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After much pestering by users, I finally added an Analog S-meter to SDR Console. These will be available in 3.0.13, coming to a desktop near you soon.
A few weeks previously a reasonable logic was implemented for measuring the noise floor. Purists will not be happy, but they rarely are, but it works for me.
Take the output from the SDR radio, ignore 15% of the bandwidth at the high and low end of the output to avoid the ant-alias filtering, and we're left with a healthy 70% of the signal. Now sort the FFT bins by value, take the mean of the lowest 10% and that's the noise floor.
Starting with the standard digital metere:
Here are a few screenshots of the Analog S Meter.
First a tradition meter in S units.
Here's a dBm meter, same colours as above.
And here.s a Signal to Noise (SNR) meter.