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DIY Digital Wattmeter with Calibration Against a Reference Meter

Approx. component budget: Rs. 4,000 - 7,000

Objective

Build a digital wattmeter and find its accuracy and error against a reference meter for resistive, inductive and electronic loads.

What you will build

A voltage sensor, a current sensor, an ADC and a microcontroller computing true RMS voltage, current, real power and power factor, with a display and a calibration routine.

Results you can expect

• Error % vs load for 5 loads
• Calibration factors
• Effect of non-sinusoidal current
• Uncertainty estimate
• Comparison with a commercial meter

What you will learn

Measurement of power, RMS calculation, calibration and uncertainty, core skills for a testing and quality laboratory.

Tools and notes

ESP32/Arduino with ADS1115, ZMPT101B and CT sensors, reference meter, Excel. Connects to mains, so use an enclosed, fused and isolated test box.

Resume points from this project

• Built and tested DIY Digital Wattmeter with Calibration Against a Reference Meter; objective: build a digital wattmeter and find its accuracy and error against a reference meter for resistive, inductive and electronic loads.
• Measured and analysed error % vs load for 5 loads and calibration factors; wrote the report and presented the results in a viva. Add your own numbers: [x].

Replace [x] with your own measured results. Write only what you really did.

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