STPMS2

Applications

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6

Applications

The choice of external components is a crucial point in the application design, affecting the

precision and the resolution of the entire system. Among the several considerations, a

compromise should be found among the following requirements:

1.

Maximize the signal-to-noise ratio in the voltage and current channel.

2.

calibration can be achieved.

3.

the desired maximum current and resolution.

To maximize the signal-to-noise ratio of the current channel, the voltage divider resistor

ratio should be as close as possible to those shown in Table 6. Figure 4 below provides a

reference application schematic diagram:



P = 64000 imp/kWh





Typical sensitivity values for the current sensors are indicated in Table 6: "Recommended

external components in metering applications".

Figure 4: Detailed application schematic