Insulation resistance measurement in UM11328 document

[guxiaoliang]

Insulation resistance measurement

formula   Riso-//=(R3+R4)=Rref*(1+U2/U1)*【（U1-U1`/U1`）】

  //=     What does it mean 

How is this formula derived

[TomasVaverka]

Hi,

Feedback from the author of the UM11328:

This is a typo, the formula needs to corrected like this:

Sorry for the confusion.

Best regards,

Tomas