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The automatic insulation resistance tester with PI and DAR measurement is designed for advanced insulation condition assessment of electrical equipment. In addition to conventional insulation resistance measurement, compatible models automatically calculate the Polarization Index (PI) and Dielectric Absorption Ratio (DAR) based on resistance readings taken at specified time intervals.
These diagnostic ratios provide additional information about the insulation characteristics of transformers, electric motors, generators, and other electrical equipment. By reducing the need for manual timing and calculation, automatic PI and DAR measurement improves testing convenience and helps technicians maintain consistent inspection records.
The instrument is particularly suitable for professional electrical maintenance departments, power utilities, industrial plants, and testing laboratories.
PI is generally calculated by dividing the insulation resistance measured after 10 minutes by the resistance measured after 1 minute.
DAR is commonly calculated using insulation resistance readings taken at 60 seconds and 30 seconds, although test procedures may use different time intervals.
They provide additional information about insulation characteristics and can support insulation condition assessment when interpreted alongside other test data.
No. These functions are available only on models specifically equipped with the corresponding diagnostic measurement modes.
Yes, if the selected model includes automatic PI and DAR calculation functions.
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