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By- EMBUILT TECHNOLOGIES www.embuilt.com www.energylogger.blogspot.com Embuilt.tech@gmail.com (THD MEASUREMENT WITH EXAMPLES AND FIGURES) Date-03/09/2014

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Auxiliary Supply : 180 – 240 Volts Input Voltage : 3V – 300 Volts Current : 10mA – 2.0 A* (200mA,500mA,10A,20A range are also available) Frequency 45-55 Hz (45-65 Hz is also available) Measures upto 55th Harmonic Accuracy Class : 0.2% Voltage Harmonics Current Harmonics

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THDPM-1 is THD analyzer which measures upto 55 th harmonic. It provides Voltage and Current THD. It shows the net effect on THD due to load. It also shows following parameters- Voltage Current Watt Frequency Power Factor It is useful for testing of LED Drivers, SMPS, CFL, CHOKES, Charger, AC to DC Converter, UPS etc.

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VOLTAGE CURRENT WATT PF VOLTAGE THD CURRENT THD NET THD (Frequency and PF shows alternately ) Pressto see Voltage Harmonics

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3 rd Harmonic Voltage 5 th Harmonic 7th Harmonic Voltage rms Value 1 st Harmonic THD % Pressto see more Harmonics (upto 55 th harmonic can be seen) Pressto see Current Harmonics Pressto see Previous Harmonic

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3 rd Harmonic Current 5 th Harmonic 7 th Harmonic Current rms Value 1 st Harmonic Current THD % Pressto see more Harmonics (upto 55 th harmonic can be seen) Pressto see previous Harmonic Pressto see to go to main page

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Lets start testing with only Bulb load. We take a 100 Watt Bulb load and connect it to load side. Voltage THD is 2.90% and Current THD is 4.85%. So Bulb causes a small distortion in current.

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Experiment with only CFL load. We take a normal 14 Watt CFL and connect it to load side. Voltage THD is 3.56% and Current THD is 26.99%. A CFL distorts the current more.

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Experiment with Bulb and CFL load. Bulb specification is 100 Watt. CFL specification is 14W. Voltage THD is 3.23% and Current THD is 5.99%. Bulb has more power than CFL and also linear in nature so it tends to decrease the current distortion.

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Experiment with Bulb and Capacitor. We take a capacitor of 3.15µF and connect to load side with a normal Bulb load. Voltage THD is 3.12% and Current THD is 15.34%. A Capacitor also distorts the current.

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Experiment with Laptop load. We take a laptop and connect it to supply with charger of 65watt. Voltage THD is 7.92% and Current THD is 113.1%. AC to DC Converters provides high distortion in current.

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Experiment with Laptop and Bulb load. We Connect Bulb and Laptop at load side. Voltage THD is 8.83% and Current THD is 69.59%. A linear load reduces the current distortion. BULB has more power than Laptop Charger and also linear in nature so it tends to decrease the current distortion.

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Experiment with LED and LED Driver Load. We Connect 60 LEDs of 1Watt each at load side through LED Driver. Voltage THD is 1.68% and Current THD is 133.9%. LED Driver produces high distortion in current.

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Experiment with LED Bulb. We Connect LED Bulb at at load side. Voltage THD is 2.55% and Current THD is 63.40%. LED Driver produces distortion in current.

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Experiment with LED Bulb and normal Bulb load. We Connect LED Bulb and normal Bulb at load side. Voltage THD is 1.78% and Current THD is 7.02%. Bulb is linear device and has power more than LED Bulb so it reduces the Current distortion.

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