Figure 1: Screen capture of a 10-s acquisition of AC input and PWM output of a 480-V motor drive |

## You need to test, we're here to help.

You need to test, we're here to help.

## 15 March 2018

### An Example of Three-Phase Power Measurements

## 14 March 2018

### Three-Phase Power Calculations

Figure 1: Three-phase power calculations entail summing of the individual phases's power calculations |

## 13 March 2018

### Power Calculations for Distorted Waveforms

Figure 1: The sum of many sine waves, of varying amplitudes and frequencies, comprises the rough- looking square wave shown in red |

## 09 March 2018

### Power Calculations for Pure Sine Waves

Figure 1: For a purely resistive load, power = voltage * current, with both vectors in phase |

### Back to Basics: AC Sinusoidal Line Current

Figure 1: A single-phase AC current vector rotates at 50 or 60 Hz |

## 02 March 2018

### More Basics of Three-Phase AC Sinusoidal Voltages

Figure 1: In the Wye three-phase connection, neutral is present but sometimes inaccessible |

## 01 March 2018

### Transmission Lines (Part V): Reverse-Engineering the DUT

Figure 1: Every DUT can be thought of as a Thevenin voltage source with some internal resistance |

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