6-14 Chapter6
Front-Panel Key Reference
BW/Avg
BW/Avg
Activates the resolution bandwidth function and accesses the menu
keys that control the bandwidth functions and averaging.
Resolution BW
Auto Man
Changes the 3 dB resolution bandwidth on the analyzer from 1 kHz to
5 MHz in a 1, 3, 10 sequence using the knob or step keys. If an
unavailable bandwidth is entered using the numeric keypad, the closest
available bandwidth in the 1, 3, 10 sequence is used. (Option 1DR
provides additional 300 Hz, 100 Hz, 30 Hz and 10 Hz bandwidths.) As
the resolution bandwidth is decreased, the sweep time is increased to
maintain amplitude calibration. Resolution bandwidth is also related to
span. As span is decreased, the resolution bandwidth is decreased. As
the resolution bandwidth changes, the video bandwidth, if in auto
couple mode, changes to maintain the VBW/RBW ratio. A “#” mark
appears next to Res BW on the display when it is not coupled. To
recouple the resolution bandwidth, press
Resolution BW (Auto) (or press
Auto Couple). The resolution bandwidth can be changed using the step
keys, the knob, or the numeric keypad.
Video BW
Auto Man
Changes the analyzer post-detection filter from 30 Hz to 3 MHz in a 1,
3, 10 sequence using the knob or step keys. If an unavailable bandwidth
is entered using the numeric keypad, the closest available bandwidth in
the 1, 3, 10 sequence is used. (Option 1DR provides additional 1 Hz,
3 Hz and 10 Hz video bandwidths when the resolution bandwidth is
≤ 300 Hz.)
As the video bandwidth is decreased, the sweep time is increased to
maintain amplitude calibration. A “#” mark appears next to VBW on
the bottom of the analyzer display when it is not coupled. To couple the
video bandwidth, press
Video BW (Auto) (or press Auto Couple).
The video bandwidth can be changed by using the step keys, knob, or
numeric keypad.
VBW/RBW Ratio Selects the ratio between the video and resolution bandwidths. If signal
responses near the noise level are visually masked by the noise, the
ratio can be set to less than 1 to lower the noise. The knob and step keys
change the ratio in a 1, 3, 10 sequence. Pressing
Preset sets the ratio to
1.000 X. The ratio can be changed using the step keys, knob, or numeric
keypad.
Average On Off Turns the selected averaging function (video or power) on or off. The
detector is changed to sample when averaging is on. Pressing
Restart
resets the average trace and set the average count to 0.
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