5x Series Single Phase LISN Overview
The Com-Power 5x Series single phase Line Impedance Stabilization Network (LISN) is engineered specifically for automotive EMC conducted emissions testing. The LI-550C covers a frequency range of 100 kHz to 108 MHz with a 5 µH air-core inductor, fully meeting the LISN requirements defined in CISPR 25 for vehicle, boat, and internal combustion engine-powered device testing. The unit is also compliant with CISPR 16-1-2, making it suitable for broader commercial applications where a 5 µH network and extended frequency coverage are needed. Rated at 50 A AC / 35 A DC, the LI-550C handles the current demands of most automotive modules, from body control units to high-power EV charging electronics.
5x Series Specifications
| Specification |
LI-550C |
| Frequency Range |
100 kHz – 108 MHz |
| Standard Compliance |
CISPR 25 (Automotive) / CISPR 16-1-2 |
| Inductors |
5 µH (air-core) |
| Current Rating (AC) |
50 A |
| Current Rating (DC) |
35 A |
| Voltage Rating |
270 VAC / 380 VDC |
| RF Connector |
50 Ω N-type (female) |
| Insertion Loss |
< 1 dB (100 kHz–108 MHz) |
| Isolation |
20–40 dB (100 kHz–3 MHz); > 40 dB (3 MHz–30 MHz) |
| Mains & EUT Connections |
Superior Electric SUPERCON® shrouded sockets |
| Dimensions (each network) |
13 × 7 × 7 in / 33 × 17.7 × 17.7 cm |
| Weight (each network) |
14 lbs / 6.3 kg |
| Calibration |
Individual, NIST-traceable |
| Warranty |
3 Years |
Key Features
- CISPR 25 Automotive Compliance: Meets the LISN requirements for conducted emissions testing of components and modules installed in vehicles, boats, and devices with internal combustion engines or electric drivetrains.
- 100 kHz to 108 MHz Frequency Range: Covers all CISPR 25 conducted emission bands from Band 1 (150 kHz–300 kHz) through the FM broadcast band (76–108 MHz), enabling complete in-vehicle interference assessment.
- 5 µH Air-Core Inductor: Low inductance delivers stable impedance at high frequencies while the air-core construction prevents magnetic saturation across the full 50 A load range.
- Insertion Loss < 1 dB: Minimal signal attenuation from 100 kHz to 108 MHz ensures measurement accuracy across the entire automotive frequency band.
- 50 Ω N-Type RF Connector: Standard interface for direct connection to spectrum analyzers and EMI receivers.
- Flexible System Configuration: Ships as a pair of separately housed single-conductor networks for single-phase, dual-phase, or DC systems. A second LI-550C pair supports 3-phase setups.
- Individual Calibration: Every unit ships with impedance, isolation, and insertion loss data plus a NIST-traceable calibration certificate.
- Three-Year Warranty: Standard manufacturer warranty included.
Real-Life Use Cases for the LI-550C
| Application |
Description |
| Automotive ECUs & Body Electronics |
Engine control units, body control modules, instrument clusters, and infotainment head units all require CISPR 25 conducted emissions testing before OEM qualification. The LI-550C provides the standardized impedance environment for these measurements. |
| EV & Hybrid Powertrain Components |
On-board chargers, DC-DC converters, battery management systems, and traction inverters in electric and hybrid vehicles generate broadband conducted noise. The 50 A / 108 MHz coverage captures emissions from low-frequency switching harmonics through the FM broadcast band. |
| Automotive Lighting Systems |
LED headlamp drivers, adaptive lighting controllers, and high-intensity discharge (HID) ballasts are common sources of conducted emissions in vehicles. The LI-550C enables CISPR 25 compliance verification for these high-current lighting modules. |
| ADAS & Sensor Modules |
Radar units, camera modules, and LiDAR processors used in advanced driver-assistance systems must pass CISPR 25 limits to prevent interference with in-vehicle radio receivers. The 5x Series LISN supports emissions profiling up to 108 MHz for these safety-critical components. |
| Marine & Powersport Electronics |
CISPR 25 also applies to boats, personal watercraft, and recreational vehicles with internal combustion or electric propulsion. The LI-550C is equally suited for testing marine ECUs, trolling motor controllers, and powersport instrument clusters. |
When to Choose the 5x Series
Select the 5x Series LI-550C when your primary testing requirement is CISPR 25 automotive conducted emissions. Its 100 kHz–108 MHz range and 5 µH inductor are precisely matched to the CISPR 25 LISN definition, covering all conducted emission bands through the FM broadcast frequency range. If your testing also requires coverage of military or aerospace standards (DO-160, MIL-STD 461) with measurements up to 400 MHz, consider the 3x Series instead. For commercial-only testing under CISPR 16 / ANSI C63.4 at 150 kHz–30 MHz with higher current options (up to 100 A), the 1x Series provides a cost-effective solution. The 5x Series fills the gap as a purpose-built automotive and vehicle electronics LISN optimized for CISPR 25 compliance testing at 50 A.
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