https://standards.iteh.ai/catalog/standards/iec/56c4de94-e529-4cab-abfd-11af5c055a8b/iec-61557-9-1999
IEC 61557-9:1999 - Insulation Fault Location for IT Electrical Systems
IEC 61557-9 defines requirements for insulation fault location in low voltage IT systems up to 1000 V a.c. and 1500 V d.c., enhancing safety and system
fault locationfor itiecinsulation
https://techmaster.us/insulation-tester-calibration/
Insulation Tester Calibration According to IEC 61557-2 & IEEE 43 - Techmaster Electronics
insulation tester calibrationaccording to