71M6521DE/71M6521FE
Energy Meter IC
DATASHEET
JANUARY 2008
CE Calibration Parameters
The table below lists the parameters that are typically entered to effect calibration of meter accuracy.
CE
Address
Name
Default
Description
0x08
CAL_IA
CAL_VA
CAL_IB
CAL_VB
16384
16384
16384
16384
These constants control the gain of their respective channels. The nominal
value for each parameters is 214 = 16384. The gain of each channel is directly
proportional to its CAL parameter. Thus, if the gain of a channel is 1% slow,
CAL should be scaled by 1/(1 – 0.01).
0x09
0x0A
0x0B
These two constants control the CT phase compensation. No compensation
occurs when PHADJ_X = 0. As PHADJ_X is increased, more compensation
(lag) is introduced. Range: ±215 – 1. If it is desired to delay the current by the
angle Φ:
0x0C
0x0D
PHADJ_A
PHADJ_B
0
0
0.02229 ⋅TANΦ
0.1487 − 0.0131⋅TANΦ
0.0155⋅TANΦ
PHADJ _ X = 220
at 60Hz
PHADJ _ X = 220
at 50Hz
0.1241− 0.009695⋅TANΦ
Other CE Parameters
The table below shows CE parameters used for suppression of noise due to scaling and truncation effects.
CE
Address
Name
Default
Description
This parameter is added to the Watt calculation for element 0 to compensate
for input noise and truncation.
0x13
QUANTA
0
0
0
0
LSB = (VMAX*IMAX / In_8) *7.4162*10-10
W
This parameter is added to the Watt calculation for element 1 to compensate
for input noise and truncation. Same LSB as QUANTA.
0x18
0x15
0x1B
QUANTB
This parameter is added to the VAR calculation for element A to compensate
for input noise and truncation.
QUANT_VARA
QUANT_VARB
LSB = (VMAX*IMAX / In_8) * 7.4162*10-10
W
This parameter is added to the VAR calculation for element B to compensate
for input noise and truncation. Same LSB as for QUANT_VARA.
This parameter is added to compensate for input noise and truncation in the
squaring calculations for I2. QUANT_I affects only I0SQSUM and I1SQSUM.
LSB = (IMAX2/In_82)*7.4162*10-10 A2
0x16
QUANT_I
0
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