Fluke 1537-II - Principle of Measurement and Resistance

32
1535/1537/1537-II
Users Manual
Principle of Measurement and Resistance
The Tester uses these formulas to measure insulation parameters and display
the results:
Ohm’s Law
I
V
R =
Capacitance
(Charge)
V
Q
C 
PI
(Polarization Index)
min1
min10
R
R
PI =
DAR
(Dielectric Absorption Ratio)
s
R
R
DAR
30
min1

s
R
R
DA
R
15
min1

[CN]
DD
(Dielectric Discharge)
CV
I
DD
×
=
I = current after 1-minute discharge
V = voltage before discharge
C = measured object capacitor