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In another thread people were interested in how clean the AC output was from various generators as compared to utility power.
Below is a compilation of various AC power source waveforms and Total Harmonic Distortion (THD) calculation results.
Function generator set at 60 Hz. "Ideal" AC waveform.
![Function Generator.jpg Function Generator.jpg](https://www.steelsoldiers.com/data/attachments/659/659881-fe70a6c85d3bc192c374081a5f733401.jpg)
Utility Power - 2.4% THD
![Utility Power.jpg Utility Power.jpg](https://www.steelsoldiers.com/data/attachments/659/659887-4ec72fbe180af46867b14931df18adcc.jpg)
MEP-831A with factory Inverter. No Load- THD 1.1%
![831 Inverter.jpg 831 Inverter.jpg](https://www.steelsoldiers.com/data/attachments/659/659889-93e0f67957d70d9f0d762b2c6ca15b37.jpg)
MEP-831A with factory Inverter. 100% Load- THD 1.0%
![831 Inverter 3 Kw.jpg 831 Inverter 3 Kw.jpg](https://www.steelsoldiers.com/data/attachments/659/659955-a5a35f1ab26c0fb0c5ad98da652e0479.jpg)
802A No Load - THD 2.7%
![802.jpg 802.jpg](https://www.steelsoldiers.com/data/attachments/659/659891-d73ab52c12eddf9c114019410ec6db92.jpg)
802A - 3 KW Load - THD 3.5%
![802 3 Kw.jpg 802 3 Kw.jpg](https://www.steelsoldiers.com/data/attachments/659/659956-7745537f1f17462978cf08cdfa461dfd.jpg)
MEP-1030 No Load - THD 2.6%
![1030 Waveform.jpg 1030 Waveform.jpg](https://www.steelsoldiers.com/data/attachments/659/659893-978bce7cbe98df465da13932e48e8b26.jpg)
MEP-1030 3 KW Load - THD 3.0%
![1030 Waveform 3 Kw.jpg 1030 Waveform 3 Kw.jpg](https://www.steelsoldiers.com/data/attachments/659/659957-e14ab65fa11a2c7d09292738a71967f7.jpg)
MEP-831A with PMA & Inverter Swapped out and using a convention generator head in place of them.
No Load THD 4.1%
![831 Head Swap.jpg 831 Head Swap.jpg](https://www.steelsoldiers.com/data/attachments/659/659895-cb6e7351a95c48b1e2851b7ab8a5fef5.jpg)
MEP-831A with PMA & Inverter Swapped out and using a convention generator head in place of them.
Under full load. THD 11.9%
Strange as the waveform looks cleaner...
![831 Head Swap full load.jpg 831 Head Swap full load.jpg](https://www.steelsoldiers.com/data/attachments/659/659958-db15f62adb7acea63c98c8e667425956.jpg)
Below is a compilation of various AC power source waveforms and Total Harmonic Distortion (THD) calculation results.
Function generator set at 60 Hz. "Ideal" AC waveform.
![Function Generator.jpg Function Generator.jpg](https://www.steelsoldiers.com/data/attachments/659/659881-fe70a6c85d3bc192c374081a5f733401.jpg)
Utility Power - 2.4% THD
![Utility Power.jpg Utility Power.jpg](https://www.steelsoldiers.com/data/attachments/659/659887-4ec72fbe180af46867b14931df18adcc.jpg)
MEP-831A with factory Inverter. No Load- THD 1.1%
![831 Inverter.jpg 831 Inverter.jpg](https://www.steelsoldiers.com/data/attachments/659/659889-93e0f67957d70d9f0d762b2c6ca15b37.jpg)
MEP-831A with factory Inverter. 100% Load- THD 1.0%
![831 Inverter 3 Kw.jpg 831 Inverter 3 Kw.jpg](https://www.steelsoldiers.com/data/attachments/659/659955-a5a35f1ab26c0fb0c5ad98da652e0479.jpg)
802A No Load - THD 2.7%
![802.jpg 802.jpg](https://www.steelsoldiers.com/data/attachments/659/659891-d73ab52c12eddf9c114019410ec6db92.jpg)
802A - 3 KW Load - THD 3.5%
![802 3 Kw.jpg 802 3 Kw.jpg](https://www.steelsoldiers.com/data/attachments/659/659956-7745537f1f17462978cf08cdfa461dfd.jpg)
MEP-1030 No Load - THD 2.6%
![1030 Waveform.jpg 1030 Waveform.jpg](https://www.steelsoldiers.com/data/attachments/659/659893-978bce7cbe98df465da13932e48e8b26.jpg)
MEP-1030 3 KW Load - THD 3.0%
![1030 Waveform 3 Kw.jpg 1030 Waveform 3 Kw.jpg](https://www.steelsoldiers.com/data/attachments/659/659957-e14ab65fa11a2c7d09292738a71967f7.jpg)
MEP-831A with PMA & Inverter Swapped out and using a convention generator head in place of them.
No Load THD 4.1%
![831 Head Swap.jpg 831 Head Swap.jpg](https://www.steelsoldiers.com/data/attachments/659/659895-cb6e7351a95c48b1e2851b7ab8a5fef5.jpg)
MEP-831A with PMA & Inverter Swapped out and using a convention generator head in place of them.
Under full load. THD 11.9%
Strange as the waveform looks cleaner...
![831 Head Swap full load.jpg 831 Head Swap full load.jpg](https://www.steelsoldiers.com/data/attachments/659/659958-db15f62adb7acea63c98c8e667425956.jpg)
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