When the current or the voltage whose form factor is not equal to π/2√2 is measured with the rectifire type indicating meter, an error is caused. The error for the current expressed in the form of i=
I1{1+a
nsin(
nx+φ
n)} is maximum or minimum in the next conditions.
n odd: φn=0 & φn=π, n even: φn=0 & φn=π/2. Errors in these cases have been calculated and shown in Fig. 3, 4 & 5. When an is small, the error in the case of even harmonic is smaller than in the case of odd one, but is not equal to zero. When n is larger than four, the value of the error is maximum and is about -10% when an in nearly equal to one.
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