How do I ensure good signal quality from DSI-Streamer?#

Use the DSI-Streamer application to verify electrode impedance and signal quality before starting your LSL stream or recording session.

Checking Signal Quality in DSI-Streamer#

Connect your headset and open DSI-Streamer. Enable the Diagnostic checkbox to display the signal quality metrics panel.

DSI-Streamer showing EEG and ECG signals

DSI-Streamer displaying live EEG and ECG signals#

With the Impedance checkbox enabled, DSI-Streamer injects a test signal into the data and reports impedance metrics for each electrode. Adjust each electrode’s contact with the scalp until all channels show green.

DSI signal quality metrics

Signal quality metrics panel in DSI-Streamer — green indicates good electrode contact#

Impedance thresholds:

Impedance

Rating

< 1,000,000 Ω (1 MΩ)

Good

< 2,000,000 Ω (2 MΩ)

Fair

> 2,000,000 Ω (2 MΩ)

Poor

Target good (green) impedance on all channels before recording.

Tips for Good Signal Quality#

  • Check impedance before each session. Use the Impedance checkbox to inject a test signal and view per-channel metrics. Adjust electrode contact until all channels read below 1 MΩ.

  • Seat the cap correctly. Make sure each electrode is positioned over the correct scalp location and making firm contact with the skin.

Where to Go Next#