Previously we talked about this sensor and made an example of how to use it you can see here. But if you want to * create your own circuit for measuring different values of maximum power*, you can use this guide to help you to assign the values of R

_{1}and R

_{BURDEN}.

First we must establish what are the characteristic values of the signal power that will measure the * SCT-013-000 sensor*. These values are

*and*

**V**_{RMS}*.*

**frequency**Country | V_{RMS} |
Frequency |
---|---|---|

Argentina | 220 V | 50 Hz |

Australia | 230 V^{} |
50 Hz |

Canada | 120 V | 60 Hz |

Chile | 220 V | 50 Hz |

China | 220 V | 50 Hz |

France | 230 V | 50 Hz |

Germany | 230 V | 50 Hz |

Italy | 230 V | 50 Hz |

Mexico | 127 V | 60 Hz |

Netherlands | 230 V | 50 Hz |

Russia | 230 V | 50 Hz |

South Korea | 220 V | 60 Hz |

Spain | 230 V | 50 Hz |

United Kingdom | 230 V | 50 Hz |

United States | 120 V | 60 Hz |

Next we need the values of the sensor * SCT-013-000*.

: It gives us the relationship between the signal measured by the sensor and the signal is giving us at the output.**Output Mode**: range of values of current sensor can measure.**Input Current**

This values are:

This means that the * maximum current that can be measured is 100 A*. If we have a

*(15556.35 Watts in the case that the V*

**120V V**_{RMS}maximum power will be 8485.28 Watts_{RMS}is 220V). If you need to measure

*.*

**values above these we have to opt for another sensor**In addition to the maximum current that can be measured (* 100A*), the sensor will give us

*this leads to other limitations. For example as normal it is that we opt for a resistor*

**3.3A***, where:*

**1/4 Watt**This limits the maximum power that can be measured with this type of resistance to * 117.85 Watts for a 5V Vref* (178.56 Watts for a 3.3V Vref).

The value of the resistors * R_{1}* must be much higher than

*around 100 times, if opted for a*

**R**_{BURDEN}*then*

**R**_{BURDEN}100 Ω*will be*

**R**_{1}*.*

**10ΩK**This value causes that the voltage divider Vref is not affected by * R_{BURDEN}*, being

*a much greater value, but in turn*

**R**_{1}*must be much smaller than the input impedance of the*

**R**_{1}*we use, in the case of Arduino recommend not exceed*

**ADC***impedance to avoid erroneous measurements.*

**10kΩ**To calculate the minimum power we have to ** consider the number of bits of the ADC** .