6 Functions Common to More Than One Operating Mode
Narda SRM-3006 71
6.2 Setting the resolution bandwidth (RBW)
Spectrum Analysis • RBW
Level Recorder • RBW
Scope • RBW
The resolution bandwidth (RBW) determines the characteristics of the
spectrum analyzer with regard to its ability to distinguish between signals
having the same amplitude. but different frequencies. Only signals having a
frequency spacing that is greater than the defined resolution bandwidth can
be distinguished from one another.
To set the resolution bandwidth:
1. Press the RBW softkey.
2. Use the rotary control to select the desired value and press the OK key.
ª The selected value is applied.
6.2.1 Setting the video bandwidth (VBW)
Spectrum Analysis • RBW • VBW
Level Recorder • RBW • VBW
Scope • RBW • VBW
Noisy signals can be smoothed by selecting a suitable video bandwidth.
There are two possible ways to make the setting:
• Off: The SRM-3006 will automatically select the correct VBW value.
• Manual selection
Background information:
The RBW selected for measuring signals having very close frequency
spacing must be correspondingly small. A larger resolution bandwidth
can be used for measuring wideband signals.
• The indicated level will be too low if the RBW is too small.
• Individual signals cannot be separated from one another if the RBW is
too big.
Example:
GSM frequency spacing / signal channel width = 200kHz,
RBW = 200 kHz.
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