Record and review a session

Connect the Viewer and confirm healthy status, correct calibration, plausible values, and adequate disk space before starting a capture. Select Record, choose a new destination, and observe duration, file size, and buffer use.

A bounded queue isolates acquisition from storage latency. The Viewer never silently discards an accepted row: overflow or write failure ends recording explicitly. Data is first written to <name>.csv.partial; clean stop drains and flushes all accepted rows and atomically promotes the destination to .csv.

Pause and resume

Pause freezes numeric values and plots. During recording it first drains and flushes accepted CSV rows, then suspends CSV acceptance. Connection and health monitoring continue.

Resume clears the paused chart window and accepts only new samples. Samples received during pause are not replayed, so the CSV contains an intentional elapsed-time gap. Pause is therefore a recording control, not only a display control.

Verify the file

Before a long capture, record a short controlled session and verify:

• the destination is on the intended filesystem;
• stopping produces .csv, not .csv.partial;
• the final row is complete;
• elapsed recording time is monotonic;
• unit and configuration revision accompany each scaled wrench;
• sample count is plausible for duration and RDT rate;
• a known controlled load appears on the expected axis and sign.

If a partial file remains, preserve it and inspect only complete rows. Check interruption, queue overflow, writer errors, disk space, permissions, and removable-media stability. A manually renamed partial file is not evidence of a complete requested capture.

See Viewer CSV for exact fields and timestamp semantics.