5.1.2 Current
Shunt module is needed when SPM90 measures the current. The shunt is
actually a resistor with very small resistance. Voltage appears when there is
current running through, which can be shown on ampere meter. Shunt
specifications: 100A, 150A, 200A, 300A，400A.
Note: If “I ERR A” is displayed when the meter accessed load, then it
means that wires on the port 3 and 4 are reversely connected.
5.2 Energy Parameters
The maximum energy SPM90 can measure is 999999.999, with three
decimal places. When it reaches the maximum value, it automatically turns
over to 0.
5.3 Electric Energy Pulse
Pulse width fixes at 90ms, pulse constant is 100imp/kWh.
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