UG-1098
ADE9000 Technical Reference Manual
Rev. 0 | Page 10 of 86
Note that for a given phase,
|
Current Channel Gain
×
Voltage Channel Gain
×
Power Gain
| ≤ 3.75
IB Calculation Using ICONSEL
Write the ICONSEL bit in ACCMODE to calculate IB = −IA − IC.
This setting can help save the cost of a current transformer in some
3-wire delta configurations. See the Applying the ADE9000 to a
3-Wire Delta Service section for more information.
High-Pass Filter
A high-pass filter is provided to remove dc offsets for accurate
rms and energy measurements.
high-pass filter on the current and voltage
channels is enabled by default. It can be disabled by writing the
DISPHPF bit in the CONFIG0 register equal to 1.
It is recommended to leave the high-pass filter enabled to
achieve the metering performance listed in the specifications
in the data sheet.
For some applications, it is desirable to increase the high-pass
filter corner, such as to improve performance when a Rogowski
coil current sensor is used.
The high-pass filter corner is selectable using the HPF_CRN bits
in the CONFIG2 register (see Table 6).
Table 6. HPF Corner Gain with 50 Hz Input Signal
HPF_CRN
f
−3 dB
(Hz)
HPF_GAIN
Settling Time to 1% for DC Step (sec)
Settling Time to 0.1% for DC Step (sec)
0
77.4
0.537
0.009
0.013
1
39.3
0.790
0.018
0.027
2
19.8
0.935
0.037
0.055
3
9.9
0.984
0.073
0.110
4
5.0
0.997
0.147
0.221
5
2.5
0.999
0.294
0.442
6 (default)
1.25
1.001
0.589
0.883
7
0.625
1.001
1.179
1.768