5
.Menu Interpretation
37
5.5.3 [VBW Auto Man]
Sets the desired video bandwidth in order to remove the band
noise. Set the video resolution displays in function area, ranging
from 10Hz to 30MHz by sequence step. You can modify this
parameter by numeric key, step key or knob. The underline under
Auto or Manual means Auto mode or Manual mode. Press [VBW
Auto Manual] to have Auto underlined to return auto mode.
Key points:
Reducing the VBW to smooth the spectrum line and differentiate
small signals from the noise. However, this may cause a longer
sweep time. (Sweep Time is affected by a combination of RBW
and VBW when it is in Auto mode).
VBW varies with RBW when it is set to Auto.
5.5.4 [Average On Off]
Trace average function. It doesn’t need narrow VBW to implement
smooth trace. This function set the wave detector to acquisition
mode, continuously get average of the trace to smooth it.
5.5.5 [EMI Filter
►
]
Pop out the menu for EMI measurement bandwidth.
1) [
EMI Filter
On Off]
Turn on or off EMI measurement resolution bandwidth.
2) [
1MHz
]
Set EMI measurement resolution to 1MHz.
3) [
120kHz
]
Set EMI measurement resolution to 120kHz.
4) [
9kHz
]
Set EMI measurement resolution to 9kHz.
5) [
200Hz
]
Set EMI measurement resolution to 200Hz.
5.6
【
Marker
】
bottom softkey
Key access: [Marker] softkey at the bottom of the screen