Overview
Com-Power LI-220A Description:
The Com-Power LI-220A Line Impedance Stabilization Network (LISN) is in full compliance with both CISPR 16-1-2 and ANSI C63.4. It provides the necessary measurement platform for performing power line conducted emissions compliance testing as required by most worldwide standards for commercial products. The LI- 220A performs each of the following functions during the measurement:
• provides a defined, stable impedance across the measure - ment frequency range; and,
• isolates the EUT and measurement circuit from the power source, thereby minimizing its influence on the measure - ments; and,
• couples the disturbance voltages to the coaxial measure - ment port for connection to the measuring instrument.
This LISN uses air-core inductors to prevent saturation and permeability variation. The mounting plate of the LI-220A is left unpainted in order to facilitate connection to earth ground in its installation, which is essential due to high leakage current.
Versatility
The LI-220A is a dual-conductor network capable of handling currents up to 20 Amps (AC) per line. The EUT power port is fitted with a universal, multi-configuration receptacle, which accomodates almost any EUT plug without the need for adapters. The power input port is fitted with a standard IEC C20 receptacle. As shown in the diagrams on the right, the LI-220A can be installed into any type of power system, including DC, single-phase, dual-phase and even three-phase systems.
Transient Protection
Com-Power Transient Limiters are a recommended accessory in order to protect 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
All Com-Power LISNs are 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.
Specifications:
- Specification: CISPR 16-1-2 / ANSI C63.4
- Application: Power Line conducted emission tests
- Frequency Range: 9 KHz - 30 MHz
- RF Connector: 50 Ohms N-type (female)
- Current Rating: 20 Amperes AC, 14 Amperes DC
- Voltage Rating: 270 VAC (Line to Ground), 380 VDC
- Inductors: 250 & 50 microhenry (air-core)
- Mains & EUT Connections: IEC 60320, C-20 @Mains and Universal multi-configuration @EUT
- Dimensions (each network): 16.75 x 15.5 x 7.5 inches / 42.5 x 39.3 x 19 cm
- Weight (each network): 20.5 lbs / 9.3 kg
- Insertion Loss: 6 dB to 1 dB (9 kHz to 15 kHz), Decreasing linearly with log of frequency
< 1dB (15 kHz to 30 MHz) - Isolation: 20 dB to 40 dB (9kHz to 50 kHz), Increasing linearly with log of frequency
>50 dB ( 50 kHz to 30 MHz)
