FED-STD-228A
GALVANOMETER
GALV
SHUNT
KNOWN
RESISTANCE
C
B
A
FIGURE 6031
5. RESULTS
5.1 Calculation.
5.1.1 The resistance of the insulation per 1,000 feet shall be calculated as follows:
R = K L F______
1,000 (DS-ds)
where:
R=the resistance of the insulation in megohms for 1,000 feet.
K=the galvanometer constant as described in 4.7.
L=the length of specimen in feet.
D=the galvanometer scale deflection in divisions for the specimen.
d=the galvanometer scale deflection in divisions for the leakage reading.
S=the shunt constant for the deflection observed for the specimen reading.
s=the shunt constant for the deflection observed for the leakage reading.
F=the temperature correction factor (table I).
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