Microchip Technology ARD00330 データシート
Energy Monitoring PICtail™ Plus Daughter Board User’s Guide
DS51933A-page 26
© 2011 Microchip Technology Inc.
3.23
I_ABS_MAX
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
3.24
V_ABS_MAX
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
3.25
ENERGY_REACT
The design updates the reactive energy registered using the CF Pulse blink output
count too. In this method, the Energy registers increments every pulse by a value equal
to 1/(METER_CONSTANT).
count too. In this method, the Energy registers increments every pulse by a value equal
to 1/(METER_CONSTANT).
ENERGY_REACT = ENERGY_REACT + (1/METER_CONSTANT)
The gain calibration registers GAIN_NUMR_ENERGY_ACT and
GAIN_DENR_ENERGY_ACT hold good for this method also.
GAIN_DENR_ENERGY_ACT hold good for this method also.
3.26
PHASE_COMPENSATION
Phase delay, signed 8-bit value, provides the phase compensation by sampling time/2.
3.27
OFFSET_I_RMS
Square of the offset for RMS current reading, signed 16-bit value. Note that this value
should be similar to the ADC’s noise squared. At a gain of 1, the noise will be about
1 LSB, 2 LSBs at a gain of 2, 6 LSBs at a gain of 8, 11 LSBs at a gain of 16, and
22 LSBs at a gain of 32. There may be other sources of noise. Using the square of the
offset allows for higher accuracy. The value will be added before the square root is
taken when calculating the final RMS value.
should be similar to the ADC’s noise squared. At a gain of 1, the noise will be about
1 LSB, 2 LSBs at a gain of 2, 6 LSBs at a gain of 8, 11 LSBs at a gain of 16, and
22 LSBs at a gain of 32. There may be other sources of noise. Using the square of the
offset allows for higher accuracy. The value will be added before the square root is
taken when calculating the final RMS value.
Name
Bits
Cof
I_ABS_MAX
8
R
Name
Bits
Cof
V_ABS_MAX
8
R/W
Name
Bits
Cof
ENERGY_REACT
32
R
RAW_ENERGY_REACT
64
R
Name
Bits
Cof
PHASE_COMPENSATION
8
R/W
Name
Bits
Cof
OFFSET_I_RMS
16
R/W