Measure and record the voltage (V2) between the positive side of the high voltage bus and the electrical chassis (see Figure 1); If V1 is greater than or equal to V2, insert a standard known resistance (Ro) between the negative side of the high voltage bus and the electrical chassis. With Ro installed, measure the voltage (V1’) between the negative side of the high voltage bus and the vehicle electrical chassis (see Figure 3). Calculate the isolation resistance (Ri) according to the formula shown below.
Mérjük meg a nagyfeszültségű sín negatív és pozitív pólusa közötti feszültséget (Vb), és jegyezzük fel (lásd az 1. ábrát).