4-3 Making Spectrum Analyzer Measurements Chapter 4 — Spectrum Analyzer
4-4 MS20xxA VNA Master UG 10580-00166 Rev. C
Auto coupling of the VBW links the video bandwidth to the resolution bandwidth, so that the
wider the RBW, the wider the VBW. Auto coupling is indicated on the left side of the display
as
VBW XXX. If manual VBW coupling is selected, then a “#” symbol is shown in front of VBW
on the left side of the display, and the video bandwidth can be adjusted independently of the
RBW. If a nonexistent video bandwidth is entered, then the instrument will select the next
higher video bandwidth. If a value greater than the widest VBW is entered, then the widest
VBW will be selected.
The ratio of the resolution bandwidth to the video bandwidth can be changed by pressing the
BW key, the RBW/VBW soft key, and then using the keypad, the directional arrows, or the
rotary knob to set the ratio. The current value of the ratio is shown as part of the soft key
label.
10580-00166C.book Page 4 Thursday, February 21, 2008 12:52 PM
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