Subscribing is a smart move!
You can subscribe to this board after you log in or create your free account.
Invite a Co-worker
Send a co-worker an invite to the portal.Just enter their email address and we'll connect them to register. After joining, they will belong to the same company.
Send Invite Cancel
Solved
Go to Solution
Accepted Solutions
Link copied. Please paste this link to share this article on your social media post.
The default shipping configuration for the Harmonic Measurement Modules is to show THD as a Percentage ratio of the measured rms harmonic distortion and the fundamental.
The "Percentages" option behaves the same as "Percent Fundamental" when the "Max Demand" input is left unlinked (as done by default on all modules). To prevent a divide-by-zero, this calculation is skipped and a 0 value returned when the fundamental (denominator) is below the "force level" (0.01% of FS on current and by default 0.02% of FS on voltage). Based on this, I suspect the theoretical upper bound is on the order of 1,000,000% when full scale harmonics and a very small non-zero fundamental are present.
The "Percent RMS" option effectively normalizes results to 100% (100% is the maximum possible value because the denominator includes all the harmonic signal)
Link copied. Please paste this link to share this article on your social media post.
Link copied. Please paste this link to share this article on your social media post.
The default shipping configuration for the Harmonic Measurement Modules is to show THD as a Percentage ratio of the measured rms harmonic distortion and the fundamental.
The "Percentages" option behaves the same as "Percent Fundamental" when the "Max Demand" input is left unlinked (as done by default on all modules). To prevent a divide-by-zero, this calculation is skipped and a 0 value returned when the fundamental (denominator) is below the "force level" (0.01% of FS on current and by default 0.02% of FS on voltage). Based on this, I suspect the theoretical upper bound is on the order of 1,000,000% when full scale harmonics and a very small non-zero fundamental are present.
The "Percent RMS" option effectively normalizes results to 100% (100% is the maximum possible value because the denominator includes all the harmonic signal)
Create your free account or log in to subscribe to the board - and gain access to more than 10,000+ support articles along with insights from experts and peers.