[Test-Equipment] Spectrum Analyzer BW measurement

[windy10605@juno.com]

I'm trying to measure some 10-30Khz bandwidths. As I understand, the
correct method is to use the instrument's -3dB resolution BW (RBW) of
approx 1% ?? of what you are trying to measure. This means a RBW of
approx
0.1-0.3Khz. This instrument has and RBW of 5Hz, 50Hz, 500Hz, 5Khz, and
50Khz so I use 500Hz. If I use 5Khz the BW shown nearly doubles. I expect
it to get wider but why twice ?. And if it's twice, it seems like I'd get
widely variant BW measurements depending on if I'm able to select 500Hz,
1Khz or 3Khz or ? bandwidths. Or the BW would always have to be specified
with a RBW ...which begs the question "What do you do if the spec is at
3Khz RBW and the closest you can get is 500Hz and 5Khz ? Do you assume
the narrower RBW (500Hz) is more accurate anyway ?

Please send the resonse to me directly since I'm set to receive daily
summary notes.

73 Kees K5BCQ