Investigate a signal in Historian
Use a bounded time range and retain data-quality context.
Before using this guide
Confirm your site, role and source revision. Follow the local procedure and responsible engineer for physical actions.
A reproducible investigation
- Select the correct site, asset and signal code.
- Choose a time range tied to the event, shift or production run.
- Inspect gaps, quality changes and timestamp alignment before comparing values.
- Keep the unit and any scaling change with your notes.
- Export or cite the exact range used in your finding.
Common interpretation errors
Check before proceeding
- Do not interpolate across an unexplained data gap.
- Compare counters and rates only after confirming reset and unit behavior.
- A correlation in a trend is a hypothesis, not proof of cause.