR 12
CISPR 25
BMW GS 95025-1
NNHV 8123-16005 µH || 50 Ω10001600200070030010.1 – 150 MHzECE R10
CISPR 12
CISPR 25
BMW GS 95025-1
NNHV 8123-2005 µH || 50 Ω200280150070030010.1 – 150 MHzECE R10
CISPR 12
CISPR 25
BMW GS 95025-1
NNHV 8123-200R5 µH || 50 Ω;
(5 µH + 1 Ω) || 50 Ω
200280100040030010.1 - 110 (150) MHzECE R10
CISPR 12
CISPR 25
BMW GS 95025-1
NNHV 8123-4005 µH || 50 Ω250500150070030010.1 – 150 MHzECE R10
CISPR 12
CISPR 25
BMW GS 95025-1
NNHV 8123-400R5 µH || 50 Ω;
(5 µH + 1 Ω) || 50 Ω
250500100040030010.1 - 110 (150) MHzECE R10
CISPR 12
CISPR 25
BMW GS 95025-1
NNHV 8123-8005 µH || 50 Ω500800150070030010.1 – 150 MHzECE R10
CISPR 12
CISPR 25
BMW GS 95025-1
NNHV 8123-800R5 µH || 50 Ω;
(5 µH + 1 Ω) || 50 Ω
500800100040030010.1 - 110 (150) MHzECE R10
CISPR 12
CISPR 25
BMW GS 95025-1
NNHV 8123R 5 µH || 50 Ω70100100070030010.1 – 150 MHzECE R10
CISPR 12
CISPR 25
BMW GS 95025-1
NNLK 8121(50 µH + 5 Ω) || 50 Ω10063040049 kHz – 30 MHzCISPR 16-1-2
NNLK 8121 PLC(50 µH + 1.5 Ω) || 50 Ω10063025042 kHz – 30 MHzCISPR 16-1-2
EN 50065-1
NNLK 8122(50 µH + 5 Ω) || 50 Ω50100075029 kHz – 30 MHzCISPR 16-1-2
NNLK 812950 µH || 50 Ω20040025049 kHz - 30 MHzCISPR 16-1-2
NNLK 8129-2 HV50 µH || 50 Ω200100010002150 kHz – 30 MHzCISPR 16-1-2
NNLK 813050 µH || 50 Ω4004002504150 kHz – 30 MHzCISPR 16-1-2
NNLK 814050 µH || 50 Ω8001000100010005001150 kHz – 30 MHzCISPR 16-1-2
NSLK 8117(50 µH + 5 Ω) || 50 Ω1035025029 kHz – 30 MHzCISPR 16-1-2
NSLK 8126(50 µH + 5 Ω) || 50 Ω1640025049 kHz – 30 MHzCISPR 16-1-2
NSLK 8127(50 µH + 5 Ω) || 50 Ω1640025029 kHz – 30 MHzCISPR 16-1-2
NSLK 8128(50 µH + 5 Ω) || 50 Ω3240025049 kHz - 30 MHzCISPR 16-1-2
NSLK 8163(50 µH + 5 Ω) || 50 Ω6363040049 kHz - 30 MHzCISPR 16-1-2
PVDC 8300150 Ω100150150010.15 MHz - 30 MHz
PVDC 8301150 Ω200250150010.15 MHz - 30 MHz
PVDC 8301-400150 Ω400500150010.15 MHz - 30 MHz
PVSM 832070 mΩ25402501DC