Understanding function generator output when units are in dBm
I would expect at 1M ohm input impedance and with 0dbm, to get an ~.244 V amplitude, yet this is not the case.

At 0 dBm (1 milliWatt) into 50 ohms I would expect an amplitude of:

224 mVrms = 316 mVp = 632 mVpp.

However, you removed that 50 ohm load! So now you get double that voltage:

448 mVrms = 632 mVp = 1.267 Vpp

This schematic explains what happens:







simulate this circuit &ndash; Schematic created using CircuitLab