LISN Line Impedance Stabilisation Networks / AMN Artificial Mains Network
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
- 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.
LISN Line Impedance Stabilization Network (LINS) - Mfumo wa LISN Line Impedance Stabilization Network (LINS) - Mfumo wa LISN Line Impedance Stabilization Network (LINS) - Mfumo wa LISN Line Impedance Stabilization Network (LISN) - hutoa voltage ya umeme (AC au DC) na umeme unaohitajika kwa vifaa vya chini ya mtihani (EUT). - couples interference voltage generated na EuT na hutoa kwa mpokeaji. LISN ni aina tatu za LISN: V, T, na Delta LISN. V-LISN ni kipimo cha voltage ya usumbufu usio sawa kati ya mistari miwili L1 na ardhi au L2 na ardhi. V-LISN pia huitwa V-ANM (Artificial Mains Network). V-LISN ni kwa mbali LISN kutumika kwa kawaida. Kuna aina mbili za V-LISN na impedances tofauti. VLSN (CISPR 16-1-2), VLSN (CISPR 25-1-2), VLSN (CISPR 25-1-2), VLSN (CISPR 25-1-2) na VLSN (CISPR 25-2) ni vifaa vya kawaida vya kupima vifaa vya magari, mashua na ndege zilizounganishwa na mifumo ya umeme ya ndani ya gari na DC au 400 Hz. VLSN ya aina ya V na 50 mH kulingana na CISPR 16-1-2 na ANSI C63.4 ni lengo la kufanya kazi katika masafa ya umeme ya 50 Hz au 60 Hz. T-ISN (Figure 2 kulia) hupima asymmetric usumbufu voltage (common mode voltage) na hutoa kwa EMI receiver. TISN ni kawaida kutumika kwa ajili ya kupima mawasiliano ya simu na vifaa vya uhamisho wa data kushikamana na mistari symmetrical kama vile: jozi twisted.