Adrian Martin — Hardware Engineering BlogMeasurements, experiments and technical insights from the lab.https://adrianmartin.de/Don't Route Over Ground Plane Splits — Part 5: Compliancehttps://adrianmartin.de/en/blog/chamber-test-ground-plane-splits/https://adrianmartin.de/en/blog/chamber-test-ground-plane-splits/Took the same three boards to an accredited EMC lab. The split board fails Class B by 26.8 dB. The stitching caps recover 25 dB but still fail by 1.8 dB. Only the intact plane passes.Wed, 06 May 2026 00:00:00 GMTBefore the Poor Man's Scanner Gets Retiredhttps://adrianmartin.de/en/blog/before-the-poor-mans-scanner-gets-retired/https://adrianmartin.de/en/blog/before-the-poor-mans-scanner-gets-retired/One last experiment with the DIY near-field scanner: a 90° wire bend over a ground plane, scanned with H and E probes in multiple orientations.Tue, 10 Mar 2026 00:00:00 GMTDon't Route Over Ground Plane Splits — Part 4: Poor Man's 3D Field Patternshttps://adrianmartin.de/en/blog/3d-field-patterns/https://adrianmartin.de/en/blog/3d-field-patterns/3D terrain maps of the H-field above the test boards. Amplitude becomes topography: tall mountains mean strong fields. All three boards on the same scale.Tue, 03 Mar 2026 00:00:00 GMTDon't Route Over Ground Plane Splits — Part 3: The Loop and Its Areahttps://adrianmartin.de/en/blog/near-field-scanning-ground-plane-splits/https://adrianmartin.de/en/blog/near-field-scanning-ground-plane-splits/A DIY near-field EMC scanner built from a Snapmaker A350 and a Siglent spectrum analyzer reveals the emission pattern of ground plane splits — frequency by frequency, overlaid on the actual board photos.Tue, 17 Feb 2026 00:00:00 GMTDon't Route Over Ground Plane Splits — Part 2: Immunityhttps://adrianmartin.de/en/blog/routing-over-ground-plane-splits-immunity/https://adrianmartin.de/en/blog/routing-over-ground-plane-splits-immunity/Part 1 showed that a split ground plane radiates more. Now we flip it around: how much RF does the board pick up? Same test boards, same TEM cell — but this time the signal source feeds the cell and the board is the receiver.Tue, 03 Feb 2026 00:00:00 GMTDon't Route Over Ground Plane Splits — Part 1: Emissionshttps://adrianmartin.de/en/blog/routing-over-ground-plane-splits-measured/https://adrianmartin.de/en/blog/routing-over-ground-plane-splits-measured/Everyone says not to route traces over splits in ground planes. Two custom microstrip test boards, a TEM cell, and a spectrum analyzer show you exactly what happens when you do.Tue, 20 Jan 2026 00:00:00 GMTFFT Analysis of an EFT/Burst Pulse Trainhttps://adrianmartin.de/en/blog/fft-analysis-eft-burst-pulse-train/https://adrianmartin.de/en/blog/fft-analysis-eft-burst-pulse-train/Capturing a full EFT burst train with an oscilloscope, replaying it in LTspice, and comparing the frequency spectrum at 5 kHz and 100 kHz repetition rates.Tue, 06 Jan 2026 00:00:00 GMT