SA9103C
8. Calibration
For the calibration of the SA9103C, the following procedure is recommended:
a. Establish calibration factor for active energy (Ka) at pf close to 1.
Active (Measured) = register_value (Active) * Ka.
1
b. The factor for reactive (Kr) is typically Ka * PI/2.
For higher accuracy of Kr, establish Kr at pf close to 0.
Reactive (Measured) = register_value (Reactive) * Kr
2
c. At pf close to 1, establish error for reactive (Er)
Er = (Reactive (Measured) - Reactive (True)) / Active (Measured)
3
Reactive (Corrected) = Reactive (Measured) - Er * Active (Measured) 3b
Measurement
Having determined the scaling factors (Ka & Kr) and error correction constant (Er)
the measurement cycle consists of the following steps:
step 1
step 2
Read active register
∨
Calculate Active (Measured) as per 1
step 3
step 4
∨
Read reactive register
∨
Calculate Reactive (Measured) as per 2
step 5
∨
Perform error correction
Calculate Reactive (Corrected) as per 3b
⇒ Active energy
⇒ Reactive energy
The above five steps must be performed for each measurement cycle.
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