Three phase, 50 uH, 150 kHz to 30 MHz, 32 Amps, FCC/EN/CISPR
The LI-3P-1x series consists of four separate models of four-conductor, 50Ω / 50 μH Line Impedance Stabilization Networks (LISNs). The primary differences between the four models are their respective current ratings:
- LI-3P-116 16 Amps (per line, continuous)
- LI-3P-132 32 Amps (per line, continuous)
- LI-3P-163 63 Amps (per line, continuous)
- LI-3P-1100 100 Amps (per line, continuous)
These LISNs provide the necessary measurement platform for performing power line conducted emissions compliance testing as required by most worldwide standards for commercial products. The LISNs perform each of the following functions during the measurement:
- Provide a defined, stable impedance across the measurement frequency range;
- Isolate the EUT and measurement circuit from the power source, thereby minimizing its influence on the measurements; and,
- Couple the disturbance voltages to the coaxial measurement port, which connects to the measuring instrument.
The LISNs use air-core inductors to prevent saturation and permeability variation. The mounting plates are left unpainted in order to facilitate connection to earth ground in their installation, which is essential due to high leakage currents. The side panels for each LISN are louvered for cooling purposes. The LI-3P-163 and LI-3P-1100 also include two internal cooling fans operated by a switch on the rear panel.
Remote or Local Operation
Remote switching of the line under test (L1, L2, L3, N) is performed using the RLI-100 Remote LISN Interface, which controls the LISN via fiber optic connection.
In addition to the remote method, the line under test can also be selected using the mechanical, four-position switch located on the front panel of the LISNs. Using either switching method, the lines which are not selected are internally terminated into 50 ohms, while the selected line is terminated by the 50 ohm input impedance of the measuring instrument.
Transient Protection
The Com-Power LIT-153A Transient Limiter is a recommended accessory for protection of the RF input of your measuring instrument from potentially damaging, instantaneous voltage transients.
The transient limiter also reduces the possibility of overload by incorporating two 5 dB attenuation/impedance matching pads, in addition to its low-pass and high-pass filter sections which further attenuate any out-of-band emissions.
Calibration
Each LISN is individually calibrated in compliance with the relevant requirements of CISPR 16-1-2 and ANSI C63.4. Impedance, Phase, Isolation, and Insertion Loss data is supplied with each unit, along with the certificate of calibration. Recognized ISO 17025 accredited calibration is also available upon request.