Fisher Coupling Decoupling Networks (CDN)
Fischer Coupling Decoupling Networks (CDNs) are designed to inject controlled common mode disturbance signals into equipment under test (EUT) for EMC immunity testing in accordance with relevant international standards. These networks enable the disturbance signal to be coupled onto a wide range of cable types, including unscreened cables, shielded cables, balanced lines, coaxial cables and power mains.
A decoupling network is used between the EUT and any associated auxiliary equipment to ensure that the applied disturbance signal does not affect the operation or performance of the auxiliary equipment during testing. By isolating the disturbance path, the CDN helps maintain the integrity and accuracy of the test set-up.
Fischer CDNs are engineered to provide reliable and repeatable performance across a variety of applications, supporting consistent and standards-compliant immunity testing. EMC Hire Ltd can advise on the most suitable CDN configuration for your requirements, with datasheets available on request.
Fischer Coupling Decoupling Networks Datasheet Links
| Product | Model | Common Mode Impedance | Disturbance Coupling Circuit | EUT/AE Port | I/O Connections | Insertion Loss | Voltage Attenuation |
|---|---|---|---|---|---|---|---|
| Series AF | FCC-801-AF2 FCC-801-AF3 FCC-801-AF4 FCC-801-AF8 FCC-801-AF9 FCC-801-AF15 |
150 kHz - 26 MHz: 150+20ohm 26MHz - 80MHz: 150+60/-45ohm 80MHz - 230MHz: 150+60/-60ohm | Freq: 150kHz - 230MHz Connector: 50ohmBNC RF Voltage: | AC Voltage: | Audio Socket, D-Sub series, Multi-Contact, Safety Socket | 30dB at 150 kHz >20dB at 230 MHz | 10dB+1dB/-3dB |
| Series C | FCC-801-C1-BNC-50 FCC-801-C1-BNC-75 |
150 kHz – 26 MHz: 150+20Ω, 26MHz – 80MHz: 150+60/-45Ω, 80MHz – 230MHz: 150+60/-60Ω | Connector: 50ΩBNC, Freq: 150kHz – 230MHz, RF Voltage: ≤ 30V: | AC Voltage:, Current: 1 Ampere, DC Voltage: | BNC, Type-N | < 1dB at 230MHz | 10dB+1dB |
| Series M | FCC-801-M1-25A-1 FCC-801-M1-32A-1 FCC-801-M1-50A-1 FCC-801-M1-100A-1 FCC-801-M2-16A-10kHz FCC-801-M2-16A FCC-801-M2-25A FCC-801-M2-32A FCC-801-M2-50A FCC-801-M2-100A-1 FCC-801-M2-125A FCC-801-M2-200A-1 FCC-801-M2-M3-16A FCC-801-M3-16A FCC-801-M3-25A FCC-801-M3-32A FCC-801-M3-50A FCC-801-M3-75A FCC-801-M3-100A-1 FCC-801-M3-200A-1 FCC-801-M4-16A FCC-801-M4-25A FCC-801-M4-32A FCC-801-M4-50A FCC-801-M4-100A-2 FCC-801-M4-200A-1 FCC-801-M5-16A FCC-801-M5-25A FCC-801-M5-32A FCC-801-M5-50A FCC-801-M5-75A FCC-801-M5-100A-1 FCC-801-M5-200A-1 |
150 kHz - 26 MHz: 150+20ohm 26MHz - 80MHz: 150+60/-45ohm 80MHz - 230MHz: 150+60/-60ohm; | Freq: 150kHz - 230MHz Connector: 50ohmBNC RF Voltage:: | AC Voltage: | Multi-Contact Safety Sockets | < 0.1dB up to 400 MHz 45dB at 150 kHz | 10dB+1dB/-3dB |
| Series S | FCC-801-S-USB2_0 FCC-801-S-USB3_0 FCC-801-S2 FCC-801-S4 FCC-801-S8-RJ45 FCC-801-S8 FCC-801-S9 FCC-801-S15 FCC-801-S19-HDMI FCC-801-S25 FCC-801-S37 |
150 kHz - 26 MHz: 150+20ohm 26MHz - 80MHz: 150+60/-45ohm 80MHz - 230MHz: 150+60/-60ohm; | Freq: 150kHz - 230MHz Connector: 50ohmBNC RF Voltage: | AC Voltage: | D-Sub min, S2 to S50, USB | < 3dB up to 20KHz < 10dB at 1 MHz < 20dB up to 10MHz | 10dB+1dB/-3dB |
| Series T | 600156-FCC-801-T8-SRJ45 600155-FCC-801-T4-RJ45 600050-FCC-801-T8-SRJ45 600167-FCC-801-T2-RJ11 F-090407-1004-1A F-121221-1004-1_10GB-CDN-1 F-140714-1004-1 |
150 kHz - 26 MHz: 150+20ohm 26MHz - 80MHz: 150+60/-45ohm 80MHz - 230MHz: 150+60/-60ohm; | Freq: 150kHz - 230MHz Connector: 50ohmBNC RF Voltage: | AC Voltage: 100V Current: 400 milliamperes | RJ 11, RJ 45 | < 3dB at 100 MHz | 10dB+1dB/-3dB |
Frequently Asked Questions
What are CDNs used for?
CDNs are used to inject controlled disturbance signals into equipment for EMC immunity testing.
Why is decoupling important?
Decoupling ensures auxiliary equipment is not affected by the injected disturbance signal, maintaining test integrity.
Can EMC Hire help select the right CDN?
Yes. EMC Hire can advise on suitable CDN configurations and provide datasheets for your application.
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