SA9103CPA Ver la hoja de datos (PDF) - South African Micro Electronic Systems

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SA9103CPA

SINGLE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH SERIAL INTERFACE

South African Micro Electronic Systems 

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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