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Passing EMC first time saves time, money, and stress. In this hands-on walkthrough, Dr Min Zhang (Mach One Design EMC) shows how to set up a conducted emissions bench that delivers results comparable to accredited labs — ideal for catching issues early in R&D.
What you’ll learn
- How to assemble a test ground plane — vertical + horizontal surfaces with secure, low-impedance joins.
- Correct grounding and placement of a LISN (Line Impedance Stabilisation Network).
- Ideal setup for DUT placement: 0.8 m table height, 0.4 m from vertical plane, and 1 m mains lead with controlled length hanging.
- How to configure a spectrum analyser for 150 kHz–30 MHz using a 9 kHz EMI resolution bandwidth.
- Avoiding missed or inaccurate measurements using sweep vs. segment-style software, or dedicated EMI receivers.
- Separating common-mode vs. differential-mode noise using a LISN Mate for targeted EMC debugging.
Safety & best practice: Earth the LISN casing, add an isolation transformer to prevent RCD trips — always terminate the unused LISN port with 50 Ω; use a transient limiter and compensate its insertion loss.
Equipment featured in the demo
Spectrum Analysers
Set up 150 kHz–30 MHz with 9 kHz EMI filters; add receiver or software tools for full CISPR compliance.
Browse Spectrum AnalysersVector Network Analysers (VNAs)
Characterise filters, chokes, and connectors used in CM/DM mitigation strategies.
Browse VNAsRoll-Up Ground Plane
Quick to assemble, safe to handle, and provides good electrical contact—no sharp edges, just rolls and fastens.
See Roll-Up Ground PlanesLISNs & LISN Mate
The essential interface for conducted emissions testing—provides reference impedance and allows CM/DM noise separation.
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