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Spectrum Analyzer units of measure

Converting from dBm/Hz to V/√Hz

Written by Paul Cracknell

Updated at August 30th, 2024

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The Moku Spectrum Analyzer can display the spectrum amplitude in various units (dBm, Vrms, Vpp, and dBV).  Additionally,  you can select corresponding power spectral density (PSD) units (dBm/Hz, Vrms/√ Hz, Vpp/√Hz, and dBV/√ Hz).  It is worth noting that the Resolution Bandwidth (RBW) setting only affects the measurement in PSD units.

Below is an example from demo mode, where the channel 1 peak is shown at -68.68 dBm/Hz.


This can be converted to Vrms/√Hz by relationship P [mW/Hz] = 10 (P [dBm/Hz] / 10)

So in this case, P = 1.355 x 10 -7  mW/Hz

Also,  V= √( P x R) and that here 50 Ω is the conventional nominal impedance.  

Thus the spectral peak in volts, allowing for conversion from mW to W, is 

V = √( 50 x 1.35 x 10 -10)

V = 82.31 μV/√Hz

In this second screenshot of the Spectrum Analyzer in demo mode, the units have been switch to uV/√Hz.


moku:lab spectrum analyzer psd units dbm volts

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