ISN / CDN for 75 Ohm Coaxial Cable
- ▸ Impedance Stabilization Network (ISN) for 75 Ω coaxial cables — measures common-mode conducted emissions on 75 Ω coax (CATV, broadcast, video) per EN 55022/32 (CISPR 22/32) and CISPR 16-1-2. ISN role typically applied 150 kHz–30 MHz.
- ▸ 150 Ω common-mode termination per CISPR 22/32 — standard-defined impedance presented to the EUT so disturbance voltage at the measurement port is stable and repeatable.
- ▸ 75 Ω BNC EUT and AE ports — direct mate to standard video / CATV coax interfaces.
- ▸ Cable TV, broadcast, and head-end equipment — set-top boxes, cable modems, RF distribution amplifiers, and broadcast monitors with 75 Ω ports.
- ▸ Video distribution and surveillance — analog/HD-SDI receivers, CCTV head-ends, and other 75 Ω RF or baseband video applications.
- ▸ 50 Ω BNC measurement port on top of housing — direct mate to spectrum analyzer / EMI receiver.
- ▸ Also usable as a CDN for IEC/EN 61000-4-6 conducted immunity — secondary capability over the full 150 kHz–230 MHz band when needed.
- ▸ Individually calibrated; unpainted bottom surface bonds directly to the reference ground plane — three-year warranty; pairs with the SPA-900TG series spectrum analyzer / EMI receiver.
ISN/CDN-C75E Features
- ▸ ISN for conducted emissions on 75 Ω coaxial ports — per EN 55022/32 (CISPR 22/32)
- ▸ Meets CISPR 16-1-2 — measurement equipment specification
- ▸ Frequency range 150 kHz to 30 MHz (ISN, emissions)
- ▸ Frequency range 150 kHz to 230 MHz (CDN, immunity)
- ▸ 75 Ω BNC EUT and AE connectors — standard video/CATV coax interfaces
- ▸ 150 Ω common-mode impedance — per CISPR 22/32 ISN specification
- ▸ Voltage division factor 9.5 dB (+3 / −1)
- ▸ Decoupling of common-mode disturbance ≥ 40 dB (EUT/AE)
- ▸ 50 Ω BNC (female) measurement port — direct mate to spectrum analyzer / EMI receiver
- ▸ 1 A maximum EUT current rating
- ▸ Unpainted bottom surface — effective bond to the reference ground plane
- ▸ Also functions as a CDN for IEC/EN 61000-4-6 immunity — same unit, 150 kHz–230 MHz
- ▸ Individually calibrated; integrates with the CIS series conducted immunity test system
- ▸ Three-year warranty
ISN/CDN-C75E Specifications
| Parameter | Specification |
|---|---|
| Model | CDN-C75E |
| Primary Role | Impedance Stabilization Network (ISN) — 75 Ω coaxial |
| Applicable Standards (ISN) | EN 55022/32, CISPR 22/32, CISPR 16-1-2 |
| Secondary Role | Coupling/Decoupling Network (CDN) for IEC/EN 61000-4-6 immunity |
| Frequency Range (ISN, emissions) | 150 kHz to 30 MHz |
| Frequency Range (CDN, immunity) | 150 kHz to 230 MHz |
| Cable Type | 75 Ω coaxial |
| EUT / AE Connectors | 75 Ω BNC (female) |
| Measurement / RF Port | 50 Ω BNC (female) |
| Common-Mode Impedance | 150 kHz–26 MHz: 150 Ω ± 20 Ω 26–80 MHz: 150 Ω +60/−45 Ω 80–230 MHz: 150 Ω +60/−60 Ω |
| Voltage Division Factor (VDF) | 9.5 dB (+3 / −1) |
| Decoupling (Common Mode) | ≥ 40 dB (EUT/AE) |
| Voltage Rating (Line to Ground) | 310 V AC / 440 V DC |
| Current Rating (max) | 1 A |
| RF Input Voltage (max, CDN mode) | 40 Vrms |
| Dimensions | 6 × 6 × 13 in (15.2 × 15.2 × 33 cm) |
| Weight | 5 lbs (2.3 kg) |
| Bottom Surface | Unpainted — bonds directly to ground reference plane |
| Calibration | Individual calibration included |
| Warranty | 3 years |
Secondary use (CDN): Same unit also functions as a coupling/decoupling network for IEC/EN 61000-4-6 immunity testing — ADA-C50/C75 shorting adapters, ADA-515-2 150/50 Ω adapters, TEP-050 terminator, ATTN-6-100W attenuator, DCU-300-100W coupler, and ACS-series amplifiers complete the immunity setup.
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