[Test-Equipment] Spectrum Analyzer BW measurement

[Larry Goodrich]

How will the rest of us benefit if the answer goes ONLY to you?  Larry W9HTK


At 12:17 PM 1/29/04 -0600, windy10605@juno.com wrote:
>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
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