NNLK 8121, 9 kHz - 30 MHz, 250(400) VAC / 50A, 50 µH, 4 Path LISN

The purpose of a LISN is to provide the device under test with energy and to decouple it from mains, 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 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.

The device under test has to be connected to the wing terminals at the front panel. The maximum current that can be drawn is 50 A for each path. The maximum voltage that can be applied is 250 VAC or 400 VDC. For a short period of time 100 A may be drawn from the LISN. If you want to use more than 50 A regularly, consider buying the options “high current” and “fans”, then 100 A may be drawn continuously.

Artificial mains networks from the NNLK line do not have the pre-filter choke contrary to the NSLK line (exception: NNLK 8121). This is due to the high current rating and complies with the CISPR standard for LISN’s for band B.

Specifications:
Frequency range:	9 kHz – 30 MHz
Max. cont. current:	4x 50 A (100A short duration or continuous with high current option & fan option)

Max voltage (DC)	400 V (option for 630V)
Max. voltage (AC 50/60 Hz):	250 V (option for 400V) See below L-L diagram

Impedance:	(50 µH + 5Ω) \|\| 50 Ω

EuT Connectors: Wing terminals	Wing Terminals 18mm, not removable
Dimensions of the housing with wing terminals opened(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.400/700 V:

400/700 V Voltage to ground / Voltage between lines

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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