Did you actually run a harmonic balance (hb) analysis? The expression won't work if you did (and you would have to have simulated a lot of harmonics to get a graph as you showed). That looks more like a PSD/DFT plot from a transient simulation. As for returning to the calculator window once you've clicked on the node in the schematic - presumably it's just hidden behind the schematic window? For me it pops to the front once I've clicked on a net but it can dynamically change again as you move your cursor. Andrew
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