B&K Precision 2658A - Manual - Manual (Page 36)

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11.2 AUTO Mode
By pushing , the optimum RBW is set based on the frequency span and sweep time.
* When AUTO mode is set, “
*
” is displayed on the right end of RBW setting value display.
11.3 ALL AUTO Mode
By pushing , the optimum RBW, VBW and sweep time are set based on the frequency span.
* When ALL AUTO mode is set, “
*
” is displayed on the right end of each setting value display.
* When RBW is set to 3 kHz or 10 kHz, the selectivity at 60 dB becomes larger than an actual value due to SSB
phase noise.
12. Video Bandwidth <VBW>
When is pushed, the following function menu is displayed.
12.1 MANUAL Mode
By pushing or rotating , MANUAL mode is set.
By rotating , VBW is set as follows.
100Hz 300Hz 1kHz 3kHz 10kHz 30kHz
100kHz 300kHz 1MHz
12.2 AUTO Mode
By pushing , the optimum VBW is set based on the frequency span and sweep time.
When AUTO mode is set, “
*
” is displayed on the right end of VBW setting value display.
MANUAL
VBW
AUTO ALL AUTO
F1 F2 F3 F4 F5 F6
F2
F3
VBW
F1
F2