NNLK 8121, 9 kHz - 30 MHz, 400 VAC / 100A, 50 µH, 4 Path LISN

The purpose of a LISN is to provide the device under test with energy, to carry the interference voltage to the EMI measurement receiver and to load the RF emitted by the device under test with standardized impedance.

The NNLK 8121 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.

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 aluminum brackets at the rear side of the device.

Due to high capacities very high leakage currents can occur (above 1 A). 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 wing terminals.

Important! The operator has to make sure that the maximum current is limited to 100 A at the supply side. There is no fuse built into this LISN to protect the device under test!

The device under test has to be connected to the wing terminals at the front panel.

The input for the power supply is located at the back panel and provides wing terminals as well.

The coaxial RF output has to be connected to the EMI measurement receiver using a BNC coaxial cable. You can choose the path that needs to be measured with the path selection switch. The paths that are actually not measured will be terminated with 50 ? automatically. From S/N 937 up (RC models since S/N 6236) an improved cooling system allows operation at 100A over the whole frequency range.

The option “High current” is no longer required.

Specifications:
Frequency range:	9 kHz – 30 MHz
Max. cont. current:	4 x 100 A
Pre-filter Choke	250uH
Max voltage (DC)	630V
Max. voltage (AC 50/60 Hz):	400VAC See below L-L diagram
Total Power Dissipation	2.5kW
Impedance:	(50 µH + 5Ω) \|\| 50 Ω
Connector to EMI Receiver	50 ohm N
EuT and Mains Connectors	Wing Terminals 8mm, not removable
Dimensions of the housing (WxDxH):	450 mm x 370 mm x 480 mm
Weight:	33 kg

Options:

Opt. RC:

Option RC for LISN: Remote Control with built-in power supply. LISN can be controlled by R&S or Schwarzbeck code, including remote control cable for your receiver type (Please specify your receiver type!). LISN can be selected from the R&S receiver menu or in the EMC32 software like an R&S LISN. No programming of the user interfaces necessary. Functions: path selection and PE grounded or via choke.

Opt. Hochstrom:

Option: cont. high current, additional terminals to bypass the 250 µH prefilter-chokes, provides less voltage drop and less heating.

Opt.Lüfter:

Cooling Fans

Opt. TC:

The temperature monitor module which is optionally available for the NNLK LISN warns the user visually and acoustically when the temperature gets too high. It controls the fans of the LISN temperature-dependent, too, and thus prevents overheating. If a critical temperature is reached the temperature control module indicates this optically and acoustically.

The NNLK 8121 is equipped with a high pass filter but not with a pulse limiter. The EMI receiver should therefore be protected against overload. The VTSD 9561 F is an external pulse limiter that is suitable for this purpose. If the amplitude of the disturbance voltage exceeds values which could be dangerous for the EMI receiver input the pulse limiter will cut these pulses. This causes additional spectral lines in the frequency domain (“phantom spectral lines”). The excess-pulse-energy illuminates an electric bulb. If the bulb glows or lights up the measurement is not valid because of the phantom spectral lines. In such a case more attenuation must be used at the measuring port of the LISN. An external attenuator must be dimensioned sufficiently especially under the presence of strong harmonics of the mains frequency

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