From the manual - Spectrum Unit Conversion VI , we can select option of log/linear which will convert unit to dB or dBm. The conversion of dB or dBm should involve the impedance value. However, from the manual or function, it does not specific how much impedance this operation based on.
Spectrum Unit Conversion VI assumes 600 Ohm impedance when converting to dBm. If a different reference impedance is needed, please use the following code to make sure output spectrum always converted to dBm:
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