Re: How to change Vrms to dBm?
- From: whit3rd <whit3rd@xxxxxxxxx>
- Date: Tue, 18 Mar 2008 20:31:27 -0700 (PDT)
On Mar 18, 2:10 am, ElectricQuadrup...@xxxxxxxxx wrote:
I have a power spectra in dB relative to 1Vrms / sqrt(Hz) and I want
to change units to dBm (dB power relative to 1mW). Signal was measured
at 1 kOhm load. How to change this units?
I think it depends on your 'dBm' definition. The usual definition
is mW into a 600 ohm load (this is an old telephone standard)
and you might want to worry about confusion with the old
moving-needle meters that converted V to dBm with that
different load (the AC scale on an old Simpson 260 VOM for
instance).
.
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- From: ElectricQuadrupole
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