Hi,
DANL -155dBm with 100Hz RBW
20 dBm better than DSA815.
Best regards
egonotto
Perhaps due to the limited bandwidth?
I do not know how this is in this particular case in sales information but overall it need be careful when read.
It need know how some value is defined.
I do not know why manufactures very easy forget from salesmens advertisements this small Hz or example in some other cases they many times tell jitter rms when users still need live with jitter p-p and so on.
If example (Displayed) Average Noise Level ((D)ANL) is told as -150dBm/Hz it is clear.
But then reader need know that (if some conditional other things are true) if RBW is 10Hz, then really Displayed (visible) average noise level is 10dB higher. If RBW is 100Hz it is 20dB higher and if RBW is 1kHz then 30dB and so on.
Look here measured "D"ANL from DS800 data sheet. Nearly -160dBm/Hz
But of course it is not really Displayed. It is imagined DANL if RBW is 1Hz.
Real DANL what user see with his eyes on the screen is 20dB higher in this case. This is real DISPLAYED ANL in practice with this analyzator due to fact that RBW 100Hz is most narrow RBW what user can use.
If user select 1MHz RBW DANL is 60dB higher.
Older times many example HP specifications tell real DANL what user can see and not normalized to 1Hz Exept if there is also available 1Hz RBW.
If manufacturer have not defined it and value is on the advertisement it is mostly normalised value for 1Hz (because it looks more attractive)