3.1.28 Current Channel Magnitude Calibration Constants
Multiplicative magnitude calibration constants are provided for each current channel to equalize gain across all channels after an appropriate calibration procedure was exercised. All active input channels, both voltage and current, require final calibration to ensure full accuracy.
CAL_M_Ix: where x = [A, B, C or N] is used to calibrate the current channels.
Where,
- Ix_RMS is the ideal RMS value of input calibration current
- ACC_I_x is the 64-bit accumulated I2-scaled quantities provided by metrology firmware
- N = The number of samples in the integration period provided in Metrology Status Registers
Refer to the “PIC32CXMTx Metrology User Guide” (DS50003460) for additional information.
Warning: Be aware that this conversion factor is a
signed quantity. Assigning a negative value results in an effective phase shift
rotation of 180º, which can be particularly useful in specific scenarios, such as
certain meter configurations or when dealing with inverted wiring polarity.
| Name: | CAL_M_Ix |
| Property: | Read-Write |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| CAL_M_Ix[31:24] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| CAL_M_Ix[23:16] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| CAL_M_Ix[15:8] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| CAL_M_Ix[7:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |