2x Series Single Phase LISN Overview
The Com-Power 2x Series single phase Line Impedance Stabilization Network (LISN) extends conducted emissions measurement capability down to 9 kHz, covering the full 9 kHz to 30 MHz frequency range required by CISPR 16-1-2 and ANSI C63.4. Unlike the standard 1x Series that begins at 150 kHz, the 2x Series incorporates dual 250 µH and 50 µH air-core inductors, providing the additional impedance stabilization needed for accurate low-frequency measurements. This makes it the ideal choice when testing must address emission requirements below 150 kHz.
2x Series Specifications
| Specification |
LI-220C |
| Frequency Range |
9 kHz – 30 MHz |
| Standard Compliance |
CISPR 16-1-2 / ANSI C63.4 |
| Inductors |
250 & 50 µH (air-core) |
| Current Rating (AC) |
20 A |
| Current Rating (DC) |
14 A |
| Voltage Rating |
270 VAC / 380 VDC |
| RF Connector |
50 Ω N-type (female) |
| Insertion Loss |
6 dB to 1 dB (9 kHz–15 kHz); < 1 dB (15 kHz–30 MHz) |
| Isolation |
20–40 dB (9 kHz–50 kHz); > 50 dB (50 kHz–30 MHz) |
| Mains & EUT Connections |
IEC 60320 C-20 @ Mains / Universal multi-config @ EUT |
| Dimensions (each network) |
16.75 × 15.5 × 7.5 in / 42.5 × 39.3 × 19 cm |
| Weight (each network) |
20.5 lbs / 9.3 kg |
| Built-in Transient Limiter |
No (external recommended) |
| Calibration |
Individual, NIST-traceable |
| Warranty |
3 Years |
Key Features
- Extended Frequency Range (9 kHz–30 MHz): Covers the full CISPR 16 Band A (9–150 kHz) in addition to Band B (150 kHz–30 MHz), enabling complete conducted emissions assessment.
- Dual 250 & 50 µH Air-Core Inductors: The 250 µH inductor provides impedance stabilization at low frequencies, while the 50 µH inductor handles the standard 150 kHz–30 MHz range. Air-core construction eliminates saturation.
- 50 Ω N-Type RF Connector: Standard interface for direct connection to spectrum analyzers and EMI receivers.
- Individual Calibration: Ships with impedance, phase, isolation, and insertion loss data along with a NIST-traceable calibration certificate.
- Flexible System Configuration: Includes a pair of single-conductor networks for single-phase, dual-phase, or DC systems. A second LI-220C pair supports 3-phase setups (Wye or Delta).
- Three-Year Warranty: Standard manufacturer warranty included.
Real-Life Use Cases for the LI-220C
| Application |
Description |
| Lighting & LED Drivers |
LED drivers and electronic ballasts can generate significant conducted noise below 150 kHz. The 2x Series captures these low-frequency emissions for compliance with EN 55015 and CISPR 15 lighting standards. |
| Power Supplies & Converters |
Switch-mode power supplies (SMPS) and DC-DC converters with low switching frequencies emit noise in the 9–150 kHz band. The LI-220C enables full-spectrum conducted emissions profiling down to 9 kHz. |
| Renewable Energy Inverters |
Solar inverters and wind turbine converters often operate at switching frequencies that produce emissions below 150 kHz. The extended range is essential for testing to IEC 62920 and EN 50549 requirements. |
| EV Chargers & Motor Drives |
On-board chargers and variable-speed motor drives generate low-frequency conducted emissions from PWM switching. The 9 kHz start frequency ensures no emissions are missed during pre-compliance or final certification testing. |
| Medical Device Testing |
Medical equipment standards such as IEC 60601-1-2 reference CISPR 11 with measurements starting at 9 kHz. The LI-220C provides the extended range needed for full compliance verification of medical-grade power electronics. |
When to Choose the 2x Series Over the 1x Series
If your testing requirements only cover 150 kHz to 30 MHz, the 1x Series LISNs (available from 20 A to 100 A) are a cost-effective and compact solution. Choose the 2x Series LI-220C when your product standard or end-customer mandates conducted emissions measurements starting at 9 kHz—common for lighting equipment, power electronics, renewable energy inverters, and medical devices. The dual 250 & 50 µH inductor design delivers stable, calibrated impedance across the entire 9 kHz–30 MHz band in a single instrument. A transient limiter such as the LIT-930A (9 kHz–30 MHz) is recommended for instrument protection.
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