Cirrus Logic AN362 - Manual (Page 3)

AN362
AN362REV1 3
3. Accuracy Test with Rogowski Coil, U
n
= 240V and I
b(max)
= 2(80A) at 50Hz
Pulse PA3202NL is used as the current sensor. The secondary output voltage of PA3203NL is 416μV/A at
50Hz. When the meter is applied with the maximum load current, I
max
= 80A, the Rogowski coil secondary out-
put is approximately 33mV
RMS
, which is below the CS5480 maximum I-channel input range when setting the
PGA for current channel 1 (I1) to 50x.
High-pass filter (HPF) is enabled on the voltage channel: V1FLT[1:0] = ‘01’
Integrator is enabled on the current channel: I1FLT[1:0] = ‘11’
Figure 2. Connection between Rogowski Coil and CS5480
CS5480
IIN 1-
IIN 1+
27nF
27nF
1KΩ 100Ω
1KΩ 100Ω
27nF
27nF
V+
V-
GND GND
IIN1-
IIN1+
J1
Rogowski Coil
PA3202 NL
Current