If you get a spike in the TDR measurement at 400ns, what are the probable reasons for that?

Question

Accepted Answer

A spike at 400ns in TDR measurements may indicate impedance mismatches or reflections in the transmission line.

Impedance mismatch: A sudden change in impedance can cause reflections, leading to spikes in TDR measurements.
Connector issues: Poorly connected or damaged connectors can introduce discontinuities, resulting in spikes.
Cable defects: Faulty cables, such as those with breaks or shorts, can create reflections that manifest as spikes.
Grounding problems: Inadequate grounding can lead to noise and reflections, causing unexpected spikes in the TDR signal.
Environmental factors: External electromagnetic interference (EMI) can also affect TDR readings, leading to spikes.

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