Test Records, Reporting, and Standards Interpretation
Test Records, Reporting, and Standards Interpretation tests whether the technician can produce defensible data and interpret it against the correct source. A report is not a list of numbers; it must identify the equipment, method, instrument, conditions, criteria, and conclusion. NETA ATS, manufacturer instructions, IEEE standards, and NFPA 70E each serve different purposes.
Core rules
- Record the instrument serial number, calibration due date, test voltage, duration, ambient temperature, humidity, and test method.
- State the acceptance criterion used: manufacturer data, NETA ATS, IEEE, or project specification. Do not mix criteria silently.
- Correct or qualify values for temperature when the standard requires it. Trend data over time is often more useful than a single pass/fail.
- Report anomalies, not just failures: a marginal reading, an unstable value, or a changed phase balance deserves comment.
- Keep raw data traceable to the final report and retain it per the quality system.
Worked example
A motor winding IR reading is 500 MΩ at 20 C, while the previous year was 1000 MΩ. The absolute value still passes a minimum criterion, but the trend has halved. The technician records temperature, humidity, test voltage, and instrument, then compares with the manufacturer minimum and prior corrected values. The reasoning is that a pass does not erase a significant downward trend; the report should flag it for investigation rather than declare the winding healthy.
Traps
Omitting temperature and calibration data; comparing readings taken at different test voltages; using the wrong standard as the acceptance criterion; copying previous results; and reporting only failures while hiding marginal trends.