Rohde and Schwarz ENY22 Coupling Network / LISN

The Rohde & Schwarz ENY22 is a double 2-wire coupling network designed to measure asymmetrical (common-mode) radio frequency interference voltage on unshielded symmetrical telecommunication ports. It operates across 150 kHz to 30 MHz for conducted emission measurements, extending to 80 MHz for conducted immunity testing.

Technical Specifications

• Frequency Range: 150 kHz to 30 MHz (emissions); 150 kHz to 80 MHz (immunity testing)


• Network Configuration: Double 2-wire with two receiver ports


• Termination Impedance: 150 Ω asymmetrical/common-mode


• Symmetrical Impedance: 100 Ω


• Voltage Division Factor: 10 dB typical (150 kHz to 30 MHz: ±1 dB; 30 MHz to 80 MHz: ±3 dB)


• Transfer Bandwidth: Up to 100 MHz for symmetrical impedance of 100 Ω


• Standards Compliance: CISPR22, EN55022 (emissions); CISPR24, EN55024, IEC61000-4-6 (immunity); tested and calibrated to CISPR/A/307/CD

Key Features The ENY22 couples asymmetrical impedance to the test receiver via 10 dB voltage division while allowing useful symmetrical (differential-mode) signals to pass with minimal attenuation. The coupling network isolates the test circuit from interference effects at the auxiliary equipment port. Adapter sets are available in Type V (RJ45 connectors) and Type VI (screw-on connections) configurations to meet specific Longitudinal Conversion Loss requirements and various telecommunication standards.

Typical Applications The ENY22 works with conducted emission measurements and immunity testing on telecommunications equipment. It enables selective measurement of common-mode interference independent of differential-mode signals, supporting standards-based compliance verification for CISPR and EN/IEC protocols.

Compatibility & Integration The unit is housed in a single enclosure with two receiver ports. Adapter set availability allows integration with different connector types and impedance matching requirements across diverse test setups.