The document details the THD (Total Harmonic Distortion) measurement capabilities of the THDPM-1 analyzer, which assesses voltage and current harmonics up to the 51st harmonic. Through various experiments with different loads (bulbs, CFLs, laptops, and LEDs), the document presents the resulting THD percentages, highlighting the variations caused by each load type. It emphasizes the impact of load characteristics on harmonic distortion, noting that linear loads tend to exhibit lower current distortion compared to non-linear loads.

1. Date-01/09/2014
By-
(THD MEASUREMENT WITH EXAMPLES AND FIGURES)
EMBUILT TECHNOLOGIES
www.embuilt.com
www.energylogger.blogspot.com
Embuilt.tech@gmail.com

2. Auxiliary Supply : 180 – 240 Volts
Input Voltage : 0 – 240 Volts
Current : 0 – 2.0 A*
(200mA,500mA range are also available)
Measures upto 51st Harmonic
Accuracy Class : 1%
Voltage Harmonics
Current Harmonics

3. THDPM-1 is THD analyzer which measures upto
51st 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 etc.

4. VOLTAGE
CURRENT
WATT
PF
VOLTAGE THD
CURRENT THD
NET THD
(Frequency and PF shows alternately )
Press to see Voltage Harmonics

5. Voltage
3rdHarmonic
5th Harmonic
7th Harmonic
Voltage rms Value
1st Harmonic
THD %
Press to see more Harmonics (Upto 51st harmonic can be seen)
Press to see Previous Harmonic
Press to see Current Harmonics

6. Current
3rd Harmonic
5th Harmonic
7th Harmonic
Current rms Value
1st Harmonic
Current THD %
Pres
s
to see more Harmonics
Press to see Previous Harmonic

9. 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 cause a small Distortion in current.

12. 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.

15. 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.

18. 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.

21. 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.

24. 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.

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

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