71M6521DE Datasheet, PDF (88/107 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/DH/FE Data Sheet
CE Calibration Parameters
The table below lists the parameters that are typically entered to effect calibration of meter accuracy.
CE
Address
0x08
0x09
0x0A
0x0B
Name
CAL_IA
CAL_VA
CAL_IB
CAL_VB
0x0C
PHADJ_A
0x0D
PHADJ_B
Default
16384
16384
16384
16384
0
0
Description
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).
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:
PHADJ _ X = 2^{20 0.02229 ⋅TANΦ at 60Hz}
0.1487 − 0.0131⋅TANΦ
PHADJ _ X = 2²⁰
0.0155 ⋅ TANΦ
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
0x13
Name
QUANTA
0x18
QUANTB
0x15
QUANT_VARA
0x1B
QUANT_VARB
0x16
QUANT_I
Default
0
0
0
0
0
Description
This parameter is added to the Watt calculation for element 0 to compensate
for input noise and truncation.
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.
This parameter is added to the VAR calculation for element A to compensate
for input noise and truncation.
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
Page: 88 of 107
Rev 2