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Like I keep telling you, the benefits of the narrow RBW apply to small continuous wave signals, eg a steady carrier that can sit inside the 10Hz RBW.

Noise isn't a continuous wave signal. So reducing the RBW offers no benefit when measuring noise power.

Yes it does that on mine too. But the fact you seem to be overlooking is that the noise you are trying to measure ALSO goes down 10dB so there is no 'net' benefit to the lower RBW when measuring the power of the NOISE.

The lower RBW can let you detect tiny cw signals better but if you want to measure the noise power from an amplifier you need to be able to measure 'noise' and NOT continuous wave signals.

The ability to measure low noise levels accurately is dictated by the analyser noise figure. You can't dodge this limitation by messing with lower RBW settings.

<blockquote data-quote="G0HZU" data-source="post: 411938" data-attributes="member: 19109">Like I keep telling you, the benefits of the narrow RBW apply to small continuous wave signals, eg a steady carrier that can sit inside the 10Hz RBW. Noise isn&#039;t a continuous wave signal. So reducing the RBW offers no benefit when measuring noise power. Yes it does that on mine too. But the fact you seem to be overlooking is that the noise you are trying to measure ALSO goes down 10dB so there is no &#039;net&#039; benefit to the lower RBW when measuring the power of the NOISE.The lower RBW can let you detect tiny cw signals better but if you want to measure the noise power from an amplifier you need to be able to measure &#039;noise&#039; and NOT continuous wave signals.The ability to measure low noise levels accurately is dictated by the analyser noise figure. You can&#039;t dodge this limitation by messing with lower RBW settings.</blockquote>

[QUOTE="G0HZU, post: 411938, member: 19109"] Like I keep telling you, the benefits of the narrow RBW apply to small continuous wave signals, eg a steady carrier that can sit inside the 10Hz RBW. Noise isn't a continuous wave signal. So reducing the RBW offers no benefit when measuring noise power. Yes it does that on mine too. But the [B]fact[/B] you seem to be overlooking is that the noise you are trying to measure ALSO goes down 10dB so there is no 'net' benefit to the lower RBW when measuring the power of the NOISE. The lower RBW can let you detect tiny cw signals better but if you want to measure the noise power from an amplifier you need to be able to measure 'noise' and NOT continuous wave signals. The ability to measure low noise levels accurately is dictated by the analyser noise figure. You can't dodge this limitation by messing with lower RBW settings. [/QUOTE]

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