# \#rms

**URL:** https://forum.plexim.com/tag/rms/222.md

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## [What's the accuracy of the THD- and the RMS-Block? And how to adjust the fundamental during simulation?](https://forum.plexim.com/t/whats-the-accuracy-of-the-thd-and-the-rms-block-and-how-to-adjust-the-fundamental-during-simulation/1046)

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**Author:** [@dr00mprins](https://forum.plexim.com/u/dr00mprins)\
**Replies:** 5\
**Last updated:** [August 3, 2021, 12:07pm UTC](https://forum.plexim.com/t/whats-the-accuracy-of-the-thd-and-the-rms-block-and-how-to-adjust-the-fundamental-during-simulation/1046 "2021-08-03T12:07:50Z")

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Hi, To calculate the THD and the RMS value of a periodic signal I want to use both blocks in my model. How precise are these blocks? I mean till what order of harmonics they calculate the output-values? Does the simula…

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## [Continuous: Fourier Transform, RMS Value and THD](https://forum.plexim.com/t/continuous-fourier-transform-rms-value-and-thd/821)

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**Author:** [@Andrew](https://forum.plexim.com/u/Andrew)\
**Replies:** 1\
**Last updated:** [August 3, 2020, 1:26pm UTC](https://forum.plexim.com/t/continuous-fourier-transform-rms-value-and-thd/821 "2020-08-03T13:26:30Z")

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Hello, How can implement: \[b\]Continuous Fourier Transform\[/b\] \[b\]Continuous RMS Value\[/b\] \[b\]Continuous THD Value\[/b\] if I do not have PLECS 4.4. ??? Is there any posibility of doing that? Or I must have PLECS …

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## [RMS Function , how i can set the parameters?](https://forum.plexim.com/t/rms-function-how-i-can-set-the-parameters/314)

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**Author:** [@Ahmed\_Raafat](https://forum.plexim.com/u/Ahmed_Raafat)\
**Replies:** 1\
**Last updated:** [March 28, 2018, 12:27pm UTC](https://forum.plexim.com/t/rms-function-how-i-can-set-the-parameters/314 "2018-03-28T12:27:51Z")

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the RMS function of a pure sine wave must be like a strait line \>\>\> and when you get the di/dt for the RMS it must be = zero … but when i am useing the RMS block funtion the program ask about (sampling time , Number of …