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I am learning to work with LTSpice. After I did my transient analysis, I established the .four command, but I don't know how to change the number of harmonics from the default which is 9 in LTSpice, any insights are appreciated. Thanks in advance.

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  • \$\begingroup\$ Have you thought of first consulting the most immediate resource available: the help? It's rather spartan, but I believe you'll find most of what you need in there. \$\endgroup\$ Apr 9, 2017 at 6:37

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.FOUR -- Compute a Fourier Component after a .TRAN Analysis

Syntax: .four <frequency> [Nharmonics] [Nperiods] <data trace1> [<data trace2> ...]

If we define [Nharmonics] ,then analysis includes that (Nharmonics) number of harmonics.

Example .four 1kHz 50 V(out) It will find THD with 50 harmonics.

Reference: http://ltwiki.org/index.php5?title=FOUR_dot_command

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