Hi @M2Circuits, there’s no way currently to change the units to dBm. But you could fiddle with offsets and do it. Assume we’re talking about a 600 ohm system (recompute for whatever characteristic impedance you wish):
0 dBV = 1Vrms = 1.66 mW = 2.21 dBm
6 dBV = 2Vrms = 6.66 mW = 8.21 dBm
12 dBV = 4Vrms = 26.6 mW = 14.21 dBm
Note to go from 0 dBV into 600 ohms to dBm requires you to add 2.21 dB. And then, 6 dB more voltage yields 6 dB more power. And 12 dB more voltage yields 12 dB more power. So, if I add an external input gain of -2.21 dB in the plugin setup:
Then the resulting graph is as follows. Note that we output 0 dBV, but it’s measured as 2.21 dBV because of the offset we specified. So, that gives us the correct value.
And then I can change the Y axis title in the graph tool and I get:
So, with a little cheating you can get there.