Description:

A V-LISN from the series of the NSLK line is required to measure conducted interference voltages according to VDE-, CISPR- and related standards. It provides the device under test with a mains connection that has a standardized impedance of 50 Ω || (50 µH + 5 Ω) and reduces interference voltages coming from mains. The interference voltage of the device under test is decoupled via a 7 kHz high pass filter to the EMI measurement receiver.

The NSLK 8117 is equipped with a 250 µH choke as well as with a 50 µH choke which is connected in series for each path. The 250 µH choke provides an excellent decoupling between the power supply and the device under test starting at 9 kHz.

Instructions for use:

Important! Connect the LISN to protecting earth BEFORE applying any voltage to it! For this purpose you can use the screw terminal at the front panel and the M4 thread holes at the rear side of the device. If you use the M4 thread holes at the back of the device make sure that the screws do not extend into the housing more than 10 mm.

Additionally a protective earth using a RF choke is functional as soon as the supply cable of the LISN is connected to a Schuko socket that is conform to the standards.

Due to high capacities very high leakage currents can occur. Thus it is not possible to use a residual current operated circuit breaker. It is recommended to use an isolating transformer.

The supply voltage has to be applied at the back panel of the LISN by using the Power supply socket.

The device under test has to be connected to the Schuko socket at the front panel. The maximum current that can be drawn is 10 A for each path. The maximum voltage that can be applied is 250 VAC.

One slow blow 16 A fuse is built into this LISN for each path to protect the device under test. The fuse holder is built into the LISN on a PCB, where you can also find a spare fuse in a separate holder.

Before you change the fuse make sure that the power supply is removed.

The coaxial RF output has to be connected to the EMI measurement receiver using a BNC coaxial cable.

The path that is not being measured has to be terminated with a 50 Ω dummy load. The protective ground conductor of the DuT  connector  is connected to the measurement ground directly.

“Artificial Hand”

If an „artificial hand“ has to be connected to the equipment under test, a copper foil wrapped around the handle of the device under test has to be connected to the screw terminal labeled with “Hand Simulation”.

General Information:

For measurements conforming to standards the references in the standard CISPR 16-2-1 have to be followed. Amongst others it is described that the AMN has to be grounded with a short and wide ground strap to the wall of the shielded chamber (or provisionally to a sheet metal board at the wall).

The LISN can be grounded using the screw terminal at the front panel as well as the M4 thread holes at the rear panel.

According to CISPR 16-2-1 the connecting cable of the device under test has to be laid in a 40 cm distance to the metal wall and the length of the cable should be 80 cm or being laid meander like. The way the cable is laid and the type of protective ground connection but also the capacitance of the equipment under test can influence the disturbance voltage especially at higher frequencies.

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