Motor IR / DAR / Polarization Index Test Record

Motor insulation resistance testing is one of the most common NETA maintenance measurements — but properly documenting it requires capturing the 1-minute spot reading, the 30-second and 1-minute readings for DAR calculation, and the 1-minute and 10-minute readings for Polarization Index, all corrected to a 40°C reference temperature using the IEEE 43 Kt factor. This record handles the complete test suite. The evaluation mode is selectable: Worksheet (custom or manual thresholds), NETA ATS (motor acceptance), NETA MTS (motor maintenance), or IEEE 43-2013 reference. Winding category determines the minimum IR basis per IEEE 43-2013: post-1970 form-wound AC/DC armature windings (minimum 100 MΩ at 40°C), random-wound stator or form-wound below 1 kV (minimum 5 MΩ), or custom. PI and DAR threshold values are user-configurable. Full motor nameplate documentation covers manufacturer, serial number, frame, type, horsepower, kW rating, voltage, phase, frequency, full-load current, locked-rotor current, service factor, power factor, temperature rise, insulation class, NEMA design, shaft diameter, weight, thermal protection status, connected equipment, and listing. Temperature correction applies the Kt factor (automatic from IEEE 43 lookup or manual override) to correct measured MΩ to 40°C reference. Range multiplier selection handles instruments that output in kΩ, MΩ, or GΩ. Pre-test verification items confirm guard terminal usage, discharge time completion, and test lead condition. Audible interval prompts are available to cue the technician at the 30-second, 1-minute, and 10-minute marks during timed testing. The record closes with comments and observations, deficiencies noted, test conclusion and recommendation, and dual technician and reviewer signature blocks with dates. Status tracking: In Progress, Complete-Pass, Complete-Fail, Incomplete. Data saves to localStorage, exports and imports as JSON, and prints to PDF.

• 01Identify the correct IEEE 43-2013 winding category and minimum IR acceptance value for form-wound and random-wound motor windings and explain why the minimums differ
• 02Apply the Kt temperature correction factor to normalize insulation resistance readings to the 40°C reference temperature specified by IEEE 43
• 03Calculate Polarization Index (10-minute reading ÷ 1-minute reading) and Dielectric Absorption Ratio (1-minute ÷ 30-second reading) and evaluate results against IEEE 43 and NETA threshold values
• 04Document complete motor nameplate data — including insulation class, temperature rise, service factor, and locked-rotor current — and explain how these values provide context for interpreting insulation test results
• 05Apply the correct evaluation mode — NETA ATS for acceptance, NETA MTS for maintenance, or IEEE 43-2013 reference — and explain how acceptance thresholds differ between new-installation and in-service testing
• 06Use audible interval prompts for timed readings, confirm pre-test verification items (guard terminal, discharge, lead condition), and document findings with test conclusion, deficiencies, and dual-signature review

Record a PI test and interpret the trend.

No sign-in required. Progress is saved on this device.

• —Not a design document, stamped calculation, or approval record.
• —Not a substitute for engineering analysis by a licensed professional.
• —Not an accredited test report — it is a NETA-aligned educational field workflow, and acceptance decisions stay with the responsible test organization.
• —Not connected to live equipment and not a safety device.