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In an ideal world the output from the AC sensing circuit would be proportional to
the AC current and voltage at its input for all voltage and current levels (within a
certain random accuracy).
In practice, the un-calibrated accuracy can vary as a function of the voltage or
current level (this is called a slope error) and/or be offset by a fixed amount
(offset error). This is shown in Figure 1 to Figure 3 below.
The point of calibration is to make the measured current and voltage equal to the
input voltage and current within a certain random error tolerance.
Pivot Point
1. Calibration Theory
Error varies with
voltage/current level.
Measured Voltage/Current
Figure 1 – Pure slope error.
Constant error
Measured Voltage/Current
Figure 2 – Purse offset error.
3 of 18
Pre-
calibrated
curve
Ideal Curve
Pre-
calibrated
curve
Ideal Curve