The purpose of this article is to explain the reason for getting ERR results using the Fluke-1587FC.
As well as the Insulation Test the Fluke-1587FC and Fluke-1507 can perform the Polarization Index Test (PI) and Dielectric Absorption Ratio Test (DAR).
The DAR test is an overall one-minute test and compares two readings one at the 30 second point and the other at the 60 second point and the results are a ratio between the two measurements.
The PI test is an overall 10-minute test and compares two readings one at the 1-minute point and the other at the 10-minute point and the results are a ratio between the two measurements.
When the results are higher than 1.6 for the DAR test or higher than 4 for the PI test the Fluke-1587FC will show ERR (see table below).